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SN74HCT138PWR

Public Made by Adom

by adom

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

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SN74HCT138PWR

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

SN74HCT138PWR from Texas Instruments, in a TSSOP-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 Binary select input A (LSB) that, with B and C, selects one of eight active-low outputs; inputs are TTL-compatible with VIH 2 V min and VIL 0.8 V max.
2 B input Binary select input B that, with A and C, selects one of eight active-low outputs; inputs are TTL-compatible with VIH 2 V min and VIL 0.8 V max.
3 C input Binary select input C (MSB) that, with A and B, selects one of eight active-low outputs; inputs are TTL-compatible with VIH 2 V min and VIL 0.8 V max.
4 G2A input Active-low enable input G2A; all outputs stay high unless G2A and G2B are low and G1 is high.
5 G2B input Active-low enable input G2B; all outputs stay high unless G2A and G2B are low and G1 is high.
6 G1 input Active-high enable input G1; must be high, with G2A and G2B low, to enable the decoder outputs.
7 Y7 output Active-low decoded output 7 that goes low when select code CBA = 111 and the device is enabled, with ±4 mA drive at 5 V.
8 GND power_in Ground pin, 0 V reference.
9 Y6 output Active-low decoded output 6 that goes low when select code CBA = 110 and the device is enabled, with ±4 mA drive at 5 V.
10 Y5 output Active-low decoded output 5 that goes low when select code CBA = 101 and the device is enabled, with ±4 mA drive at 5 V.
11 Y4 output Active-low decoded output 4 that goes low when select code CBA = 100 and the device is enabled, with ±4 mA drive at 5 V.
12 Y3 output Active-low decoded output 3 that goes low when select code CBA = 011 and the device is enabled, with ±4 mA drive at 5 V.
13 Y2 output Active-low decoded output 2 that goes low when select code CBA = 010 and the device is enabled, with ±4 mA drive at 5 V.
14 Y1 output Active-low decoded output 1 that goes low when select code CBA = 001 and the device is enabled, with ±4 mA drive at 5 V.
15 Y0 output Active-low decoded output 0 that goes low when select code CBA = 000 and the device is enabled, with ±4 mA drive at 5 V.
16 VCC power_in Supply voltage pin, 4.5 V to 5.5 V recommended, with a 0.1-µF bypass capacitor placed close to the pin.

Key specifications

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

CAD (KiCad official)

  • Symbol: SN74HCT138PWR
  • Footprint: Package_SO:TSSOP-16_4.4x5mm_P0.65mm
  • 3D model: TSSOP-16 (KiCad packages3D, STEP)
  • 3D model files: sn74hct138pwr-etched.step / sn74hct138pwr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74hct138pwr.step / sn74hct138pwr.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (28 pp, sha256 a0bbbcc2ac42625a, retrieved 2026-10-06, 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