# 74ACT541SCX

**onsemi** · Buffers / Drivers · SOIC-20-300mil

74ACT541SCX from onsemi, in a SOIC-20-300mil. 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 input 1; outputs are high impedance when OE1 or OE2 is HIGH. |
| 2 | I0 | input | Data input 0, buffered non-inverting to output O0 (ACT541 inputs are TTL-compatible). |
| 3 | I1 | input | Data input 1, buffered non-inverting to output O1 (ACT541 inputs are TTL-compatible). |
| 4 | I2 | input | Data input 2, buffered non-inverting to output O2 (ACT541 inputs are TTL-compatible). |
| 5 | I3 | input | Data input 3, buffered non-inverting to output O3 (ACT541 inputs are TTL-compatible). |
| 6 | I4 | input | Data input 4, buffered non-inverting to output O4 (ACT541 inputs are TTL-compatible). |
| 7 | I5 | input | Data input 5, buffered non-inverting to output O5 (ACT541 inputs are TTL-compatible). |
| 8 | I6 | input | Data input 6, buffered non-inverting to output O6 (ACT541 inputs are TTL-compatible). |
| 9 | I7 | input | Data input 7, buffered non-inverting to output O7 (ACT541 inputs are TTL-compatible). |
| 10 | GND | power_in | Ground reference pin for the device. |
| 11 | O7 | tri_state | 3-STATE data output 7 with 24mA source/sink capability, high impedance when disabled. |
| 12 | O6 | tri_state | 3-STATE data output 6 with 24mA source/sink capability, high impedance when disabled. |
| 13 | O5 | tri_state | 3-STATE data output 5 with 24mA source/sink capability, high impedance when disabled. |
| 14 | O4 | tri_state | 3-STATE data output 4 with 24mA source/sink capability, high impedance when disabled. |
| 15 | O3 | tri_state | 3-STATE data output 3 with 24mA source/sink capability, high impedance when disabled. |
| 16 | O2 | tri_state | 3-STATE data output 2 with 24mA source/sink capability, high impedance when disabled. |
| 17 | O1 | tri_state | 3-STATE data output 1 with 24mA source/sink capability, high impedance when disabled. |
| 18 | O0 | tri_state | 3-STATE data output 0 with 24mA source/sink capability, high impedance when disabled. |
| 19 | OE2 | input | Active-low 3-STATE output enable input 2; outputs are high impedance when OE1 or OE2 is HIGH. |
| 20 | VCC | power_in | Supply voltage pin; ACT devices operate from 4.5V to 5.5V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOIC-20-300mil |
| Category | Logic ICs |
| Pins | 20 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| housing | PC |  | 74AC541PC N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide | 2 |

## CAD (KiCad official)

- Symbol: `74ACT541SCX`
- Footprint: `Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm`
- 3D model: SOIC-20-300mil (KiCad packages3D, STEP)
- 3D model files: `74act541scx-etched.step` / `74act541scx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `74act541scx.step` / `74act541scx.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/74act541scx-d.pdf) (13 pp, sha256 `ffb108491aac3765`, retrieved 2026-10-28, 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/74act541scx-datasheet.pdf)