# SN74ALS151DR

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

SN74ALS151DR from Texas Instruments, in a SOP-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 | D3 | input | Data input D3 is selected when C, B, A = L, H, H, and its level appears on Y and W while G is low. |
| 2 | D2 | input | Data input D2 is selected when C, B, A = L, H, L, and its level appears on Y and W while G is low. |
| 3 | D1 | input | Data input D1 is selected when C, B, A = L, L, H, and its level appears on Y and W while G is low. |
| 4 | D0 | input | Data input D0 is selected when C, B, A = L, L, L, and its level appears on Y and W while G is low. |
| 5 | Y | output | Output Y follows the selected data input and is forced low when the strobe G is high. |
| 6 | W | output | Output W follows the selected data input and is forced high when the strobe G is high. |
| 7 | G | input | Active-low strobe that must be at a low logic level to enable the data inputs; a high level forces W high and Y low. |
| 8 | GND | power_in | Ground reference pin for the device. |
| 9 | C | input | Binary select input C (most significant select bit) that chooses among D0 to D7 together with B and A. |
| 10 | B | input | Binary select input B that chooses among D0 to D7 together with C and A. |
| 11 | A | input | Binary select input A (least significant select bit) that chooses among D0 to D7 together with B and C. |
| 12 | D7 | input | Data input D7 is selected when C, B, A = H, H, H, and its level appears on Y and W while G is low. |
| 13 | D6 | input | Data input D6 is selected when C, B, A = H, H, L, and its level appears on Y and W while G is low. |
| 14 | D5 | input | Data input D5 is selected when C, B, A = H, L, H, and its level appears on Y and W while G is low. |
| 15 | D4 | input | Data input D4 is selected when C, B, A = H, L, L, and its level appears on Y and W while G is low. |
| 16 | VCC | power_in | Supply voltage, recommended 4.5 V to 5.5 V with 7 V absolute maximum. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `SN74ALS151DR`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOP-16 (KiCad packages3D, STEP)
- 3D model files: `sn74als151dr-etched.step` / `sn74als151dr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74als151dr.step` / `sn74als151dr.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/lit/ds/symlink/sn74als151.pdf) (18 pp, sha256 `6a4d43338cadcf8e`, retrieved 2026-10-11, 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](docs/sn74als151dr-datasheet.pdf)