component
CD74AC257M
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
markdownCD74AC257M
Texas Instruments · Signal Switches, Multiplexers, Decoders · SOIC-16
CD74AC257M 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 | S | input | Select input; routes channel I0 to output when low, channel I1 to output when high. |
| 2 | 1I0 | input | Channel 1 input 0; data input selected to 1Y output when select pin is low. |
| 3 | 1I1 | input | Channel 1 input 1; data input selected to 1Y output when select pin is high. |
| 4 | 1Y | tri_state | Channel 1 output; tri-state multiplexed output driven by selected input and controlled by output enable. |
| 5 | 2I0 | input | Channel 2 input 0; data input selected to 2Y output when select pin is low. |
| 6 | 2I1 | input | Channel 2 input 1; data input selected to 2Y output when select pin is high. |
| 7 | 2Y | tri_state | Channel 2 output; tri-state multiplexed output driven by selected input and controlled by output enable. |
| 8 | GND | power_in | Ground; reference voltage for all signal and power pins. |
| 9 | 3Y | tri_state | Channel 3 output; tri-state multiplexed output driven by selected input and controlled by output enable. |
| 10 | 3I1 | input | Channel 3 input 1; data input selected to 3Y output when select pin is high. |
| 11 | 3I0 | input | Channel 3 input 0; data input selected to 3Y output when select pin is low. |
| 12 | 4Y | tri_state | Channel 4 output; tri-state multiplexed output driven by selected input and controlled by output enable. |
| 13 | 4I1 | input | Channel 4 input 1; data input selected to 4Y output when select pin is high. |
| 14 | 4I0 | input | Channel 4 input 0; data input selected to 4Y output when select pin is low. |
| 15 | OE | input | Output enable, active low; when high forces all outputs to high impedance state regardless of inputs. |
| 16 | VCC | power_in | Positive power supply; 1.5V to 5.5V operating range for AC type, temperature range -55°C to 125°C. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16 |
| Category | Logic |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
CD74AC257M - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files:
cd74ac257m-etched.step/cd74ac257m-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);cd74ac257m.step/cd74ac257m.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (29 pp, sha256
f4d61e0b521229dd, retrieved 2026-09-27, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-4-6(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).