# SN74AHCT245DWR

**Texas Instruments** · Buffers, Drivers, Receivers, Transceivers · SOIC-20-300mil

SN74AHCT245DWR from Texas Instruments, in a SOIC-20-300mil. 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 | DIR | input | Direction control input. |
| 2 | A1 | bidirectional | Bidirectional bus A data line 1, TTL-compatible input. |
| 3 | A2 | bidirectional | Bidirectional bus A data line 2, TTL-compatible input. |
| 4 | A3 | bidirectional | Bidirectional bus A data line 3, TTL-compatible input. |
| 5 | A4 | bidirectional | Bidirectional bus A data line 4, TTL-compatible input. |
| 6 | A5 | bidirectional | Bidirectional bus A data line 5, TTL-compatible input. |
| 7 | A6 | bidirectional | Bidirectional bus A data line 6, TTL-compatible input. |
| 8 | A7 | bidirectional | Bidirectional bus A data line 7, TTL-compatible input. |
| 9 | A8 | bidirectional | Bidirectional bus A data line 8, TTL-compatible input. |
| 10 | GND | power_in | Ground reference connection. |
| 11 | B8 | bidirectional | Bidirectional bus B data line 8, 3-state output. |
| 12 | B7 | bidirectional | Bidirectional bus B data line 7, 3-state output. |
| 13 | B6 | bidirectional | Bidirectional bus B data line 6, 3-state output. |
| 14 | B5 | bidirectional | Bidirectional bus B data line 5, 3-state output. |
| 15 | B4 | bidirectional | Bidirectional bus B data line 4, 3-state output. |
| 16 | B3 | bidirectional | Bidirectional bus B data line 3, 3-state output. |
| 17 | B2 | bidirectional | Bidirectional bus B data line 2, 3-state output. |
| 18 | B1 | bidirectional | Bidirectional bus B data line 1, 3-state output. |
| 19 | OE | input | Output enable control input. |
| 20 | VCC | power_in | Positive power supply, operating range 4.5V to 5.5V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-20-300mil |
| Category | Logic |
| Pins | 20 |

## CAD (KiCad official)

- Symbol: `SN74AHCT245DWR`
- Footprint: `Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm`
- 3D model: SOIC-20-300mil (KiCad packages3D, STEP)
- 3D model files: `sn74ahct245dwr-etched.step` / `sn74ahct245dwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74ahct245dwr.step` / `sn74ahct245dwr.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/sn74ahct245) (41 pp, sha256 `9e1ded06a2c7c7a2`, retrieved 2026-10-06, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (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/sn74ahct245dwr-datasheet.pdf)