Part Audit Review

C

cherepanyadima

Review all available part information (MPN, package, pin count, description, properties). If no datasheet URL is already set, search the web for the official datasheet and update the part's Datasheet property with the URL. Then cross-check the schematic symbol, footprint, and pin descriptions against the datasheet. Summarize key specs and flag any mismatches.

flux

I’ll audit the part metadata, find and attach the official datasheet if needed, then verify symbol pins and footprint geometry against it and report any mismatches.
Created a project doc

Part Audit Report

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Part Audit Report Scope
Audit of available metadata, schematic terminals, footprint, 3D asset, and the currently configured KEC TL431 datasheet.
Available part information Datasheet identity and key specifications
The configured document identifies the KEC TL431 series as a three-terminal programmable precision shunt regulator/reference. The values below were extracted from the configured datasheet by OCR; critical production decisions should be checked directly in the PDF because the extraction did not return Flux-resolvable citation markers.
Symbol and terminal cross-check
The datasheet TO-92 front-view pin assignment is:
Symbol pin order and names are correct. However, all three terminals have Pin Type: Unspecified and no descriptive pin-function text. Recommen...

flux

Audit complete. The existing KEC datasheet URL was already populated, so it was retained; pin mapping 1=REF, 2=A, 3=K and the TO-92 lead spacing match the datasheet.
Flagged issues include incorrect Transistors classification, missing package/pin-count metadata, unspecified pin types, generic description, misleading BC239C footprint naming, disabled/displaced silkscreen, and tight hole/annular-ring margins. Full specs and findings are in the Part Audit Report.
Correct metadata and footprint
Improve hole margins
Replace footprint asset
Set pin electrical types
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Layout

3D View

Part Audit Report
Scope
Audit of available metadata, schematic terminals, footprint, 3D asset, and the currently configured KEC TL431 datasheet.
Available part information

Table

FieldCurrent valueAssessment
ManufacturerKECConsistent with the configured datasheet
MPNTL431Valid base family/orderable variant; indicates the standard-tolerance TO-92 version in the KEC datasheet
DescriptionBIPOLAR LINEAR INTEGRATED CIRCUITVery generic; does not identify the actual function
Part TypeTransistorsMismatch: TL431 is an adjustable precision shunt regulator / programmable reference, not a transistor
Designator PrefixICAcceptable, though U is more conventional
Package propertyNot setMissing metadata; footprint and MPN imply TO-92, 3-lead, through-hole
Pin Count propertyNot setMissing metadata; three terminals exist
DatasheetExisting KEC/IHS PDF URL is setNo URL update was required
AssetsTL431 Symbol.svg, BC239C.kicad_mod, TL431.stpFootprint filename is misleading; geometry is broadly compatible with the KEC TO-92 outline
Datasheet identity and key specifications
The configured document identifies the KEC TL431 series as a three-terminal programmable precision shunt regulator/reference. The values below were extracted from the configured datasheet by OCR; critical production decisions should be checked directly in the PDF because the extraction did not return Flux-resolvable citation markers.

Table

ParameterTL431 value
Nominal reference voltage2.495 V
Reference-voltage limits at 25 C2.440 to 2.550 V (about 2.2% grade)
Programmable cathode voltageVREF to 36 V operating description
Absolute maximum cathode-to-anode voltage37 V
Recommended regulating cathode-current range1 mA to 100 mA
Continuous cathode-current absolute range-100 mA to 150 mA
Minimum cathode current for regulation0.5 mA typical, 1.0 mA maximum
Reference input current1.8 uA typical, 4.0 uA maximum at 25 C
Dynamic impedance0.22 ohm typical
Operating temperature-40 C to 85 C
Maximum junction temperature150 C
TO-92 power dissipation700 mW at stated datasheet conditions
Symbol and terminal cross-check
The datasheet TO-92 front-view pin assignment is:

Table

Physical pinDatasheet name/functionCurrent terminalResult
1REFERENCE — control/reference inputREF, Pin Number 1Match
2ANODE — common/anode terminalA, Pin Number 2Match
3CATHODE — shunt-current/cathode terminalK, Pin Number 3Match
Symbol pin order and names are correct. However, all three terminals have Pin Type: Unspecified and no descriptive pin-function text. Recommended descriptions are Reference input, Anode/common, and Cathode/shunt output. Electrical pin types should also be assigned intentionally rather than left unspecified.
Footprint cross-check
Current footprint payload:
  • Three plated through-holes in a straight line.
  • Adjacent pitch: 1.27 mm; pin 1-to-3 span: 2.54 mm.
  • Pad diameter: 1.00 mm.
  • Drill diameter: 0.65 mm.
  • Pad mapping: pad 1 = REF, pad 2 = A, pad 3 = K.
KEC TO-92 data indicates 1.27 mm adjacent lead spacing and approximately 0.45 mm leads, up to roughly 0.55 mm in the extracted package table. Therefore:
  • Pad positions and pin mapping match.
  • 0.65 mm drill is plausible but tight against a 0.55 mm maximum lead, leaving only about 0.05 mm radial clearance. Verify lead-form tolerance and fabrication drill tolerance; a larger finished hole may improve assembly robustness.
  • 1.00 mm pad diameter gives a small annular ring with a 0.65 mm drill (0.175 mm nominal radial ring). Confirm this meets the selected fabricator's minimum annular-ring rules.
  • The footprint body/courtyard is broadly TO-92-sized, but its source filename/value is BC239C, not TL431. This is a documentation/library-quality issue rather than an electrical pinout error.
  • The imported footprint has disabled or displaced silkscreen geometry in the current rules, so visual body and pin-1 indication should be reviewed before reuse.
Flagged mismatches and risks
  1. Incorrect part classification: Part Type = Transistors should be voltage reference / shunt regulator / integrated circuit.
  2. Missing package metadata: should identify TO-92, 3-pin, through-hole for base MPN TL431.
  3. Missing direct pin-count property: should be 3 if that property is supported.
  4. Generic description: replace with Adjustable precision shunt regulator / programmable voltage reference.
  5. Pin metadata incomplete: all pin types are unspecified and pin descriptions are absent.
  6. Misnamed footprint asset: BC239C.kicad_mod is confusing even though its 1.27 mm straight-lead geometry matches this KEC TL431 package.
  7. Potentially tight holes/annular rings: mechanically plausible, but should be checked against component lead and PCB vendor tolerances.
  8. Silkscreen state: footprint silk appears disabled/displaced and may not provide a useful body outline or pin-1 marker.
Overall verdict
The electrically critical 1=REF, 2=A, 3=K mapping is correct, and the basic three-hole TO-92 footprint geometry agrees with the configured KEC datasheet. The main problems are metadata quality, unspecified pin semantics, a misleading footprint asset name, and manufacturability margin around the 0.65 mm holes and 1.00 mm pads.

  • Scope

  • Available part information

  • Datasheet identity and key specifications

  • Symbol and terminal cross-check

  • Footprint cross-check

  • Flagged mismatches and risks

  • Overall verdict