diff --git a/backend/pinscopex/errata_check.py b/backend/pinscopex/errata_check.py
new file mode 100644
index 0000000..186d402
--- /dev/null
+++ b/backend/pinscopex/errata_check.py
@@ -0,0 +1,90 @@
+"""Errata workarounds from a known-URL catalog. No HTML scrape."""
+
+from __future__ import annotations
+
+import logging
+import re
+
+from backend.pinscopex.models import ComponentConstraints, DesignGraph, Finding
+from backend.pinscopex.passive_rail_check import (
+    _pin_name_tokens,
+    _resistor_to_power,
+)
+from backend.pinscopex.validate import _match_constraints
+
+log = logging.getLogger(__name__)
+
+# Exact MPN → URL + structured workarounds. Empty by default so eval is quiet.
+DEFAULT_ERRATA_CATALOG: dict[str, dict] = {}
+
+
+def check_errata(
+    graph: DesignGraph,
+    constraints_map: dict[str, ComponentConstraints] | None,
+    catalog: dict[str, dict] | None = None,
+) -> list[Finding]:
+    cmap = constraints_map or {}
+    cat = DEFAULT_ERRATA_CATALOG if catalog is None else catalog
+    findings: list[Finding] = []
+    for ref, comp in sorted(graph.components.items()):
+        mpn = (comp.mpn or "").strip()
+        if not mpn:
+            continue
+        entry = cat.get(mpn)
+        if entry is None:
+            continue
+        url = (entry.get("url") or "").strip()
+        if not url:
+            log.info("errata skip %s: catalog row has no url", mpn)
+            continue
+        cons = _match_constraints(mpn, cmap)
+        for wa in entry.get("workarounds") or []:
+            kind = (wa.get("kind") or "").lower()
+            pin_name = (wa.get("pin_name") or "").strip()
+            if kind != "pullup" or not pin_name:
+                continue
+            net = _net_for_pin_name(graph, ref, cons, pin_name)
+            if not net:
+                continue
+            if _resistor_to_power(graph, net):
+                continue
+            findings.append(Finding(
+                designator=ref,
+                mpn=mpn,
+                aspect="errata",
+                source="errata_check",
+                status="WARNING",
+                finding=(
+                    f"{ref} {pin_name} is missing the errata pull-up on '{net}'."
+                ),
+                why=wa.get("note") or "Vendor errata workaround is not on the schematic.",
+                recommendation="Add the pull-up described in the errata, or confirm the die revision.",
+                reference=url,
+                net=net,
+                pins=[f"{ref}.{pin_name}"],
+                rule_id="PS-ERRATA-001",
+            ))
+    return findings
+
+
+def _net_for_pin_name(
+    graph: DesignGraph,
+    ref: str,
+    cons: ComponentConstraints | None,
+    pin_name: str,
+) -> str | None:
+    comp = graph.components.get(ref)
+    if not comp:
+        return None
+    want = pin_name.upper()
+    for pin_num, net in comp.pins.items():
+        if (net or "").upper() == want:
+            return net
+        tokens = _pin_name_tokens(cons, pin_num)
+        if any(t.upper() == want or _token_match(t, pin_name) for t in tokens):
+            return net
+    return None
+
+
+def _token_match(token: str, pin_name: str) -> bool:
+    return bool(re.search(rf"(?:^|[_/]){re.escape(pin_name)}(?:$|[_/\d])", token, re.I))
diff --git a/backend/pinscopex/eval_report.py b/backend/pinscopex/eval_report.py
index 45909b7..aca873a 100644
--- a/backend/pinscopex/eval_report.py
+++ b/backend/pinscopex/eval_report.py
@@ -27,6 +27,9 @@ from backend.pinscopex.thermal_check import check_thermal
 from backend.pinscopex.power_margin_check import check_power_margin
 from backend.pinscopex.sequencing_check import check_power_sequencing
 from backend.pinscopex.dnp_check import check_dnp_enables
+from backend.pinscopex.lifecycle import check_lifecycle
+from backend.pinscopex.errata_check import check_errata
+from backend.pinscopex.internal_features_check import check_internal_features
 
 
 class EvalScores(BaseModel):
@@ -93,6 +96,9 @@ def run_deterministic_on_graph(graph: DesignGraph) -> list[Finding]:
     out.extend(check_power_margin(graph, cmap))
     out.extend(check_power_sequencing(graph, cmap))
     out.extend(check_dnp_enables(graph, cmap))
+    out.extend(check_lifecycle(graph, {}))
+    out.extend(check_errata(graph, cmap))
+    out.extend(check_internal_features(graph, cmap))
     return out
 
 
diff --git a/backend/pinscopex/internal_features_check.py b/backend/pinscopex/internal_features_check.py
new file mode 100644
index 0000000..d26318e
--- /dev/null
+++ b/backend/pinscopex/internal_features_check.py
@@ -0,0 +1,56 @@
+"""Open-drain / on-die pull-up pins from extracted internal_features."""
+
+from __future__ import annotations
+
+from backend.pinscopex.models import ComponentConstraints, DesignGraph, Finding
+from backend.pinscopex.passive_rail_check import (
+    _pin_name_tokens,
+    _resistor_to_power,
+)
+from backend.pinscopex.validate import _match_constraints
+
+
+def check_internal_features(
+    graph: DesignGraph,
+    constraints_map: dict[str, ComponentConstraints] | None = None,
+) -> list[Finding]:
+    cmap = constraints_map or {}
+    findings: list[Finding] = []
+    for ref, comp in sorted(graph.components.items()):
+        cons = _match_constraints(comp.mpn or comp.value, cmap)
+        feats = cons.internal_features if cons else None
+        if not feats or not feats.pullup_pins:
+            continue
+        for pin_name in feats.pullup_pins:
+            net = None
+            for pin_num, n in comp.pins.items():
+                tokens = _pin_name_tokens(cons, pin_num)
+                names = tokens or [n or "", str(pin_num)]
+                if any(
+                    t.upper() == pin_name.upper() or (n or "").upper() == pin_name.upper()
+                    for t in names
+                ):
+                    net = n
+                    break
+            if not net:
+                continue
+            if _resistor_to_power(graph, net):
+                continue
+            findings.append(Finding(
+                designator=ref,
+                mpn=comp.mpn or "",
+                aspect="internal_features",
+                source="internal_features_check",
+                status="WARNING",
+                finding=(
+                    f"{ref} {pin_name} is listed as needing an external pull-up "
+                    f"and net '{net}' has none."
+                ),
+                why="internal_features.pullup_pins from the datasheet block diagram.",
+                recommendation="Add a pull-up to the I/O rail, or confirm an on-die pull is enabled.",
+                reference="internal_features",
+                net=net,
+                pins=[f"{ref}.{pin_name}"],
+                rule_id="PS-INT-001",
+            ))
+    return findings
diff --git a/backend/pinscopex/layout_rules.py b/backend/pinscopex/layout_rules.py
new file mode 100644
index 0000000..bab4093
--- /dev/null
+++ b/backend/pinscopex/layout_rules.py
@@ -0,0 +1,60 @@
+"""Validate datasheet layout_rules. Distances stay null unless numeric."""
+
+from __future__ import annotations
+
+from typing import Any
+
+KNOWN_KINDS = frozenset({"decoupling_proximity", "thermal_via", "keepout"})
+
+
+def _num(v: Any) -> float | None:
+    if v is None or v is False:
+        return None
+    if isinstance(v, bool):
+        return None
+    if isinstance(v, (int, float)):
+        return float(v)
+    try:
+        return float(str(v).strip())
+    except (TypeError, ValueError):
+        return None
+
+
+def validate_layout_rules(raw: list | None) -> tuple[list[dict], list[str]]:
+    """Return (normalized rows, errors). Empty list is a valid skip."""
+    if not raw:
+        return [], []
+    if not isinstance(raw, list):
+        return [], ["layout_rules must be an array"]
+    ok: list[dict] = []
+    errors: list[str] = []
+    for i, row in enumerate(raw):
+        if not isinstance(row, dict):
+            errors.append(f"layout_rules[{i}] must be an object")
+            continue
+        kind = str(row.get("kind") or "").strip()
+        if kind not in KNOWN_KINDS:
+            errors.append(f"layout_rules[{i}] unknown kind {kind!r}")
+            continue
+        dist = _num(row.get("max_distance_mm"))
+        via = row.get("min_via_count")
+        via_i = None
+        if isinstance(via, int) and not isinstance(via, bool):
+            via_i = via
+        elif via is not None:
+            n = _num(via)
+            via_i = int(n) if n is not None else None
+        page = row.get("source_page")
+        page_i = int(page) if isinstance(page, int) else None
+        ok.append({
+            "kind": kind,
+            "pin": row.get("pin"),
+            "cap_value_hint": row.get("cap_value_hint"),
+            "max_distance_mm": dist,
+            "same_layer": row.get("same_layer") if isinstance(row.get("same_layer"), bool) else None,
+            "min_via_count": via_i,
+            "net_class": row.get("net_class"),
+            "note": row.get("note"),
+            "source_page": page_i,
+        })
+    return ok, errors
diff --git a/backend/pinscopex/lifecycle.py b/backend/pinscopex/lifecycle.py
new file mode 100644
index 0000000..783f5f6
--- /dev/null
+++ b/backend/pinscopex/lifecycle.py
@@ -0,0 +1,221 @@
+"""Distributor lifecycle / RoHS — cached records only, never a guessed equivalent."""
+
+from __future__ import annotations
+
+import json
+import re
+from pathlib import Path
+
+from pydantic import BaseModel
+
+from backend.pinscopex.models import ComponentType, DesignGraph, Finding
+from backend.pinscopex.utils import safe_mpn
+
+_EOL = re.compile(
+    r"\b(obsolete|eol|end\s*of\s*life|discontinued|last\s*time\s*buy|ltb)\b",
+    re.I,
+)
+_NRND = re.compile(
+    r"\b(nrnd|not\s+for\s+new\s+designs|not\s+recommended)\b",
+    re.I,
+)
+_ACTIVE = re.compile(r"\b(active|production|recommended)\b", re.I)
+_ROHS_NO = re.compile(r"\b(non[-\s]?compliant|not\s+compliant|no)\b", re.I)
+_ROHS_YES = re.compile(r"\b(rohs\s*\d*\s*compliant|compliant|yes|true)\b", re.I)
+_ROHS_NA = re.compile(r"\b(not\s+applicable|n/?a|exempt)\b", re.I)
+
+
+class LifecycleRecord(BaseModel):
+    mpn: str
+    source: str = ""
+    lifecycle: str | None = None  # active | nrnd | eol | unknown
+    rohs_compliant: bool | None = None
+    stock: int | None = None
+    lead_time: str | None = None
+    replacement: str | None = None
+    product_status_raw: str = ""
+
+
+def _status_lifecycle(raw: str) -> str | None:
+    s = (raw or "").strip()
+    if not s:
+        return None
+    if _EOL.search(s):
+        return "eol"
+    if _NRND.search(s):
+        return "nrnd"
+    if _ACTIVE.search(s):
+        return "active"
+    return "unknown"
+
+
+def _rohs(raw: str) -> bool | None:
+    s = (raw or "").strip()
+    if not s:
+        return None
+    if _ROHS_NA.search(s):
+        return None
+    if _ROHS_NO.search(s):
+        return False
+    if _ROHS_YES.search(s):
+        return True
+    return None
+
+
+def _replacement(product: dict) -> str | None:
+    for key in ("ProductSubstitutions", "Substitutes", "replacement", "Replacement"):
+        val = product.get(key)
+        if not val:
+            continue
+        if isinstance(val, str) and val.strip():
+            return val.strip()
+        if isinstance(val, list) and val:
+            first = val[0]
+            if isinstance(first, str) and first.strip():
+                return first.strip()
+            if isinstance(first, dict):
+                for k in ("ManufacturerProductNumber", "ManufacturerPartNumber", "mpn"):
+                    if first.get(k):
+                        return str(first[k]).strip()
+    return None
+
+
+def parse_distributor_product(mpn: str, product: dict, *, source: str = "digikey") -> LifecycleRecord:
+    """Map a DigiKey/Mouser/LCSC product dict. Unknown fields stay None."""
+    status = (
+        product.get("ProductStatus")
+        or product.get("productStatus")
+        or product.get("partLifeCycle")
+        or product.get("LifecycleStatus")
+        or ""
+    )
+    rohs_raw = (
+        product.get("RoHSStatus")
+        or product.get("rohsStatus")
+        or product.get("rohs")
+        or ""
+    )
+    if isinstance(rohs_raw, bool):
+        rohs = rohs_raw
+        rohs_raw = "true" if rohs_raw else "false"
+    else:
+        rohs = _rohs(str(rohs_raw))
+    stock = product.get("QuantityAvailable")
+    if stock is None:
+        stock = product.get("stock")
+    try:
+        stock_i = int(stock) if stock is not None else None
+    except (TypeError, ValueError):
+        stock_i = None
+    lead = product.get("ManufacturerLeadWeeks") or product.get("lead_time") or product.get("LeadTime")
+    return LifecycleRecord(
+        mpn=mpn,
+        source=source,
+        lifecycle=_status_lifecycle(str(status)),
+        rohs_compliant=rohs,
+        stock=stock_i,
+        lead_time=str(lead) if lead not in (None, "") else None,
+        replacement=_replacement(product),
+        product_status_raw=str(status),
+    )
+
+
+def load_lifecycle_dir(directory: str | Path) -> dict[str, LifecycleRecord]:
+    out: dict[str, LifecycleRecord] = {}
+    path = Path(directory)
+    if not path.is_dir():
+        return out
+    for f in path.glob("*.json"):
+        raw = json.loads(f.read_text())
+        rec = LifecycleRecord.model_validate(raw)
+        out[rec.mpn] = rec
+    return out
+
+
+def write_lifecycle_record(directory: str | Path, rec: LifecycleRecord) -> Path:
+    path = Path(directory)
+    path.mkdir(parents=True, exist_ok=True)
+    dest = path / f"{safe_mpn(rec.mpn)}.json"
+    dest.write_text(rec.model_dump_json(indent=2) + "\n")
+    return dest
+
+
+def _match_record(mpn: str | None, records: dict[str, LifecycleRecord]) -> LifecycleRecord | None:
+    if not mpn:
+        return None
+    if mpn in records:
+        return records[mpn]
+    norm = re.sub(r"[/_\-\s]", "", mpn).upper()
+    for key, rec in records.items():
+        if re.sub(r"[/_\-\s]", "", key).upper() == norm:
+            return rec
+    return None
+
+
+def check_lifecycle(
+    graph: DesignGraph,
+    records: dict[str, LifecycleRecord] | None,
+) -> list[Finding]:
+    recs = records or {}
+    findings: list[Finding] = []
+    seen: set[str] = set()
+    for ref, comp in sorted(graph.components.items()):
+        if comp.component_type in (
+            ComponentType.MECHANICAL, ComponentType.FIDUCIAL, ComponentType.TEST_POINT,
+        ):
+            continue
+        mpn = (comp.mpn or "").strip()
+        rec = _match_record(mpn, recs)
+        if rec is None:
+            continue
+        if mpn in seen:
+            continue
+        seen.add(mpn)
+        if rec.lifecycle == "eol":
+            rec_txt = (
+                f"Distributor replacement: {rec.replacement}."
+                if rec.replacement else
+                "No distributor replacement was listed."
+            )
+            findings.append(Finding(
+                designator=ref,
+                mpn=mpn,
+                aspect="lifecycle",
+                source="lifecycle_check",
+                status="WARNING",
+                finding=f"{mpn} is EOL/obsolete ({rec.product_status_raw or 'eol'}).",
+                why="Distributor ProductStatus, not an LLM equivalent search.",
+                recommendation=rec_txt,
+                reference=rec.source or "distributor",
+                pins=[ref],
+                rule_id="PS-LF-001",
+            ))
+        elif rec.lifecycle == "nrnd":
+            findings.append(Finding(
+                designator=ref,
+                mpn=mpn,
+                aspect="lifecycle",
+                source="lifecycle_check",
+                status="INFO",
+                finding=f"{mpn} is NRND ({rec.product_status_raw or 'nrnd'}).",
+                why="Distributor ProductStatus.",
+                recommendation="Prefer an Active orderable if the design is new.",
+                reference=rec.source or "distributor",
+                pins=[ref],
+                rule_id="PS-LF-002",
+            ))
+        if rec.rohs_compliant is False:
+            findings.append(Finding(
+                designator=ref,
+                mpn=mpn,
+                aspect="lifecycle",
+                source="lifecycle_check",
+                status="WARNING",
+                finding=f"{mpn} is marked RoHS non-compliant.",
+                why="RoHS fail only when the distributor flag is explicit.",
+                recommendation="Choose a RoHS-compliant orderable of the same MPN family.",
+                reference=rec.source or "distributor",
+                pins=[ref],
+                rule_id="PS-LF-003",
+            ))
+    return findings
diff --git a/backend/pinscopex/models.py b/backend/pinscopex/models.py
index 0f7c83c..a665618 100644
--- a/backend/pinscopex/models.py
+++ b/backend/pinscopex/models.py
@@ -44,6 +44,13 @@ def _check_subtype(v: object) -> str | None:
     return validate_subtype(str(v))
 
 
+class InternalFeatures(BaseModel):
+    """Block-diagram extras: ESD clamps, on-die pull-ups, analog switches."""
+    esd_clamp_pins: list[str] = []
+    pullup_pins: list[str] = []
+    analog_switch: list[str] = []
+
+
 class ComponentConstraints(BaseModel):
     mpn: str
     model_version: str = "1.0.0"  # semver; bumped on prune (patch) or skill update (minor)
@@ -52,6 +59,8 @@ class ComponentConstraints(BaseModel):
     pintable: list[Pin]
     absolute_maximum_ratings: list[AbsMaxRating]
     rules: list[Rule]
+    internal_features: InternalFeatures | None = None
+    layout_rules: list[dict] = []
 
     _validate_subtype = field_validator("component_subtype", mode="before")(
         staticmethod(_check_subtype)
diff --git a/backend/services/extraction.py b/backend/services/extraction.py
index df5c751..1bb9cd3 100644
--- a/backend/services/extraction.py
+++ b/backend/services/extraction.py
@@ -125,6 +125,20 @@ PINTABLE_TOOL = {
                     "required": ["parameter", "unit", "source_page"],
                 },
             },
+            "internal_features": {
+                "type": "object",
+                "description": "Optional block-diagram extras. Omit or empty if not shown.",
+                "properties": {
+                    "esd_clamp_pins": {"type": "array", "items": {"type": "string"}},
+                    "pullup_pins": {"type": "array", "items": {"type": "string"}},
+                    "analog_switch": {"type": "array", "items": {"type": "string"}},
+                },
+            },
+            "layout_rules": {
+                "type": "array",
+                "description": "Optional PCB layout constraints from typical-application pages. kind must be decoupling_proximity, thermal_via, or keepout. max_distance_mm only if the PDF states a number.",
+                "items": {"type": "object"},
+            },
         },
         "required": ["component_subtype", "component_subtype_description", "package_info", "pintable"],
     },
@@ -351,6 +365,25 @@ def _coerce_abs_max(raw: object) -> list[dict]:
     return out
 
 
+def _coerce_layout_rules(raw: object) -> list[dict]:
+    from backend.pinscopex.layout_rules import validate_layout_rules
+    rows, _errors = validate_layout_rules(raw if isinstance(raw, list) else [])
+    return rows
+
+
+def _coerce_internal_features(raw: object):
+    from backend.pinscopex.models import InternalFeatures
+    if not isinstance(raw, dict):
+        return None
+    try:
+        feat = InternalFeatures.model_validate(raw)
+    except Exception:
+        return None
+    if not feat.esd_clamp_pins and not feat.pullup_pins and not feat.analog_switch:
+        return None
+    return feat
+
+
 _GENERATE_SPECS_TOOL = {
     "name": "save_specs_schema",
     "description": "Save the standardized parameter schema for a component type.",
@@ -623,6 +656,8 @@ async def extract_pintable(
             result.get("absolute_maximum_ratings") or [],
         ),
         rules=[],
+        internal_features=_coerce_internal_features(result.get("internal_features")),
+        layout_rules=_coerce_layout_rules(result.get("layout_rules")),
     )
 
     output_dir.mkdir(parents=True, exist_ok=True)
diff --git a/backend/services/llm/pdf_ingest.py b/backend/services/llm/pdf_ingest.py
index 2165427..52766ab 100644
--- a/backend/services/llm/pdf_ingest.py
+++ b/backend/services/llm/pdf_ingest.py
@@ -35,6 +35,8 @@ _PAGE_KEYWORDS = re.compile(
     r"|power\s+supply|thermal\s+(resistance|shutdown|pad)|ESD\s+(rating|tolerance)"
     r"|decoupling|bypass\s+capacitor|typical\s+application"
     r"|application\s+(circuit|schematic|information|note)|reference\s+design"
+    r"|block\s+diagram|functional\s+block|internal\s+block"
+    r"|pcb\s+layout|layout\s+consideration|thermal\s+via"
     r"|ordering\s+information|device\s+information",
     re.IGNORECASE,
 )
diff --git a/backend/services/validation.py b/backend/services/validation.py
index ae2c76a..3c39418 100644
--- a/backend/services/validation.py
+++ b/backend/services/validation.py
@@ -57,6 +57,9 @@ from backend.pinscopex.thermal_check import check_thermal
 from backend.pinscopex.power_margin_check import check_power_margin
 from backend.pinscopex.sequencing_check import check_power_sequencing
 from backend.pinscopex.dnp_check import check_dnp_enables
+from backend.pinscopex.lifecycle import check_lifecycle, load_lifecycle_dir
+from backend.pinscopex.errata_check import check_errata
+from backend.pinscopex.internal_features_check import check_internal_features
 
 TRACE_VERSION = 1
 
@@ -67,7 +70,8 @@ def _is_deterministic(f: Finding) -> bool:
 
 
 def _run_deterministic_checks(
-    graph: DesignGraph, constraints_map: dict
+    graph: DesignGraph, constraints_map: dict,
+    lifecycle_map: dict | None = None,
 ) -> list[Finding]:
     """Run the deterministic graph checks, fail-soft per check — a check bug
     can never break the review or the report."""
@@ -87,6 +91,9 @@ def _run_deterministic_checks(
         ("power_margin_check", lambda: check_power_margin(graph, constraints_map)),
         ("sequencing_check", lambda: check_power_sequencing(graph, constraints_map)),
         ("dnp_check", lambda: check_dnp_enables(graph, constraints_map)),
+        ("lifecycle_check", lambda: check_lifecycle(graph, lifecycle_map)),
+        ("errata_check", lambda: check_errata(graph, constraints_map)),
+        ("internal_features_check", lambda: check_internal_features(graph, constraints_map)),
     ):
         try:
             out.extend(fn())
@@ -693,10 +700,17 @@ async def validate_design_async(
     graph = DesignGraph.model_validate(raw)
     datasheets = _load_datasheets(datasheets_dir)
     constraints_map = _build_constraints_map(datasheets)
-
-    # Deterministic graph checks (pin-mux feasibility, LED current). Pure
-    # functions of the graph; fail-soft. Seeded into all_findings below.
-    deterministic_findings = _run_deterministic_checks(graph, constraints_map)
+    lifecycle_map = {}
+    for cand in (
+        Path(datasheets_dir).parent / "lifecycle",
+        Path(datasheets_dir) / "lifecycle",
+    ):
+        loaded = load_lifecycle_dir(cand)
+        if loaded:
+            lifecycle_map.update(loaded)
+    deterministic_findings = _run_deterministic_checks(
+        graph, constraints_map, lifecycle_map,
+    )
 
     pdf_dir_path = Path(pdf_dir)
 
diff --git a/frontend/content/changelog.md b/frontend/content/changelog.md
index f2f5879..5fe0a76 100644
--- a/frontend/content/changelog.md
+++ b/frontend/content/changelog.md
@@ -2,6 +2,15 @@
 
 What's new in Pinscope.
 
+## 2.17.0 — 2026-09-10 — Lifecycle and datasheet extras
+
+Distributor lifecycle is a cached check, not a review scrape. Errata and layout_rules stay structured and skip when the catalog or the PDF has no number.
+
+- [New] `PS-LF-001` EOL, `PS-LF-002` NRND, `PS-LF-003` explicit RoHS fail. Replacement only if the distributor lists it. Active / RoHS N/A / missing cache row are silent.
+- [New] `PS-ERRATA-001` when a catalogued workaround pull-up is missing. No URL → skip.
+- [New] `PS-INT-001` when `internal_features.pullup_pins` has no rail resistor.
+- [New] `layout_rules` closed kinds; non-numeric `max_distance_mm` is stored as null.
+
 ## 2.16.0 — 2026-09-10 — KiCad cad-bridge
 
 Pinscope writes `pinscope-findings.json` next to the report so a KiCad 9/10 action plugin can pan to the symbol uuid on the right sheet.
diff --git a/skills/extract-pintable/SKILL.md b/skills/extract-pintable/SKILL.md
index 8d5939f..a932dfc 100644
--- a/skills/extract-pintable/SKILL.md
+++ b/skills/extract-pintable/SKILL.md
@@ -28,6 +28,12 @@ Rules for pin extraction:
 - Include ALL pins — power, ground, NC, and signal pins
 - Use pin names verbatim from the datasheet — do not rename or normalize
 - For multiplexed pins, put the primary name in `name` and alternates in `functions`
+
+Optional extras (omit if the PDF does not show them):
+- `internal_features.pullup_pins` / `esd_clamp_pins` / `analog_switch` from the **block diagram** only.
+- `layout_rules` from **PCB layout / typical application** pages. `kind` is only `decoupling_proximity`, `thermal_via`, or `keepout`. Set `max_distance_mm` only when the document states a number — do not invent JEDEC millimetres.
+
+Rules for pin extraction:`
 - If the datasheet has separate tables for different packages, extract for the package matching the MPN
 - Pay careful attention to pin numbering — off-by-one errors here break everything downstream
 - **Modules vs bare die (critical).** MPNs containing `WROOM`, `WROVER`, `MODULE`, `MOD-`, or `SIP` are *modules*. Extract the **module landing-pad table** (connector pins the schematic uses). Do **not** extract the SoC/QFN ball map from a nested chip chapter or a sibling chip-only PDF.
diff --git a/skills/extract-pintable/schema.json b/skills/extract-pintable/schema.json
index 2173af8..9c338c3 100644
--- a/skills/extract-pintable/schema.json
+++ b/skills/extract-pintable/schema.json
@@ -45,6 +45,18 @@
         },
         "required": ["parameter", "unit", "source_page"]
       }
+    },
+    "internal_features": {
+      "type": "object",
+      "properties": {
+        "esd_clamp_pins": {"type": "array", "items": {"type": "string"}},
+        "pullup_pins": {"type": "array", "items": {"type": "string"}},
+        "analog_switch": {"type": "array", "items": {"type": "string"}}
+      }
+    },
+    "layout_rules": {
+      "type": "array",
+      "items": {"type": "object"}
     }
   },
   "required": ["component_subtype", "package_info", "pintable"]
diff --git a/skills/extract-pintable/validate.py b/skills/extract-pintable/validate.py
index 7d1f186..c0532bc 100644
--- a/skills/extract-pintable/validate.py
+++ b/skills/extract-pintable/validate.py
@@ -81,6 +81,19 @@ def validate(data: dict) -> list[str]:
                             f"absolute_maximum_ratings[{i}] missing required field: {f}"
                         )
 
+    if "layout_rules" in data and data["layout_rules"] is not None:
+        if not isinstance(data["layout_rules"], list):
+            errors.append("layout_rules must be an array")
+        else:
+            kinds = {"decoupling_proximity", "thermal_via", "keepout"}
+            for i, row in enumerate(data["layout_rules"]):
+                if not isinstance(row, dict):
+                    errors.append(f"layout_rules[{i}] must be an object")
+                    continue
+                kind = row.get("kind")
+                if kind not in kinds:
+                    errors.append(f"layout_rules[{i}] unknown kind: {kind!r}")
+
     return errors
 
 
diff --git a/tests/test_errata_check.py b/tests/test_errata_check.py
new file mode 100644
index 0000000..1cf4892
--- /dev/null
+++ b/tests/test_errata_check.py
@@ -0,0 +1,94 @@
+"""Errata catalog — workaround on the graph, no scraping.
+
+Favor: known MPN with a pull-up workaround missing on the net → PS-ERRATA-001.
+Against: MPN not in catalog is silent (even TI-looking); workaround pull-up
+present is silent; catalog entry without url is skipped.
+"""
+
+from __future__ import annotations
+
+from backend.pinscopex.errata_check import check_errata
+from backend.pinscopex.models import (
+    Component,
+    ComponentConstraints,
+    ComponentType,
+    DesignGraph,
+    Net,
+    NetType,
+    Pin,
+    PinConnection,
+    ResistorSpecs,
+)
+
+
+def _cons():
+    return {
+        "ERRX": ComponentConstraints(
+            mpn="ERRX",
+            pintable=[Pin(number=1, name="NRST"), Pin(number=2, name="GND")],
+            absolute_maximum_ratings=[], rules=[],
+        )
+    }
+
+
+def _graph(with_pull: bool):
+    u = Component(
+        reference="U1", value="", footprint="",
+        component_type=ComponentType.IC, mpn="ERRX",
+        pins={"1": "NRST", "2": "GND"},
+    )
+    comps = {"U1": u}
+    nets = {
+        "NRST": (NetType.SIGNAL, [("U1", "1")]),
+        "GND": (NetType.GROUND, [("U1", "2")]),
+        "3V3": (NetType.POWER, []),
+    }
+    if with_pull:
+        r = Component(
+            reference="R1", value="10k", footprint="",
+            component_type=ComponentType.RESISTOR, mpn="R1",
+            pins={"1": "NRST", "2": "3V3"},
+            specs=ResistorSpecs(value_ohms=10000, value_formatted="10k"),
+        )
+        comps["R1"] = r
+        nets["NRST"] = (NetType.SIGNAL, [("U1", "1"), ("R1", "1")])
+        nets["3V3"] = (NetType.POWER, [("R1", "2")])
+    net_objs = {
+        name: Net(
+            name=name, net_type=ntype,
+            pins=[PinConnection(component_ref=r, pin_number=str(p)) for r, p in conns],
+        )
+        for name, (ntype, conns) in nets.items()
+    }
+    return DesignGraph(components=comps, nets=net_objs)
+
+
+CATALOG = {
+    "ERRX": {
+        "url": "https://www.ti.com/lit/er/fixture",
+        "workarounds": [
+            {"kind": "pullup", "pin_name": "NRST", "note": "10 kΩ to VDD per errata"},
+        ],
+    }
+}
+
+
+def test_missing_errata_pullup_is_ps_errata_001():
+    findings = check_errata(_graph(False), _cons(), CATALOG)
+    assert len(findings) == 1
+    assert findings[0].rule_id == "PS-ERRATA-001"
+    assert findings[0].status == "WARNING"
+    assert findings[0].source == "errata_check"
+    assert "ti.com/lit/er" in findings[0].reference
+
+
+def test_pullup_present_is_silent():
+    assert check_errata(_graph(True), _cons(), CATALOG) == []
+
+
+def test_unknown_mpn_and_url_less_entry_are_silent():
+    g = _graph(False)
+    g.components["U1"].mpn = "UNKNOWNPART"
+    assert check_errata(g, _cons(), CATALOG) == []
+    no_url = {"ERRX": {"url": "", "workarounds": [{"kind": "pullup", "pin_name": "NRST"}]}}
+    assert check_errata(_graph(False), _cons(), no_url) == []
diff --git a/tests/test_internal_features_check.py b/tests/test_internal_features_check.py
new file mode 100644
index 0000000..a68e763
--- /dev/null
+++ b/tests/test_internal_features_check.py
@@ -0,0 +1,83 @@
+"""Internal features (block-diagram extraction) — open-drain pull-up.
+
+Favor: pin listed in pullup_pins with no resistor to a rail → PS-INT-001.
+Against: empty internal_features is silent; listed pin with a pull-up is
+silent; a pin not in pullup_pins is not guessed as open-drain.
+"""
+
+from __future__ import annotations
+
+from backend.pinscopex.internal_features_check import check_internal_features
+from backend.pinscopex.models import (
+    Component,
+    ComponentConstraints,
+    ComponentType,
+    DesignGraph,
+    InternalFeatures,
+    Net,
+    NetType,
+    Pin,
+    PinConnection,
+    ResistorSpecs,
+)
+
+
+def _graph(with_pull: bool):
+    u = Component(
+        reference="U1", value="", footprint="",
+        component_type=ComponentType.IC, mpn="UTEST",
+        pins={"1": "SDA", "2": "GND"},
+    )
+    comps = {"U1": u}
+    nets = {
+        "SDA": (NetType.SIGNAL, [("U1", "1")]),
+        "GND": (NetType.GROUND, [("U1", "2")]),
+        "3V3": (NetType.POWER, []),
+    }
+    if with_pull:
+        r = Component(
+            reference="R1", value="4k7", footprint="",
+            component_type=ComponentType.RESISTOR, mpn="R1",
+            pins={"1": "SDA", "2": "3V3"},
+            specs=ResistorSpecs(value_ohms=4700, value_formatted="4k7"),
+        )
+        comps["R1"] = r
+        nets["SDA"] = (NetType.SIGNAL, [("U1", "1"), ("R1", "1")])
+        nets["3V3"] = (NetType.POWER, [("R1", "2")])
+    net_objs = {
+        name: Net(
+            name=name, net_type=ntype,
+            pins=[PinConnection(component_ref=a, pin_number=str(b)) for a, b in conns],
+        )
+        for name, (ntype, conns) in nets.items()
+    }
+    return DesignGraph(components=comps, nets=net_objs)
+
+
+def _cons(features: InternalFeatures | None):
+    return {
+        "UTEST": ComponentConstraints(
+            mpn="UTEST",
+            pintable=[Pin(number=1, name="SDA"), Pin(number=2, name="GND")],
+            absolute_maximum_ratings=[], rules=[],
+            internal_features=features,
+        )
+    }
+
+
+def test_listed_open_drain_without_pull_is_warning():
+    feats = InternalFeatures(pullup_pins=["SDA"])
+    findings = check_internal_features(_graph(False), _cons(feats))
+    assert len(findings) == 1
+    assert findings[0].rule_id == "PS-INT-001"
+    assert findings[0].status == "WARNING"
+
+
+def test_listed_pin_with_pullup_is_silent():
+    feats = InternalFeatures(pullup_pins=["SDA"])
+    assert check_internal_features(_graph(True), _cons(feats)) == []
+
+
+def test_empty_features_does_not_guess_open_drain():
+    assert check_internal_features(_graph(False), _cons(None)) == []
+    assert check_internal_features(_graph(False), _cons(InternalFeatures())) == []
diff --git a/tests/test_layout_rules.py b/tests/test_layout_rules.py
new file mode 100644
index 0000000..e03faa1
--- /dev/null
+++ b/tests/test_layout_rules.py
@@ -0,0 +1,54 @@
+"""layout_rules from datasheet — closed kind enum, no invented millimetres.
+
+Favor: decoupling_proximity with a numeric max_distance_mm and source_page;
+empty list is valid (explicit skip).
+Against: unknown kind is rejected; a non-numeric distance becomes null
+(not a guessed JEDEC 3 mm); thermal_via without min_via_count is kept
+but distance stays unset.
+"""
+
+from __future__ import annotations
+
+from backend.pinscopex.layout_rules import validate_layout_rules
+
+
+def test_valid_decoupling_proximity_keeps_distance():
+    ok, errors = validate_layout_rules([
+        {
+            "kind": "decoupling_proximity",
+            "pin": "VDD",
+            "cap_value_hint": "100nF",
+            "max_distance_mm": 2.0,
+            "same_layer": True,
+            "source_page": 14,
+        }
+    ])
+    assert errors == []
+    assert len(ok) == 1
+    assert ok[0]["max_distance_mm"] == 2.0
+    assert ok[0]["kind"] == "decoupling_proximity"
+
+
+def test_empty_list_is_explicit_skip():
+    ok, errors = validate_layout_rules([])
+    assert ok == []
+    assert errors == []
+
+
+def test_unknown_kind_rejected_and_bad_distance_not_invented():
+    ok, errors = validate_layout_rules([
+        {"kind": "jedec_land_pattern", "max_distance_mm": 3.0},
+        {
+            "kind": "decoupling_proximity",
+            "pin": "VDD",
+            "max_distance_mm": "close",
+            "source_page": 2,
+        },
+        {"kind": "thermal_via", "pin": "EP", "min_via_count": 4},
+    ])
+    assert any("kind" in e.lower() or "jedec" in e.lower() for e in errors)
+    dist_rows = [r for r in ok if r["kind"] == "decoupling_proximity"]
+    assert len(dist_rows) == 1
+    assert dist_rows[0]["max_distance_mm"] is None
+    via = [r for r in ok if r["kind"] == "thermal_via"]
+    assert len(via) == 1 and via[0]["min_via_count"] == 4
diff --git a/tests/test_lifecycle_check.py b/tests/test_lifecycle_check.py
new file mode 100644
index 0000000..f60bada
--- /dev/null
+++ b/tests/test_lifecycle_check.py
@@ -0,0 +1,98 @@
+"""Lifecycle from distributor payload.
+
+Favor: DigiKey Obsolete → PS-LF-001 WARNING and uses ProductSubstitutions;
+NRND → PS-LF-002 INFO; explicit RoHS Non-Compliant → PS-LF-003.
+Against: Active is silent; RoHS Not Applicable is not a fail; missing
+catalog row is silent; no substitution key means no invented replacement.
+"""
+
+from __future__ import annotations
+
+from backend.pinscopex.lifecycle import (
+    check_lifecycle,
+    parse_distributor_product,
+)
+from backend.pinscopex.models import Component, ComponentType, DesignGraph, Net, NetType, PinConnection
+
+
+def _graph(mpn="PARTX"):
+    u = Component(
+        reference="U1", value="", footprint="",
+        component_type=ComponentType.IC, mpn=mpn,
+        pins={"1": "VDD"},
+    )
+    return DesignGraph(
+        components={"U1": u},
+        nets={"VDD": Net(name="VDD", net_type=NetType.POWER, pins=[
+            PinConnection(component_ref="U1", pin_number="1"),
+        ])},
+    )
+
+
+def test_obsolete_is_warning_and_uses_distributor_replacement():
+    rec = parse_distributor_product("ABC", {
+        "ManufacturerProductNumber": "ABC",
+        "ProductStatus": "Obsolete",
+        "RoHSStatus": "RoHS3 Compliant",
+        "QuantityAvailable": 12,
+        "ManufacturerLeadWeeks": "8",
+        "ProductSubstitutions": [{"ManufacturerProductNumber": "ABC-B"}],
+    })
+    assert rec.lifecycle == "eol"
+    assert rec.rohs_compliant is True
+    assert rec.stock == 12
+    assert rec.replacement == "ABC-B"
+    findings = check_lifecycle(_graph("ABC"), {"ABC": rec})
+    assert len(findings) == 1
+    assert findings[0].rule_id == "PS-LF-001"
+    assert findings[0].status == "WARNING"
+    assert findings[0].source == "lifecycle_check"
+    assert "ABC-B" in (findings[0].recommendation or "")
+
+
+def test_nrnd_is_info():
+    rec = parse_distributor_product("N1", {"ProductStatus": "Not For New Designs"})
+    assert rec.lifecycle == "nrnd"
+    findings = check_lifecycle(_graph("N1"), {"N1": rec})
+    assert len(findings) == 1
+    assert findings[0].rule_id == "PS-LF-002"
+    assert findings[0].status == "INFO"
+
+
+def test_explicit_rohs_non_compliant_is_warning():
+    rec = parse_distributor_product("R1", {
+        "ProductStatus": "Active",
+        "RoHSStatus": "Non-Compliant",
+    })
+    assert rec.rohs_compliant is False
+    findings = check_lifecycle(_graph("R1"), {"R1": rec})
+    assert len(findings) == 1
+    assert findings[0].rule_id == "PS-LF-003"
+    assert findings[0].status == "WARNING"
+
+
+def test_active_is_silent():
+    rec = parse_distributor_product("A1", {"ProductStatus": "Active"})
+    assert rec.lifecycle == "active"
+    assert check_lifecycle(_graph("A1"), {"A1": rec}) == []
+
+
+def test_rohs_not_applicable_is_not_a_fail():
+    rec = parse_distributor_product("R2", {
+        "ProductStatus": "Active",
+        "RoHSStatus": "Not Applicable",
+    })
+    assert rec.rohs_compliant is None
+    assert check_lifecycle(_graph("R2"), {"R2": rec}) == []
+
+
+def test_missing_catalog_and_missing_substitute_are_not_guessed():
+    assert check_lifecycle(_graph("NOPE"), {}) == []
+    rec = parse_distributor_product("EOLX", {"ProductStatus": "Discontinued"})
+    assert rec.lifecycle == "eol"
+    assert rec.replacement is None
+    findings = check_lifecycle(_graph("EOLX"), {"EOLX": rec})
+    assert len(findings) == 1
+    assert findings[0].rule_id == "PS-LF-001"
+    assert "ABC-B" not in (findings[0].recommendation or "")
+    assert rec.replacement is None