# CD74AC257M96

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

CD74AC257M96 from Texas Instruments, in a SOIC-16. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | S | input | Select input. Chooses which data input (I0 or I1) is routed to each Y output. When S=L, I0 is selected; when S=H, I1 is selected (with OE low). |
| 2 | 1I0 | input | Channel 1, data input 0. Routed to 1Y when S=L and OE=L. |
| 3 | 1I1 | input | Channel 1, data input 1. Routed to 1Y when S=H and OE=L. |
| 4 | 1Y | tri_state | Channel 1 mux output (non-inverting). 3-state; Hi-Z when OE=H. ±24 mA drive at VCC=4.5 V. |
| 5 | 2I0 | input | Channel 2, data input 0. Routed to 2Y when S=L and OE=L. |
| 6 | 2I1 | input | Channel 2, data input 1. Routed to 2Y when S=H and OE=L. |
| 7 | 2Y | tri_state | Channel 2 mux output (non-inverting). 3-state; Hi-Z when OE=H. ±24 mA drive at VCC=4.5 V. |
| 8 | GND | power_in | Ground reference (0 V) for the device. |
| 9 | 3Y | tri_state | Channel 3 mux output (non-inverting). 3-state; Hi-Z when OE=H. ±24 mA drive at VCC=4.5 V. |
| 10 | 3I1 | input | Channel 3, data input 1. Routed to 3Y when S=H and OE=L. |
| 11 | 3I0 | input | Channel 3, data input 0. Routed to 3Y when S=L and OE=L. |
| 12 | 4Y | tri_state | Channel 4 mux output (non-inverting). 3-state; Hi-Z when OE=H. ±24 mA drive at VCC=4.5 V. |
| 13 | 4I1 | input | Channel 4, data input 1. Routed to 4Y when S=H and OE=L. |
| 14 | 4I0 | input | Channel 4, data input 0. Routed to 4Y when S=L and OE=L. |
| 15 | ~{OE} | input | Output Enable, active low. When OE=L the selected data appears at the Y outputs; when OE=H, all Y outputs are placed in a high-impedance (3-state) state regardless of S/I inputs. |
| 16 | VCC | power_in | Positive supply voltage. AC type: 1.5 V to 5.5 V; ACT type: 4.5 V to 5.5 V. Absolute max 6 V. Decouple with 0.1 µF (and optional 1 µF in parallel) close to the pin. |

## Key specifications

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

## Ordering variants

Same part, different packaging or reel option.

- `CD74AC257M96`
- `CD74AC257M96M`
- `CD74AC257M96E`
- `CD74AC257M96EE4`
- `CD74AC257M96PWR`
- `CD74AC257M96BQBR`
- `CD74AC257M96F3A`

## CAD (KiCad official)

- Symbol: `CD74AC257M96`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files: `cd74ac257m96-etched.step` / `cd74ac257m96-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cd74ac257m96.step` / `cd74ac257m96.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/cd74ac257) (None pp, sha256 `93b8394a9f142d39`, retrieved 2026-08-17, 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:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/cd74ac257m96-datasheet.pdf)