Part Review and Datasheet Verification

flux

I’ll review the part metadata, find and attach the official datasheet if needed, then compare symbol, footprint, and pin descriptions against the datasheet.

flux

Completed the part review and documented the detailed findings in 74HC238N Part Review Results (74hc238n-part-review-results). The schematic pinout matches the datasheet, and the footprint appears consistent with DIP16/SOT38-4 at the outline level.
Open items / flags:
  • Package or Case Code is set to TO; it should be DIP16 / SOT38-4.
  • All terminal Pin Type properties are Unspecified; they should ideally be Input, Output, Power, or Ground.
  • Datasheet URL was already set, so I did not overwrite it, but the official Nexperia URL is https://assets.nexperia.com/documents/data-sheet/74HC_HCT238.pdf.
  • Exact pad/drill geometry could not be fully verified from the available layout inspection output.
Suggested next steps:
  1. Update the package property to DIP16 or SOT38-4.
  2. Set datasheet-based pin types for all terminals.
  3. Optionally replace the uploaded datasheet URL with the official Nexperia URL.
Fix properties and review
Fix flagged issues
Verify footprint geometry
Run ERC/DRC
Improve symbol layout
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Symbol

Layout

Preview

74HC238N Part Review Results
Part metadata reviewed
Datasheet identity
The current uploaded datasheet content matches the Nexperia/NXP 74HC238; 74HCT238 product datasheet. The official Nexperia product page points to 74HC_HCT238.pdf.
Key datasheet specs
  • Function: 3-to-8 line decoder/demultiplexer, non-inverting active-HIGH outputs.
  • Logic family: 74HC high-speed Si-gate CMOS, pin-compatible with LSTTL.
  • Enables: E1 and E2 active LOW; E3 active HIGH.
  • Output behavior: all outputs LOW unless E1 = LOW, E2 = LOW, and E3 = HIGH; selected output Y0-Y7 goes HIGH based on A0-A2.
  • Recommended VCC for 74HC238: 2.0 V to 6.0 V, typ. 5.0 V.
  • Absolute max VCC: -0.5 V to +7 V.
  • Operating temperature for 74HC238N: -40 °C to +125 °C.
  • ESD: HBM exceeds 2000 V; MM exceeds 200 V.
  • Package for 74HC238N: DIP16, plastic dual in-line, 16 leads, 300 mil, package version SOT38-4.
  • DIP16 package pitch: 2.54 mm; row spacing e1: 7.62 mm; body length D: 18.55 to 19.50 mm; body width E: 6.20 to 6.48 mm.
Pinout cross-check

Table

PinDatasheet signalDatasheet descriptionProject terminalResult
1A0Address inputA0Match
2A1Address inputA1Match
3A2Address inputA2Match
4E1Enable input, active LOW~E1Match; project explicitly marks active-low
5E2Enable input, active LOW~E2Match; project explicitly marks active-low
6E3Enable input, active HIGHE3Match
7Y7Output, active HIGHY7Match
8GNDGround, 0 VGNDMatch
9Y6Output, active HIGHY6Match
10Y5Output, active HIGHY5Match
11Y4Output, active HIGHY4Match
12Y3Output, active HIGHY3Match
13Y2Output, active HIGHY2Match
14Y1Output, active HIGHY1Match
15Y0Output, active HIGHY0Match
16VCCSupply voltageVCCMatch
Symbol review
The schematic symbol contains 16 terminal components with the correct terminal names and pin numbers. Input/address and enable pins are generally on the left, outputs are generally on the right, and VCC/GND are present. One cosmetic/organization issue: Y7 and GND are placed on the left side of the symbol while the other outputs/power are mostly right-side; this is not a pinout error but may reduce symbol readability.
Footprint review
The layout contains 16 pad nodes and a DIP-like rectangular outline. The silkscreen/fab outline dimensions observed are approximately 6.48 mm body width by 19.5 mm body length, consistent with the SOT38-4 DIP16 datasheet body dimensions. The visible footprint outline is consistent with a 300 mil DIP16 package, but the inspected layout response did not expose individual pad coordinates or drill/annular-ring details, so exact 2.54 mm pitch, 7.62 mm row spacing, hole size, and pad geometry were not fully verifiable from available layout data.
Mismatches / flags
  1. Project property Package or Case Code is set to TO, which does not match the datasheet. For 74HC238N it should be DIP16 / SOT38-4, plastic dual-in-line package, 16 leads, 300 mil.
  2. Terminal Pin Type properties are all Unspecified. Datasheet-based pin types should ideally be set as: A0/A1/A2/E1/E2/E3 = Input; Y0-Y7 = Output; VCC = Power; GND = Ground/Power.
  3. Datasheet URL property is already populated, so no URL update was required by the request. However, the property points to an uploaded copy rather than the official Nexperia URL. If preferred, update it to: https://assets.nexperia.com/documents/data-sheet/74HC_HCT238.pdf
  4. Footprint appears consistent at the package-outline level, but detailed pad/drill dimensions were not available in the inspection output for a complete mechanical verification.

  • Part metadata reviewed

  • Datasheet identity

  • Key datasheet specs

  • Pinout cross-check

  • Symbol review

  • Footprint review

  • Mismatches / flags