# SN74LS148DR

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

SN74LS148DR 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 | 4 | input | Active-low data input 4 of the eight priority-encoded data lines. |
| 2 | 5 | input | Active-low data input 5 of the eight priority-encoded data lines. |
| 3 | 6 | input | Active-low data input 6 of the eight priority-encoded data lines. |
| 4 | 7 | input | Active-low data input 7, the highest-priority data line. |
| 5 | EI | input | Enable input for cascading; a high level forces all outputs high and a low level enables encoding. |
| 6 | A2 | output | Active-low address output A2 of the three-line (4-2-1) binary code. |
| 7 | A1 | output | Active-low address output A1 of the three-line (4-2-1) binary code. |
| 8 | GND | power_in | Ground. |
| 9 | A0 | output | Active-low address output A0 of the three-line (4-2-1) binary code. |
| 10 | 0 | input | Active-low data input 0, the lowest-priority data line. |
| 11 | 1 | input | Active-low data input 1 of the eight priority-encoded data lines. |
| 12 | 2 | input | Active-low data input 2 of the eight priority-encoded data lines. |
| 13 | 3 | input | Active-low data input 3 of the eight priority-encoded data lines. |
| 14 | GS | output | Active-low group select output that goes low when EI is low and any data input is low. |
| 15 | EO | output | Active-low enable output for cascading that goes low only when EI is low and all data inputs are high. |
| 16 | VCC | power_in | Positive supply voltage. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `SN74LS148DR`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files: `sn74ls148dr-etched.step` / `sn74ls148dr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74ls148dr.step` / `sn74ls148dr.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/sn74ls148.pdf) (28 pp, sha256 `51a9a41a1e0caacc`, retrieved 2026-10-07, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (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/sn74ls148dr-datasheet.pdf)