# SN74AHCT245DBR

**Texas Instruments** · Buffers, Drivers, Receivers, Transceivers · SSOP-20-208mil

SN74AHCT245DBR from Texas Instruments, in a SSOP-20-208mil. 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 for the octal bus transceiver; the datasheet excerpt gives no logic-level or polarity detail for this pin. |
| 2 | A1 | bidirectional | A1 input/output of the octal bus transceiver; absolute maximum continuous output current is ±25 mA for VO = 0 to VCC. |
| 3 | A2 | bidirectional | A2 input/output of the octal bus transceiver; absolute maximum continuous output current is ±25 mA for VO = 0 to VCC. |
| 4 | A3 | bidirectional | A3 input/output of the octal bus transceiver; absolute maximum continuous output current is ±25 mA for VO = 0 to VCC. |
| 5 | A4 | bidirectional | A4 input/output of the octal bus transceiver; absolute maximum continuous output current is ±25 mA for VO = 0 to VCC. |
| 6 | A5 | bidirectional | A5 input/output of the octal bus transceiver; absolute maximum continuous output current is ±25 mA for VO = 0 to VCC. |
| 7 | A6 | bidirectional | A6 input/output of the octal bus transceiver; absolute maximum continuous output current is ±25 mA for VO = 0 to VCC. |
| 8 | A7 | bidirectional | A7 input/output of the octal bus transceiver; absolute maximum continuous output current is ±25 mA for VO = 0 to VCC. |
| 9 | A8 | bidirectional | A8 input/output of the octal bus transceiver; absolute maximum continuous output current is ±25 mA for VO = 0 to VCC. |
| 10 | GND | power_in | Ground pin; continuous current through VCC or GND is limited to ±75 mA in absolute maximum ratings. |
| 11 | B8 | bidirectional | B8 input/output of the octal bus transceiver; absolute maximum continuous output current is ±25 mA for VO = 0 to VCC. |
| 12 | B7 | bidirectional | B7 input/output of the octal bus transceiver; absolute maximum continuous output current is ±25 mA for VO = 0 to VCC. |
| 13 | B6 | bidirectional | B6 input/output of the octal bus transceiver; absolute maximum continuous output current is ±25 mA for VO = 0 to VCC. |
| 14 | B5 | bidirectional | B5 input/output of the octal bus transceiver; absolute maximum continuous output current is ±25 mA for VO = 0 to VCC. |
| 15 | B4 | bidirectional | B4 input/output of the octal bus transceiver; absolute maximum continuous output current is ±25 mA for VO = 0 to VCC. |
| 16 | B3 | bidirectional | B3 input/output of the octal bus transceiver; absolute maximum continuous output current is ±25 mA for VO = 0 to VCC. |
| 17 | B2 | bidirectional | B2 input/output of the octal bus transceiver; absolute maximum continuous output current is ±25 mA for VO = 0 to VCC. |
| 18 | B1 | bidirectional | B1 input/output of the octal bus transceiver; absolute maximum continuous output current is ±25 mA for VO = 0 to VCC. |
| 19 | OE | input | Output enable input for the transceiver; the datasheet excerpt gives no polarity or timing detail for this pin. |
| 20 | VCC | power_in | Positive supply pin; recommended supply range is 4.5 V to 5.5 V, with absolute maximum supply voltage of -0.5 V to 7 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SSOP-20-208mil |
| Category | Logic |
| Pins | 20 |

## CAD (KiCad official)

- Symbol: `SN74AHCT245DBR`
- Footprint: `Package_SO:SSOP-20_5.3x7.2mm_P0.65mm`
- 3D model: SSOP-20-208mil (KiCad packages3D, STEP)
- 3D model files: `sn74ahct245dbr-etched.step` / `sn74ahct245dbr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74ahct245dbr.step` / `sn74ahct245dbr.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 `0929f5fab514d31a`, retrieved 2026-10-11, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/sn74ahct245dbr-datasheet.pdf)