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SN74HC138N
Public Made by Adomby adom
Texas Instruments Signal Switches, Multiplexers, Decoders, DIP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownSN74HC138N
Texas Instruments · Signal Switches, Multiplexers, Decoders · DIP-16
SN74HC138N from Texas Instruments, in a DIP-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 | Binary select input A (least significant bit) for 3-to-8 decoder output selection |
| 2 | B | input | Binary select input B for 3-to-8 decoder output selection |
| 3 | C | input | Binary select input C (most significant bit) for 3-to-8 decoder output selection |
| 4 | G2A | input | Active low enable input A; decoder enabled only when G2A=L, G2B=L, and G1=H |
| 5 | G2B | input | Active low enable input B; decoder enabled only when G2A=L, G2B=L, and G1=H |
| 6 | G1 | input | Active high enable input; decoder enabled only when G2A=L, G2B=L, and G1=H |
| 7 | Y7 | output | Decoded output 7 (most significant bit), pulled low when selected and all enables active, otherwise high |
| 8 | GND | power_in | Ground (0V reference) |
| 9 | Y6 | output | Decoded output 6, pulled low when selected and all enables active, otherwise high |
| 10 | Y5 | output | Decoded output 5, pulled low when selected and all enables active, otherwise high |
| 11 | Y4 | output | Decoded output 4, pulled low when selected and all enables active, otherwise high |
| 12 | Y3 | output | Decoded output 3, pulled low when selected and all enables active, otherwise high |
| 13 | Y2 | output | Decoded output 2, pulled low when selected and all enables active, otherwise high |
| 14 | Y1 | output | Decoded output 1, pulled low when selected and all enables active, otherwise high |
| 15 | Y0 | output | Decoded output 0 (least significant bit), pulled low when selected and all enables active, otherwise high |
| 16 | VCC | power_in | Positive supply voltage, recommended operating range 2V to 6V per section 6.3 |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | DIP-16 |
| Category | Logic |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
SN74HC138N - Footprint:
Package_DIP:DIP-16_W7.62mm - 3D model: DIP-16 (KiCad packages3D, STEP)
- 3D model files:
sn74hc138n-etched.step/sn74hc138n-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sn74hc138n.step/sn74hc138n.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (35 pp, sha256
15affbc6002f8558, retrieved 2026-09-23, 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 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-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).