# MC74AC573DTR2G

**onsemi** · Latches · TSSOP-20

MC74AC573DTR2G 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 | OE | input | 3-state output enable input; when LOW the output buffers are enabled, and when HIGH the outputs are high impedance without blocking new data from entering the latches. |
| 2 | D0 | input | Data input 0 that enters the latch while LE is HIGH. |
| 3 | D1 | input | Data input 1 that enters the latch while LE is HIGH. |
| 4 | D2 | input | Data input 2 that enters the latch while LE is HIGH. |
| 5 | D3 | input | Data input 3 that enters the latch while LE is HIGH. |
| 6 | D4 | input | Data input 4 that enters the latch while LE is HIGH. |
| 7 | D5 | input | Data input 5 that enters the latch while LE is HIGH. |
| 8 | D6 | input | Data input 6 that enters the latch while LE is HIGH. |
| 9 | D7 | input | Data input 7 that enters the latch while LE is HIGH. |
| 10 | GND | power_in | Ground reference for the supply and all input/output voltages. |
| 11 | LE | input | Latch enable input; latches are transparent when HIGH and store the data present at the HIGH-to-LOW transition when LOW. |
| 12 | O7 | tri_state | 3-state latch output 7 that sources/sinks 24 mA and is high impedance when OE is HIGH. |
| 13 | O6 | tri_state | 3-state latch output 6 that sources/sinks 24 mA and is high impedance when OE is HIGH. |
| 14 | O5 | tri_state | 3-state latch output 5 that sources/sinks 24 mA and is high impedance when OE is HIGH. |
| 15 | O4 | tri_state | 3-state latch output 4 that sources/sinks 24 mA and is high impedance when OE is HIGH. |
| 16 | O3 | tri_state | 3-state latch output 3 that sources/sinks 24 mA and is high impedance when OE is HIGH. |
| 17 | O2 | tri_state | 3-state latch output 2 that sources/sinks 24 mA and is high impedance when OE is HIGH. |
| 18 | O1 | tri_state | 3-state latch output 1 that sources/sinks 24 mA and is high impedance when OE is HIGH. |
| 19 | O0 | tri_state | 3-state latch output 0 that sources/sinks 24 mA and is high impedance when OE is HIGH. |
| 20 | VCC | power_in | Positive supply; recommended 2.0 V to 6.0 V for 'AC and 4.5 V to 5.5 V for 'ACT, absolute maximum -0.5 V to +7.0 V. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `MC74AC573DTR2G`
- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`
- 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files: `mc74ac573dtr2g-etched.step` / `mc74ac573dtr2g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mc74ac573dtr2g.step` / `mc74ac573dtr2g.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/mc74ac573dtr2-d.pdf) (11 pp, sha256 `607ffb8810b5687a`, retrieved 2026-10-20, 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/mc74ac573dtr2g-datasheet.pdf)