# 74LCX245MTC

**onsemi** · Buffers / Drivers · TSSOP-20

74LCX245MTC from onsemi, in a TSSOP-20. 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 | T/R | input | Transmit/Receive input that sets data direction: LOW sends B0-B7 data to A0-A7, HIGH sends A0-A7 data to B0-B7 (input voltage 0 to 5.5V). |
| 2 | A0 | bidirectional | Side A input or 3-STATE output, 5V tolerant (0 to 5.5V in 3-STATE), with ±24mA drive at VCC = 3.0V-3.6V. |
| 3 | A1 | bidirectional | Side A input or 3-STATE output, 5V tolerant (0 to 5.5V in 3-STATE), with ±24mA drive at VCC = 3.0V-3.6V. |
| 4 | A2 | bidirectional | Side A input or 3-STATE output, 5V tolerant (0 to 5.5V in 3-STATE), with ±24mA drive at VCC = 3.0V-3.6V. |
| 5 | A3 | bidirectional | Side A input or 3-STATE output, 5V tolerant (0 to 5.5V in 3-STATE), with ±24mA drive at VCC = 3.0V-3.6V. |
| 6 | A4 | bidirectional | Side A input or 3-STATE output, 5V tolerant (0 to 5.5V in 3-STATE), with ±24mA drive at VCC = 3.0V-3.6V. |
| 7 | A5 | bidirectional | Side A input or 3-STATE output, 5V tolerant (0 to 5.5V in 3-STATE), with ±24mA drive at VCC = 3.0V-3.6V. |
| 8 | A6 | bidirectional | Side A input or 3-STATE output, 5V tolerant (0 to 5.5V in 3-STATE), with ±24mA drive at VCC = 3.0V-3.6V. |
| 9 | A7 | bidirectional | Side A input or 3-STATE output, 5V tolerant (0 to 5.5V in 3-STATE), with ±24mA drive at VCC = 3.0V-3.6V. |
| 10 | GND | power_in | Ground pin (0V reference); DC ground current per ground pin is limited to ±100mA. |
| 11 | B7 | bidirectional | Side B input or 3-STATE output, 5V tolerant (0 to 5.5V in 3-STATE), with ±24mA drive at VCC = 3.0V-3.6V. |
| 12 | B6 | bidirectional | Side B input or 3-STATE output, 5V tolerant (0 to 5.5V in 3-STATE), with ±24mA drive at VCC = 3.0V-3.6V. |
| 13 | B5 | bidirectional | Side B input or 3-STATE output, 5V tolerant (0 to 5.5V in 3-STATE), with ±24mA drive at VCC = 3.0V-3.6V. |
| 14 | B4 | bidirectional | Side B input or 3-STATE output, 5V tolerant (0 to 5.5V in 3-STATE), with ±24mA drive at VCC = 3.0V-3.6V. |
| 15 | B3 | bidirectional | Side B input or 3-STATE output, 5V tolerant (0 to 5.5V in 3-STATE), with ±24mA drive at VCC = 3.0V-3.6V. |
| 16 | B2 | bidirectional | Side B input or 3-STATE output, 5V tolerant (0 to 5.5V in 3-STATE), with ±24mA drive at VCC = 3.0V-3.6V. |
| 17 | B1 | bidirectional | Side B input or 3-STATE output, 5V tolerant (0 to 5.5V in 3-STATE), with ±24mA drive at VCC = 3.0V-3.6V. |
| 18 | B0 | bidirectional | Side B input or 3-STATE output, 5V tolerant (0 to 5.5V in 3-STATE), with ±24mA drive at VCC = 3.0V-3.6V. |
| 19 | OE | input | Active-low Output Enable input; HIGH places both the A and B ports in high impedance, and it should be tied to VCC through a pull-up resistor to ensure high impedance during power up or down. |
| 20 | VCC | power_in | Positive supply, recommended operating range 2.0V to 3.6V (2.3V to 3.6V specified), absolute maximum -0.5V to +7.0V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | TSSOP-20 |
| Category | Logic ICs |
| Pins | 20 |

## CAD (KiCad official)

- Symbol: `74LCX245MTC`
- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`
- 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files: `74lcx245mtc-etched.step` / `74lcx245mtc-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `74lcx245mtc.step` / `74lcx245mtc.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/74lcx245mtc-d.pdf) (16 pp, sha256 `c74ef240db1532a3`, retrieved 2026-10-27, 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/74lcx245mtc-datasheet.pdf)