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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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

Documents

  • 74HC238N Part Review Results

Assets

kicad_mod

74HC238N

DIP802W53P254L1902H420Q16N.kicad_modFootprint
74HC238N

74HC238N

74HC238N Symbol.svgDefault
step

DIP-16_W7.62mm.step

3D_DIP-16_W7.62mm
74HC238N-thumb.png

74HC238N-thumb.png

74HC238N-thumbThumbnail

74HC238N

74HC238N thumbnail
3-to-8 line decoder/demultiplexer
The 74HC238; 74HCT238 decodes three binary weighted address inputs (A0, A1 and A2) to eight mutually exclusive outputs (Y0 to Y7). The device features three enable inputs (E1 and E2 and E3). Every output will be LOW unless E1 and E2 are LOW and E3 is HIGH. This multiple enable function allows easy parallel expansion to a 1-of-32 (5 to 32 lines) decoder with just four '238 ICs and one inverter. The '238 can be used as an eight output demultiplexer by using one of the active LOW enable inputs as the data input and the remaining enable inputs as strobes. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.
• Wide supply voltage range from 2.0 to 6.0 V • CMOS low power dissipation • High noise immunity • Demultiplexing capability • Multiple input enable for easy expansion • Ideal for memory chip select decoding • Active HIGH mutually exclusive outputs • Input levels: • For 74HC238: CMOS level • For 74HCT238: TTL level • Complies with JEDEC standards • JESD8C (2.7 V to 3.6 V) • JESD7A (2.0 V to 6.0 V) • Latch-up performance exceeds 100 mA per JESD 78 Class II Level B • ESD protection: • HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V • CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V • Multiple package options • Specified from -40 °C to +85 °C and from -40 °C to +125 °C
#74HC238N #74HCSeries #CMOSLogic #DecoderIC #Demultiplexer #DigitalLogic #AddressDecoder #ChipSelect #LogicGate #IntegratedCircuit #ElectronicsDesign #EmbeddedSystems

Properties

74HC238N

Nexperia

Integrated Circuit

media.digikey.com/pdf/Data%20Sheets/NXP%20PDFs/74HC(T)238_Rev_Feb2017.pdf

IC

DIP16

parametric-v1

creativecommons.org/licenses/by/4.0/

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