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74AC11257PW

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Texas Instruments Signal Switches, Multiplexers, Decoders, TSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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74AC11257PW

Texas Instruments · Signal Switches, Multiplexers, Decoders · TSSOP-20

74AC11257PW from Texas Instruments, in a TSSOP-20. 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/B input Common select input: a low level selects the 1A to 4A data inputs and a high level selects the 1B to 4B data inputs for the Y outputs.
2 1Y tri_state 3-state multiplexer output 1, which goes to high impedance when OE is high and is rated IOH -24 mA and IOL 24 mA at VCC 4.5 V to 5.5 V.
3 2Y tri_state 3-state multiplexer output 2, which goes to high impedance when OE is high and is rated IOH -24 mA and IOL 24 mA at VCC 4.5 V to 5.5 V.
4 GND power_in Ground pin; one of four center GND pins, a center-pin GND configuration that minimizes high-speed switching noise.
5 GND power_in Ground pin; one of four center GND pins, a center-pin GND configuration that minimizes high-speed switching noise.
6 GND power_in Ground pin; one of four center GND pins, a center-pin GND configuration that minimizes high-speed switching noise.
7 GND power_in Ground pin; one of four center GND pins, a center-pin GND configuration that minimizes high-speed switching noise.
8 3Y tri_state 3-state multiplexer output 3, which goes to high impedance when OE is high and is rated IOH -24 mA and IOL 24 mA at VCC 4.5 V to 5.5 V.
9 4Y tri_state 3-state multiplexer output 4, which goes to high impedance when OE is high and is rated IOH -24 mA and IOL 24 mA at VCC 4.5 V to 5.5 V.
10 OE input Output enable: a high level places all Y outputs in the high-impedance state, and it should be tied to VCC through a pullup resistor to ensure high-impedance during power up or power down.
11 4B input Data input 4B, selected onto output 4Y when A/B is high and OE is low; inputs must be held at VCC or GND when unused, with input voltage range 0 to VCC.
12 4A input Data input 4A, selected onto output 4Y when A/B is low and OE is low; inputs must be held at VCC or GND when unused, with input voltage range 0 to VCC.
13 3B input Data input 3B, selected onto output 3Y when A/B is high and OE is low; inputs must be held at VCC or GND when unused, with input voltage range 0 to VCC.
14 3A input Data input 3A, selected onto output 3Y when A/B is low and OE is low; inputs must be held at VCC or GND when unused, with input voltage range 0 to VCC.
15 VCC power_in Supply voltage pin; recommended operating range is 3 V to 5.5 V, and it is one of two center VCC pins.
16 VCC power_in Supply voltage pin; recommended operating range is 3 V to 5.5 V, and it is one of two center VCC pins.
17 2B input Data input 2B, selected onto output 2Y when A/B is high and OE is low; inputs must be held at VCC or GND when unused, with input voltage range 0 to VCC.
18 2A input Data input 2A, selected onto output 2Y when A/B is low and OE is low; inputs must be held at VCC or GND when unused, with input voltage range 0 to VCC.
19 1B input Data input 1B, selected onto output 1Y when A/B is high and OE is low; inputs must be held at VCC or GND when unused, with input voltage range 0 to VCC.
20 1A input Data input 1A, selected onto output 1Y when A/B is low and OE is low; inputs must be held at VCC or GND when unused, with input voltage range 0 to VCC.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package TSSOP-20
Category Logic
Pins 20

CAD (KiCad official)

  • Symbol: 74AC11257PW
  • Footprint: Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm
  • 3D model: TSSOP-20 (KiCad packages3D, STEP)
  • 3D model files: 74ac11257pw-etched.step / 74ac11257pw-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 74ac11257pw.step / 74ac11257pw.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (16 pp, sha256 954d25a63ab0eb82, retrieved 2026-10-08, tier: manufacturer)
  • 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