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74HC138MT

Public Made by Adom

by adom

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

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74HC138MT

HGSEMI · Signal Switches, Multiplexers, Decoders · TSSOP-16

74HC138MT from HGSEMI, 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 address data input A (weight 1) that selects which of the eight outputs Y0 to Y7 goes low.
2 B input Binary address data input B (weight 2) that selects which of the eight outputs Y0 to Y7 goes low.
3 C input Binary address data input C (weight 4) that selects which of the eight outputs Y0 to Y7 goes low.
4 G2B input Active-low enable input; it must be low, together with G2A low and G1 high, for the decoder to be enabled.
5 G2A input Active-low enable input; it must be low, together with G2B low and G1 high, for the decoder to be enabled.
6 G1 input Active-high enable input; it must be high, together with G2A and G2B low, for the decoder to be enabled.
7 Y7 output Active-low decoded parallel output 7, driven low when the address selects it and the enables are active.
8 GND power_in Ground reference pin for the device.
9 Y6 output Active-low decoded parallel output 6, driven low when the address selects it and the enables are active.
10 Y5 output Active-low decoded parallel output 5, driven low when the address selects it and the enables are active.
11 Y4 output Active-low decoded parallel output 4, driven low when the address selects it and the enables are active.
12 Y3 output Active-low decoded parallel output 3, driven low when the address selects it and the enables are active.
13 Y2 output Active-low decoded parallel output 2, driven low when the address selects it and the enables are active.
14 Y1 output Active-low decoded parallel output 1, driven low when the address selects it and the enables are active.
15 Y0 output Active-low decoded parallel output 0, driven low when the address selects it and the enables are active.
16 VCC power_in Positive supply pin; the recommended supply range is 2.0 V to 6.0 V (absolute maximum -0.5 V to 6.5 V).

Key specifications

Parameter Value
Manufacturer HGSEMI
Package TSSOP-16
Category Logic
Pins 16

CAD (KiCad official)

  • Symbol: 74HC138MT
  • Footprint: Package_SO:TSSOP-16_4.4x5mm_P0.65mm
  • 3D model: TSSOP-16 (KiCad packages3D, STEP)
  • 3D model files: 74hc138mt-etched.step / 74hc138mt-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 74hc138mt.step / 74hc138mt.glb are the bare package body.

Provenance

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

  • Datasheet: HGSEMI datasheet (10 pp, sha256 c1019058ded7c03f, retrieved 2026-10-17, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • 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