component

SN74HC138DR

Public Unreviewed

by Ray

Texas Instruments Signal Switches, Multiplexers, Decoders, SOIC-16. Datasheet-verified pinout, KiCad symbol/footprint/3D.

componentlogicsn74hc138dr
Overview Files Discover Packages Releases Dependencies Issues Breadcrumbs Pull Requests Activity

3D Model

Open in new tab ↗
Loads on click. Unloads when scrolled away or the tab is hidden.

Symbol & Footprint

Schematic Symbol

Open full view ↗
Loads on click. Unloads when scrolled away or the tab is hidden.

PCB Footprint

Open full view ↗
Loads on click. Unloads when scrolled away or the tab is hidden.

Datasheet

Open in new tab ↗
Loads on click. Unloads when scrolled away or the tab is hidden.
Download PDF
Contents

README

markdown

SN74HC138DR

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

SN74HC138DR from Texas Instruments, in a SOIC-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 Select input A (least significant bit). Binary select LSB used together with B and C to choose which of Y0-Y7 is driven LOW.
2 B input Select input B. Middle bit of the 3-bit binary address selecting the active output.
3 C input Select input C (most significant bit). MSB of the 3-bit binary address selecting the active output.
4 ~{G2A} input Active-low enable A. Must be LOW (together with ~G2B LOW and G1 HIGH) to enable decoding; otherwise all Y outputs are forced HIGH.
5 ~{G2B} input Active-low enable B. Must be LOW (together with ~G2A LOW and G1 HIGH) to enable decoding; otherwise all Y outputs are forced HIGH.
6 G1 input Active-high enable. Must be HIGH together with ~G2A LOW and ~G2B LOW to enable outputs; can also serve as a data input for demultiplexing applications.
7 Y7 output Active-low decoded output 7 (most significant). Driven LOW when enables are active and select inputs CBA = 111; otherwise HIGH. Drives up to 10 LSTTL loads (±4 mA at 5 V).
8 GND power_in Ground reference (0 V).
9 Y6 output Active-low decoded output 6. Driven LOW when enables are active and CBA = 110.
10 Y5 output Active-low decoded output 5. Driven LOW when enables are active and CBA = 101.
11 Y4 output Active-low decoded output 4. Driven LOW when enables are active and CBA = 100.
12 Y3 output Active-low decoded output 3. Driven LOW when enables are active and CBA = 011.
13 Y2 output Active-low decoded output 2. Driven LOW when enables are active and CBA = 010.
14 Y1 output Active-low decoded output 1. Driven LOW when enables are active and CBA = 001.
15 Y0 output Active-low decoded output 0 (least significant). Driven LOW when enables are active and CBA = 000.
16 VCC power_in Supply voltage. Recommended 2 V to 6 V (nominal 5 V); absolute maximum 7 V. Typical ICC ≤ 80 µA.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • SN74HC138DRD
  • SN74HC138DR
  • SN74HC138DRDB
  • SN74HC138DRN
  • SN74HC138DRNS
  • SN74HC138DRPW
  • SN74HC138DRJ
  • SN74HC138DRW
  • SN74HC138DRFK

CAD (KiCad official)

  • Symbol: SN74HC138DR
  • Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
  • 3D model: SOIC-16 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: Texas Instruments datasheet (35 pp, sha256 ba6cab88a44c1c9a, retrieved 2026-08-17, tier: manufacturer)
  • 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