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Generated by kicad-footprint-generator · KiCad file format 20260206

Name	Last commit message	Last updated
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README.md	Initial commit: component/sn74ahct138dr · Ray	2d ago
sn74ahct138dr-etched.glb	sn74ahct138dr: factory component page (tier=mfr) · Ray	2d ago
sn74ahct138dr-etched.step	sn74ahct138dr: factory component page (tier=mfr) · Ray	2d ago
sn74ahct138dr-hero.glb	sn74ahct138dr: hero GLB from the etched model (keeps the MPN mark) · Ray	1d ago
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sn74ahct138dr.step	Publish 0.1.0 · Ray	2d ago

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