# 74LCX541MTC

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

74LCX541MTC 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 | 3-STATE output enable input; when HIGH the O0-O3 outputs are high impedance, and OE1 should be tied to VCC through a pull-up resistor to hold the outputs in high impedance during power up or down. |
| 2 | I0 | input | Data input 0, 5V tolerant; VI may range from 0 to 5.5V, and unused inputs must be held HIGH or LOW, never left floating. |
| 3 | I1 | input | Data input 1, 5V tolerant; VI may range from 0 to 5.5V, and unused inputs must be held HIGH or LOW, never left floating. |
| 4 | I2 | input | Data input 2, 5V tolerant; VI may range from 0 to 5.5V, and unused inputs must be held HIGH or LOW, never left floating. |
| 5 | I3 | input | Data input 3, 5V tolerant; VI may range from 0 to 5.5V, and unused inputs must be held HIGH or LOW, never left floating. |
| 6 | I4 | input | Data input 4, 5V tolerant; VI may range from 0 to 5.5V, and unused inputs must be held HIGH or LOW, never left floating. |
| 7 | I5 | input | Data input 5, 5V tolerant; VI may range from 0 to 5.5V, and unused inputs must be held HIGH or LOW, never left floating. |
| 8 | I6 | input | Data input 6, 5V tolerant; VI may range from 0 to 5.5V, and unused inputs must be held HIGH or LOW, never left floating. |
| 9 | I7 | input | Data input 7, 5V tolerant; VI may range from 0 to 5.5V, and unused inputs must be held HIGH or LOW, never left floating. |
| 10 | GND | power_in | Ground reference for the device. |
| 11 | O7 | output | 3-STATE data output 7; output drive is ±24 mA at VCC = 3.0V to 3.6V. |
| 12 | O6 | output | 3-STATE data output 6; output drive is ±24 mA at VCC = 3.0V to 3.6V. |
| 13 | O5 | output | 3-STATE data output 5; output drive is ±24 mA at VCC = 3.0V to 3.6V. |
| 14 | O4 | output | 3-STATE data output 4; output drive is ±24 mA at VCC = 3.0V to 3.6V. |
| 15 | O3 | output | 3-STATE data output 3; output drive is ±24 mA at VCC = 3.0V to 3.6V. |
| 16 | O2 | output | 3-STATE data output 2; output drive is ±24 mA at VCC = 3.0V to 3.6V. |
| 17 | O1 | output | 3-STATE data output 1; output drive is ±24 mA at VCC = 3.0V to 3.6V. |
| 18 | O0 | output | 3-STATE data output 0; output drive is ±24 mA at VCC = 3.0V to 3.6V. |
| 19 | OE2 | input | 3-STATE output enable input; when HIGH the O4-O7 outputs are high impedance, and OE2 should be tied to VCC through a pull-up resistor to hold the outputs in high impedance during power up or down. |
| 20 | VCC | power_in | Supply voltage, 2.0V to 3.6V operating (data retention 1.5V to 3.6V). |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `74LCX541MTC`
- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`
- 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files: `74lcx541mtc-etched.step` / `74lcx541mtc-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `74lcx541mtc.step` / `74lcx541mtc.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/74lcx541mtc-d.pdf) (16 pp, sha256 `c02459daf87adc8e`, retrieved 2026-10-30, tier: manufacturer)
- **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/74lcx541mtc-datasheet.pdf)