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SN74128D

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Texas Instruments Logic Gates, SOIC-14. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SN74128D

Texas Instruments · Logic Gates · SOIC-14

SN74128D from Texas Instruments, in a SOIC-14. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 1Y output Driver 1 output, NOR of 1A and 1B, designed to drive 50 ohm lines (IOL max 48 mA, IOH max -42.4 mA for SN74128).
2 1A input Driver 1 input A, VIH min 2 V and VIL max 0.8 V.
3 1B input Driver 1 input B, VIH min 2 V and VIL max 0.8 V.
4 2Y output Driver 2 output, NOR of 2A and 2B, designed to drive 50 ohm lines (IOL max 48 mA, IOH max -42.4 mA for SN74128).
5 2A input Driver 2 input A, VIH min 2 V and VIL max 0.8 V.
6 2B input Driver 2 input B, VIH min 2 V and VIL max 0.8 V.
7 GND power_in Ground; supply voltage values are specified with respect to this network ground terminal.
8 3A input Driver 3 input A, VIH min 2 V and VIL max 0.8 V.
9 3B input Driver 3 input B, VIH min 2 V and VIL max 0.8 V.
10 3Y output Driver 3 output, NOR of 3A and 3B, designed to drive 50 ohm lines (IOL max 48 mA, IOH max -42.4 mA for SN74128).
11 4A input Driver 4 input A, VIH min 2 V and VIL max 0.8 V.
12 4B input Driver 4 input B, VIH min 2 V and VIL max 0.8 V.
13 4Y output Driver 4 output, NOR of 4A and 4B, designed to drive 50 ohm lines (IOL max 48 mA, IOH max -42.4 mA for SN74128).
14 VCC power_in Supply voltage, 4.75 V to 5.25 V recommended for SN74128 (absolute max 7 V).

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-14
Category Logic
Pins 14

CAD (KiCad official)

  • Symbol: SN74128D
  • Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
  • 3D model: SOIC-14 (KiCad packages3D, STEP)
  • 3D model files: sn74128d-etched.step / sn74128d-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74128d.step / sn74128d.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (18 pp, sha256 2c99c52b5e389124, retrieved 2026-10-07, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF