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SN74LVC138AQDRG4Q1

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Texas Instruments Signal Switches, Multiplexers, Decoders, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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SN74LVC138AQDRG4Q1

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

SN74LVC138AQDRG4Q1 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 Binary-select address input (least significant bit); inputs accept voltages up to 5.5 V and can be driven from 3.3 V or 5 V devices.
2 B input Binary-select address input (middle bit); inputs accept voltages up to 5.5 V and can be driven from 3.3 V or 5 V devices.
3 C input Binary-select address input (most significant bit); inputs accept voltages up to 5.5 V and can be driven from 3.3 V or 5 V devices.
4 G2A input Active-low enable input; it must be low, together with G2B low and G1 high, for the decoder to select an output.
5 G2B input Active-low enable input; it must be low, together with G2A low and G1 high, for the decoder to select an output.
6 G1 input Active-high enable input; it must be high, with G2A and G2B low, for the decoder to select an output.
7 Y7 output Active-low decoder output that goes low only when A, B, C = H, H, H and all enables are active; otherwise it stays high.
8 GND power_in Ground reference for the device.
9 Y6 output Active-low decoder output that goes low only when A, B, C = L, H, H and all enables are active; otherwise it stays high.
10 Y5 output Active-low decoder output that goes low only when A, B, C = H, L, H and all enables are active; otherwise it stays high.
11 Y4 output Active-low decoder output that goes low only when A, B, C = L, L, H and all enables are active; otherwise it stays high.
12 Y3 output Active-low decoder output that goes low only when A, B, C = H, H, L and all enables are active; otherwise it stays high.
13 Y2 output Active-low decoder output that goes low only when A, B, C = L, H, L and all enables are active; otherwise it stays high.
14 Y1 output Active-low decoder output that goes low only when A, B, C = H, L, L and all enables are active; otherwise it stays high.
15 Y0 output Active-low decoder output that goes low only when A, B, C = L, L, L and all enables are active; otherwise it stays high.
16 VCC power_in Supply voltage; the recommended operating range is 2 V to 3.6 V.

Key specifications

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

CAD (KiCad official)

  • Symbol: SN74LVC138AQDRG4Q1
  • Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
  • 3D model: SOIC-16 (KiCad packages3D, STEP)
  • 3D model files: sn74lvc138aqdrg4q1-etched.step / sn74lvc138aqdrg4q1-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74lvc138aqdrg4q1.step / sn74lvc138aqdrg4q1.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (14 pp, sha256 475d05357e72f862, retrieved 2026-10-08, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF