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SN74LS51DR

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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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SN74LS51DR

Texas Instruments · Logic Gates · SOIC-14

SN74LS51DR 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 1A input Gate 1 input A, part of the first AND term (1A·1B·1C) of the 3-input AND-OR-invert gate.
2 2A input Gate 2 input A, part of the first AND term (2A·2B) of the 2-input AND-OR-invert gate.
3 2B input Gate 2 input B, part of the first AND term (2A·2B) of the 2-input AND-OR-invert gate.
4 2C input Gate 2 input C, part of the second AND term (2C·2D) of the 2-input AND-OR-invert gate.
5 2D input Gate 2 input D, part of the second AND term (2C·2D) of the 2-input AND-OR-invert gate.
6 2Y output Gate 2 output, 2Y = NOT[(2A·2B)+(2C·2D)].
7 GND power_in Ground.
8 1Y output Gate 1 output, 1Y = NOT[(1A·1B·1C)+(1D·1E·1F)].
9 1D input Gate 1 input D, part of the second AND term (1D·1E·1F) of the 3-input AND-OR-invert gate.
10 1E input Gate 1 input E, part of the second AND term (1D·1E·1F) of the 3-input AND-OR-invert gate.
11 1F input Gate 1 input F, part of the second AND term (1D·1E·1F) of the 3-input AND-OR-invert gate.
12 1B input Gate 1 input B, part of the first AND term (1A·1B·1C) of the 3-input AND-OR-invert gate.
13 1C input Gate 1 input C, part of the first AND term (1A·1B·1C) of the 3-input AND-OR-invert gate.
14 VCC power_in Supply voltage.

Key specifications

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

CAD (KiCad official)

  • Symbol: SN74LS51DR
  • Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
  • 3D model: SOIC-14 (KiCad packages3D, STEP)
  • 3D model files: sn74ls51dr-etched.step / sn74ls51dr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74ls51dr.step / sn74ls51dr.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (24 pp, sha256 8dae26aa17b15caa, retrieved 2026-10-07, tier: manufacturer)
  • 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