# 74LCX244MTCX

**onsemi** · Buffers, Drivers, Receivers, Transceivers · TSSOP-20

74LCX244MTCX 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 | OE1 | input | Active-low 3-STATE output enable for outputs O0-O3 (pins 18, 16, 14, 12); HIGH puts them in high impedance, and the input is 5V tolerant (VI 0 to 5.5V). |
| 2 | I0 | input | Data input 0, 5V tolerant (VI 0 to 5.5V), buffered non-inverting to O0 when OE1 is LOW. |
| 3 | O4 | tri_state | 3-STATE output 4 following I4, enabled when OE2 is LOW, with ±24mA drive at VCC = 3.0-3.6V. |
| 4 | I1 | input | Data input 1, 5V tolerant (VI 0 to 5.5V), buffered non-inverting to O1 when OE1 is LOW. |
| 5 | O5 | tri_state | 3-STATE output 5 following I5, enabled when OE2 is LOW, with ±24mA drive at VCC = 3.0-3.6V. |
| 6 | I2 | input | Data input 2, 5V tolerant (VI 0 to 5.5V), buffered non-inverting to O2 when OE1 is LOW. |
| 7 | O6 | tri_state | 3-STATE output 6 following I6, enabled when OE2 is LOW, with ±24mA drive at VCC = 3.0-3.6V. |
| 8 | I3 | input | Data input 3, 5V tolerant (VI 0 to 5.5V), buffered non-inverting to O3 when OE1 is LOW. |
| 9 | O7 | tri_state | 3-STATE output 7 following I7, enabled when OE2 is LOW, with ±24mA drive at VCC = 3.0-3.6V. |
| 10 | GND | power_in | Ground pin (0V reference). |
| 11 | I7 | input | Data input 7, 5V tolerant (VI 0 to 5.5V), buffered non-inverting to O7 when OE2 is LOW. |
| 12 | O3 | tri_state | 3-STATE output 3 following I3, enabled when OE1 is LOW, with ±24mA drive at VCC = 3.0-3.6V. |
| 13 | I6 | input | Data input 6, 5V tolerant (VI 0 to 5.5V), buffered non-inverting to O6 when OE2 is LOW. |
| 14 | O2 | tri_state | 3-STATE output 2 following I2, enabled when OE1 is LOW, with ±24mA drive at VCC = 3.0-3.6V. |
| 15 | I5 | input | Data input 5, 5V tolerant (VI 0 to 5.5V), buffered non-inverting to O5 when OE2 is LOW. |
| 16 | O1 | tri_state | 3-STATE output 1 following I1, enabled when OE1 is LOW, with ±24mA drive at VCC = 3.0-3.6V. |
| 17 | I4 | input | Data input 4, 5V tolerant (VI 0 to 5.5V), buffered non-inverting to O4 when OE2 is LOW. |
| 18 | O0 | tri_state | 3-STATE output 0 following I0, enabled when OE1 is LOW, with ±24mA drive at VCC = 3.0-3.6V. |
| 19 | OE2 | input | Active-low 3-STATE output enable for outputs O4-O7 (pins 3, 5, 7, 9); HIGH puts them in high impedance, and the input is 5V tolerant (VI 0 to 5.5V). |
| 20 | VCC | power_in | Supply voltage, 2.0V to 3.6V recommended operating (2.3V to 3.6V specified), absolute maximum −0.5V to +7.0V. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `74LCX244MTCX`
- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`
- 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files: `74lcx244mtcx-etched.step` / `74lcx244mtcx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `74lcx244mtcx.step` / `74lcx244mtcx.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588881513299513344) (16 pp, sha256 `7e26c398f50b3023`, retrieved 2026-10-09, tier: lcsc)
- **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/74lcx244mtcx-datasheet.pdf)