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SN74AHCT138DR

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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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SN74AHCT138DR

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

SN74AHCT138DR 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 A input Address input A of the 3-line to 8-line decoder; inputs are TTL-voltage compatible and must not be left floating.
2 B input Address input B of the 3-line to 8-line decoder; inputs are TTL-voltage compatible and must not be left floating.
3 C input Address input C of the 3-line to 8-line decoder; inputs are TTL-voltage compatible and must not be left floating.
4 G2A input Strobe (enable) input 2A, active low, used with G2B and G1 to enable the decoder outputs.
5 G2B input Strobe (enable) input 2B, active low, used with G2A and G1 to enable the decoder outputs.
6 G1 input Strobe (enable) input G1, used with G2A and G2B to enable the decoder outputs.
7 Y7 output Decoder output 7, driven by the 3-line to 8-line decode of inputs A, B and C when enabled.
8 GND power_in Ground reference for the device.
9 Y6 output Decoder output 6, driven by the 3-line to 8-line decode of inputs A, B and C when enabled.
10 Y5 output Decoder output 5, driven by the 3-line to 8-line decode of inputs A, B and C when enabled.
11 Y4 output Decoder output 4, driven by the 3-line to 8-line decode of inputs A, B and C when enabled.
12 Y3 output Decoder output 3, driven by the 3-line to 8-line decode of inputs A, B and C when enabled.
13 Y2 output Decoder output 2, driven by the 3-line to 8-line decode of inputs A, B and C when enabled.
14 Y1 output Decoder output 1, driven by the 3-line to 8-line decode of inputs A, B and C when enabled.
15 Y0 output Decoder output 0, driven by the 3-line to 8-line decode of inputs A, B and C when enabled.
16 VCC power_in Positive supply; recommended supply range is 1.5 V to 5.5 V and each VCC terminal should have a bypass capacitor (0.1 µF recommended).

Key specifications

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

CAD (KiCad official)

  • Symbol: SN74AHCT138DR
  • Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
  • 3D model: SOIC-16 (KiCad packages3D, STEP)
  • 3D model files: sn74ahct138dr-etched.step / sn74ahct138dr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74ahct138dr.step / sn74ahct138dr.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (40 pp, sha256 e1c16c1f6e6b2f98, 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