# CD74HC251M96

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

CD74HC251M96 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 | I3 | input | Data input 3, routed to Y and Y-bar when select code S2S1S0 = LHH and OE is low. |
| 2 | I2 | input | Data input 2, routed to Y and Y-bar when select code S2S1S0 = LHL and OE is low. |
| 3 | I1 | input | Data input 1, routed to Y and Y-bar when select code S2S1S0 = LLH and OE is low. |
| 4 | I0 | input | Data input 0, routed to Y and Y-bar when select code S2S1S0 = LLL and OE is low. |
| 5 | Y | tri_state | True three-state output that follows the selected data input and is high-impedance when OE is high. |
| 6 | Y̅ | tri_state | Complementary three-state output that is the inverse of the selected data input and is high-impedance when OE is high. |
| 7 | OE̅ | input | Active-low output enable; must be low to enable the device and puts both outputs in high-impedance when high. |
| 8 | GND | power_in | Ground pin. |
| 9 | S2 | input | Data select input, most significant bit of the 3-bit address that selects one of eight data inputs. |
| 10 | S1 | input | Data select input, middle bit of the 3-bit address that selects one of eight data inputs. |
| 11 | S0 | input | Data select input, least significant bit of the 3-bit address that selects one of eight data inputs. |
| 12 | I7 | input | Data input 7, routed to Y and Y-bar when select code S2S1S0 = HHH and OE is low. |
| 13 | I6 | input | Data input 6, routed to Y and Y-bar when select code S2S1S0 = HHL and OE is low. |
| 14 | I5 | input | Data input 5, routed to Y and Y-bar when select code S2S1S0 = HLH and OE is low. |
| 15 | I4 | input | Data input 4, routed to Y and Y-bar when select code S2S1S0 = HLL and OE is low. |
| 16 | VCC | power_in | Supply voltage, 2 V to 6 V for HC types, with a 0.1-uF bypass capacitor recommended. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `CD74HC251M96`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files: `cd74hc251m96-etched.step` / `cd74hc251m96-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cd74hc251m96.step` / `cd74hc251m96.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/cd74hct251) (21 pp, sha256 `fc13f4be219dfc83`, retrieved 2026-10-12, 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 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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](docs/cd74hc251m96-datasheet.pdf)