# SN74S140DR

**Texas Instruments** · Logic Gates · SOIC-14

SN74S140DR from Texas Instruments, in a SOIC-14. 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 | 1A | input | Input A of driver 1 (4-input positive-NAND, Y = ABCD inverted); input voltage max 5.5 V. |
| 2 | 1B | input | Input B of driver 1; input voltage max 5.5 V. |
| 3 | NC | unconnected | No internal connection. |
| 4 | 1C | input | Input C of driver 1; input voltage max 5.5 V. |
| 5 | 1D | input | Input D of driver 1; input voltage max 5.5 V. |
| 6 | 1Y | output | Output of driver 1, a 50-ohm line driver output implementing the NAND of 1A-1D. |
| 7 | GND | power_in | Ground; voltage values are specified with respect to this network ground terminal. |
| 8 | 2Y | output | Output of driver 2, a 50-ohm line driver output implementing the NAND of 2A-2D. |
| 9 | 2A | input | Input A of driver 2; input voltage max 5.5 V. |
| 10 | 2B | input | Input B of driver 2; input voltage max 5.5 V. |
| 11 | NC | unconnected | No internal connection. |
| 12 | 2C | input | Input C of driver 2; input voltage max 5.5 V. |
| 13 | 2D | input | Input D of driver 2; input voltage max 5.5 V. |
| 14 | VCC | power_in | Supply voltage; absolute maximum 7 V with respect to GND. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-14 |
| Category | Logic |
| Pins | 14 |

## CAD (KiCad official)

- Symbol: `SN74S140DR`
- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`
- 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files: `sn74s140dr-etched.step` / `sn74s140dr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74s140dr.step` / `sn74s140dr.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/sn74s140.pdf) (20 pp, sha256 `1843474d7d5037ec`, retrieved 2026-10-08, tier: manufacturer)
- **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/sn74s140dr-datasheet.pdf)