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SN74HCT138PWR
Public Made by Adomby adom
Texas Instruments Signal Switches, Multiplexers, Decoders, TSSOP-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
markdownSN74HCT138PWR
Texas Instruments · Signal Switches, Multiplexers, Decoders · TSSOP-16
SN74HCT138PWR from Texas Instruments, in a TSSOP-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 | Binary select input A (LSB) that, with B and C, selects one of eight active-low outputs; inputs are TTL-compatible with VIH 2 V min and VIL 0.8 V max. |
| 2 | B | input | Binary select input B that, with A and C, selects one of eight active-low outputs; inputs are TTL-compatible with VIH 2 V min and VIL 0.8 V max. |
| 3 | C | input | Binary select input C (MSB) that, with A and B, selects one of eight active-low outputs; inputs are TTL-compatible with VIH 2 V min and VIL 0.8 V max. |
| 4 | G2A | input | Active-low enable input G2A; all outputs stay high unless G2A and G2B are low and G1 is high. |
| 5 | G2B | input | Active-low enable input G2B; all outputs stay high unless G2A and G2B are low and G1 is high. |
| 6 | G1 | input | Active-high enable input G1; must be high, with G2A and G2B low, to enable the decoder outputs. |
| 7 | Y7 | output | Active-low decoded output 7 that goes low when select code CBA = 111 and the device is enabled, with ±4 mA drive at 5 V. |
| 8 | GND | power_in | Ground pin, 0 V reference. |
| 9 | Y6 | output | Active-low decoded output 6 that goes low when select code CBA = 110 and the device is enabled, with ±4 mA drive at 5 V. |
| 10 | Y5 | output | Active-low decoded output 5 that goes low when select code CBA = 101 and the device is enabled, with ±4 mA drive at 5 V. |
| 11 | Y4 | output | Active-low decoded output 4 that goes low when select code CBA = 100 and the device is enabled, with ±4 mA drive at 5 V. |
| 12 | Y3 | output | Active-low decoded output 3 that goes low when select code CBA = 011 and the device is enabled, with ±4 mA drive at 5 V. |
| 13 | Y2 | output | Active-low decoded output 2 that goes low when select code CBA = 010 and the device is enabled, with ±4 mA drive at 5 V. |
| 14 | Y1 | output | Active-low decoded output 1 that goes low when select code CBA = 001 and the device is enabled, with ±4 mA drive at 5 V. |
| 15 | Y0 | output | Active-low decoded output 0 that goes low when select code CBA = 000 and the device is enabled, with ±4 mA drive at 5 V. |
| 16 | VCC | power_in | Supply voltage pin, 4.5 V to 5.5 V recommended, with a 0.1-µF bypass capacitor placed close to the pin. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-16 |
| Category | Logic |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
SN74HCT138PWR - Footprint:
Package_SO:TSSOP-16_4.4x5mm_P0.65mm - 3D model: TSSOP-16 (KiCad packages3D, STEP)
- 3D model files:
sn74hct138pwr-etched.step/sn74hct138pwr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sn74hct138pwr.step/sn74hct138pwr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (28 pp, sha256
a0bbbcc2ac42625a, retrieved 2026-10-06, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).