# 74VHC245PW

**Nexperia** · Buffer/Driver/Transceiver · TSSOP-20

74VHC245PW from Nexperia, in a TSSOP-20. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | DIR | input | Direction control input. When DIR=LOW, data flows from Bn to An; when DIR=HIGH, data flows from An to Bn (with OE=LOW). Schmitt-trigger input; accepts voltages higher than VCC. |
| 2 | A0 | bidirectional | Data input/output, bus A bit 0. Direction is controlled by DIR; outputs 3-state when OE is HIGH. |
| 3 | A1 | bidirectional | Data input/output, bus A bit 1. Direction is controlled by DIR; outputs 3-state when OE is HIGH. |
| 4 | A2 | bidirectional | Data input/output, bus A bit 2. Direction is controlled by DIR; outputs 3-state when OE is HIGH. |
| 5 | A3 | bidirectional | Data input/output, bus A bit 3. Direction is controlled by DIR; outputs 3-state when OE is HIGH. |
| 6 | A4 | bidirectional | Data input/output, bus A bit 4. Direction is controlled by DIR; outputs 3-state when OE is HIGH. |
| 7 | A5 | bidirectional | Data input/output, bus A bit 5. Direction is controlled by DIR; outputs 3-state when OE is HIGH. |
| 8 | A6 | bidirectional | Data input/output, bus A bit 6. Direction is controlled by DIR; outputs 3-state when OE is HIGH. |
| 9 | A7 | bidirectional | Data input/output, bus A bit 7. Direction is controlled by DIR; outputs 3-state when OE is HIGH. |
| 10 | GND | power_in | Ground reference, 0 V. |
| 11 | B7 | bidirectional | Data input/output, bus B bit 7. Direction is controlled by DIR; outputs 3-state when OE is HIGH. |
| 12 | B6 | bidirectional | Data input/output, bus B bit 6. Direction is controlled by DIR; outputs 3-state when OE is HIGH. |
| 13 | B5 | bidirectional | Data input/output, bus B bit 5. Direction is controlled by DIR; outputs 3-state when OE is HIGH. |
| 14 | B4 | bidirectional | Data input/output, bus B bit 4. Direction is controlled by DIR; outputs 3-state when OE is HIGH. |
| 15 | B3 | bidirectional | Data input/output, bus B bit 3. Direction is controlled by DIR; outputs 3-state when OE is HIGH. |
| 16 | B2 | bidirectional | Data input/output, bus B bit 2. Direction is controlled by DIR; outputs 3-state when OE is HIGH. |
| 17 | B1 | bidirectional | Data input/output, bus B bit 1. Direction is controlled by DIR; outputs 3-state when OE is HIGH. |
| 18 | B0 | bidirectional | Data input/output, bus B bit 0. Direction is controlled by DIR; outputs 3-state when OE is HIGH. |
| 19 | OE | input | Output enable input, active LOW. When HIGH, both A and B outputs are placed in high-impedance (3-state) OFF-state, effectively isolating the buses. |
| 20 | VCC | power_in | Supply voltage. Operating range 2.0 V to 5.5 V for 74VHC245; absolute max +7.0 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| Package | TSSOP-20 |
| Category | Logic |
| Pins | 20 |

## Ordering variants

Same part, different packaging or reel option.

- `74VHC245PW`
- `74VHC245PWD`
- `74VHC245PWBQ`

## CAD (KiCad official)

- Symbol: `74VHC245PW`
- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`
- 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files: `74vhc245pw-etched.step` / `74vhc245pw-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `74vhc245pw.step` / `74vhc245pw.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Nexperia datasheet](https://assets.nexperia.com/documents/data-sheet/74VHC245PW.pdf) (16 pp, sha256 `cffe9d1b2f02d399`, retrieved 2026-08-17, tier: manufacturer)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/74vhc245pw-datasheet.pdf)