# SN74LS283D

**Texas Instruments** · Specialty Logic · SOIC-16

SN74LS283D 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 | Σ2 | output | Sum output for bit 2 of the 4-bit adder. |
| 2 | B2 | input | Addend input B for bit 2. |
| 3 | A2 | input | Addend input A for bit 2. |
| 4 | Σ1 | output | Sum output for bit 1 of the 4-bit adder. |
| 5 | A1 | input | Addend input A for bit 1. |
| 6 | B1 | input | Addend input B for bit 1. |
| 7 | C0 | input | Carry input to the least significant bit. |
| 8 | GND | power_in | Ground terminal, the network ground reference for all voltages. |
| 9 | C4 | output | Carry output from the fourth bit. |
| 10 | Σ4 | output | Sum output for bit 4 of the 4-bit adder. |
| 11 | B4 | input | Addend input B for bit 4. |
| 12 | A4 | input | Addend input A for bit 4. |
| 13 | Σ3 | output | Sum output for bit 3 of the 4-bit adder. |
| 14 | A3 | input | Addend input A for bit 3. |
| 15 | B3 | input | Addend input B for bit 3. |
| 16 | VCC | power_in | Supply voltage; absolute maximum rating is 7 V. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `SN74LS283D`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files: `sn74ls283d-etched.step` / `sn74ls283d-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74ls283d.step` / `sn74ls283d.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/sn74s283) (12 pp, sha256 `217d23c27795e496`, retrieved 2026-10-12, tier: lcsc)
- **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/sn74ls283d-datasheet.pdf)