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74HC138M

Public Made by Adom

by adom

HGSEMI Signal Switches / Encoders & Decoders / Multiplexers, SOP-16. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs 74hc138m: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
74hc138m-etched.fit.json 74hc138m: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray
74hc138m-etched.glb 74hc138m: one-pass backfill (re-etched) · Ray
74hc138m-etched.step 74hc138m: one-pass backfill (re-etched) · Ray
74hc138m-hero.glb 74hc138m: hero from the plain model · Ray
74hc138m-hero.overlay.json 74hc138m: hero from the plain model · Ray
74hc138m.glb Publish 0.1.0 · Ray
74hc138m.kicad_mod Publish 0.1.0 · Ray
74hc138m.kicad_sym Publish 0.1.0 · Ray
74hc138m.lbr rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect an… · Ray
74hc138m.step Publish 0.1.0 · Ray
package.json Publish 0.2.2 · Ray
pads.json pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray
page.json Publish 0.2.2 · Ray
README.md 74hc138m: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray

74HC138M

HGSEMI · Signal Switches / Encoders & Decoders / Multiplexers · SOP-16

74HC138M from HGSEMI, in a SOP-16. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 A input Address select input bit 0 (LSB). Binary-weighted select input combined with B and C to choose which of Y0-Y7 is asserted low.
2 B input Address select input bit 1. Binary-weighted select input combined with A and C to choose the active output.
3 C input Address select input bit 2 (MSB). Binary-weighted select input combined with A and B to choose the active output.
4 ~{G2A} input Active-low enable input. Both G2A and G2B must be low (and G1 high) for any output to be selected; otherwise all outputs are held high.
5 ~{G2B} input Active-low enable input. Both G2A and G2B must be low (and G1 high) for any output to be selected; otherwise all outputs are held high.
6 G1 input Active-high enable input. Must be high (with G2A and G2B low) to enable the decoder outputs.
7 Y7 output Decoded output 7 (active-low). Driven low when enabled and CBA = 111; otherwise high. Drive capability 5.2 mA at VCC=6V.
8 GND power_in Ground / negative supply reference (0 V).
9 Y6 output Decoded output 6 (active-low). Driven low when enabled and CBA = 110; otherwise high.
10 Y5 output Decoded output 5 (active-low). Driven low when enabled and CBA = 101; otherwise high.
11 Y4 output Decoded output 4 (active-low). Driven low when enabled and CBA = 100; otherwise high.
12 Y3 output Decoded output 3 (active-low). Driven low when enabled and CBA = 011; otherwise high.
13 Y2 output Decoded output 2 (active-low). Driven low when enabled and CBA = 010; otherwise high.
14 Y1 output Decoded output 1 (active-low). Driven low when enabled and CBA = 001; otherwise high.
15 Y0 output Decoded output 0 (active-low). Driven low when enabled and CBA = 000; otherwise high.
16 VCC power_in Positive supply input. Operating range 2.0 V to 6.0 V (absolute max 6.5 V). Bypass with a 100 nF ceramic close to the pin.

Key specifications

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

Ordering variants

  • 74HC138M/TR
  • 74HC138M74HC138N
  • 74HC138MT/TR
  • 74HC138M74HC138LQ/TR

CAD (KiCad official)

  • Symbol: 74HC138M
  • Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
  • 3D model: SOP-16 (KiCad packages3D, STEP)
  • 3D model files: 74hc138m-etched.step / 74hc138m-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 74hc138m.step / 74hc138m.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
74hc138m.step 217 KB You want the bare part, or you mark your own boards.
74hc138m-etched.step 2.1 MB You want the part with 74HC138M already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 534 faces against 267 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

  • Datasheet: HGSEMI datasheet (10 pp, sha256 c1019058ded7c03f, retrieved 2026-08-17, tier: lcsc)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF