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SN74AHCT138DR
Public Made by Adomby adom
Texas Instruments Signal Switches, Multiplexers, Decoders, SOIC-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
markdownSN74AHCT138DR
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sn74ahct138dr.step/sn74ahct138dr.glbare 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, primaryclaude-haiku-5-5(text), consensusclaude-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).