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SN74ALS139DR

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Texas Instruments Signal Switches, Multiplexers, Decoders, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SN74ALS139DR

Texas Instruments · Signal Switches, Multiplexers, Decoders · SOIC-16

SN74ALS139DR from Texas Instruments, in a SOIC-16. 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 1G input Active-low enable for decoder 1; when it is high, all outputs 1Y0 to 1Y3 are high regardless of the select inputs.
2 1A input Select input A (least significant bit) for decoder 1; fully buffered, presenting one normalized load to its driver and Schottky-clamped.
3 1B input Select input B (most significant bit) for decoder 1; fully buffered, presenting one normalized load to its driver and Schottky-clamped.
4 1Y0 output Active-low output 0 of decoder 1; goes low when 1G is low and B, A are both low.
5 1Y1 output Active-low output 1 of decoder 1; goes low when 1G is low and A is high with B low.
6 1Y2 output Active-low output 2 of decoder 1; goes low when 1G is low and B is high with A low.
7 1Y3 output Active-low output 3 of decoder 1; goes low when 1G is low and B, A are both high.
8 GND power_in Ground reference for the device.
9 2Y3 output Active-low output 3 of decoder 2; goes low when 2G is low and B, A are both high.
10 2Y2 output Active-low output 2 of decoder 2; goes low when 2G is low and B is high with A low.
11 2Y1 output Active-low output 1 of decoder 2; goes low when 2G is low and A is high with B low.
12 2Y0 output Active-low output 0 of decoder 2; goes low when 2G is low and B, A are both low.
13 2B input Select input B (most significant bit) for decoder 2; fully buffered, presenting one normalized load to its driver and Schottky-clamped.
14 2A input Select input A (least significant bit) for decoder 2; fully buffered, presenting one normalized load to its driver and Schottky-clamped.
15 2G input Active-low enable for decoder 2; when it is high, all outputs 2Y0 to 2Y3 are high regardless of the select inputs.
16 VCC power_in Supply voltage, 4.5 V to 5.5 V recommended (5 V nominal); absolute maximum rating is 7 V.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-16
Category Logic
Pins 16

CAD (KiCad official)

  • Symbol: SN74ALS139DR
  • Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
  • 3D model: SOIC-16 (KiCad packages3D, STEP)
  • 3D model files: sn74als139dr-etched.step / sn74als139dr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74als139dr.step / sn74als139dr.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (17 pp, sha256 60dc2c1d0468b164, retrieved 2026-10-08, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-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