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SN74LS138DR
Public Made by Adomby adom
Texas Instruments Signal Switches, Multiplexers, Decoders, SOIC-16. Datasheet-verified pinout, 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
markdownSN74LS138DR
Texas Instruments · Signal Switches, Multiplexers, Decoders · SOIC-16
SN74LS138DR 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 | Binary select input A, one of three address inputs used with B and C to select which of the eight outputs is active when the device is enabled. |
| 2 | B | input | Binary select input B, one of three address inputs used with A and C to select which of the eight outputs is active when the device is enabled. |
| 3 | C | input | Binary select input C, one of three address inputs used with A and B to select which of the eight outputs is active when the device is enabled. |
| 4 | G2A | input | Active-low enable input; must be low, together with G2B low and G1 high, for the decoder outputs to be active (per function table). |
| 5 | G2B | input | Active-low enable input; must be low, together with G2A low and G1 high, for the decoder outputs to be active (per function table). |
| 6 | G1 | input | Active-high enable input; must be high, together with G2A and G2B both low, for the decoder outputs to be active (per function table). |
| 7 | Y7 | output | Active-low decoded output 7; driven low only when this output is selected and the device is enabled, otherwise held high. |
| 8 | GND | power_in | Ground reference for the device. |
| 9 | Y6 | output | Active-low decoded output 6; driven low only when this output is selected and the device is enabled, otherwise held high. |
| 10 | Y5 | output | Active-low decoded output 5; driven low only when this output is selected and the device is enabled, otherwise held high. |
| 11 | Y4 | output | Active-low decoded output 4; driven low only when this output is selected and the device is enabled, otherwise held high. |
| 12 | Y3 | output | Active-low decoded output 3; driven low only when this output is selected and the device is enabled, otherwise held high. |
| 13 | Y2 | output | Active-low decoded output 2; driven low only when this output is selected and the device is enabled, otherwise held high. |
| 14 | Y1 | output | Active-low decoded output 1; driven low only when this output is selected and the device is enabled, otherwise held high. |
| 15 | Y0 | output | Active-low decoded output 0; driven low only when this output is selected and the device is enabled, otherwise held high. |
| 16 | VCC | power_in | Positive supply voltage pin for the device. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16 |
| Category | Logic |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
SN74LS138DR - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files:
sn74ls138dr-etched.step/sn74ls138dr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sn74ls138dr.step/sn74ls138dr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (26 pp, sha256
4fd09e5dfa700e29, retrieved 2026-09-23, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-sonnet-5(vision), consensusclaude-opus-4-8(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).