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 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