# SN74HCT574DWR

**Texas Instruments** · Flip Flops · SOIC-20-300mil

SN74HCT574DWR from Texas Instruments, 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 | 1OE | input | Output Enable input for the first group of flip-flops, active low |
| 2 | 1A1 | input | Data input 1A1 for the first flip-flop of the first group |
| 3 | 2Y4 | tri_state | Tri-state output 2Y4 of the fourth flip-flop in the second group |
| 4 | 1A2 | input | Data input 1A2 for the second flip-flop of the first group |
| 5 | 2Y3 | tri_state | Tri-state output 2Y3 of the third flip-flop in the second group |
| 6 | 1A3 | input | Data input 1A3 for the third flip-flop of the first group |
| 7 | 2Y2 | tri_state | Tri-state output 2Y2 of the second flip-flop in the second group |
| 8 | 1A4 | input | Data input 1A4 for the fourth flip-flop of the first group |
| 9 | 2Y1 | tri_state | Tri-state output 2Y1 of the first flip-flop in the second group |
| 10 | GND | power_in | Ground connection |
| 11 | 2A1 | input | Data input 2A1 for the first flip-flop of the second group |
| 12 | 1Y4 | tri_state | Tri-state output 1Y4 of the fourth flip-flop in the first group |
| 13 | 2A2 | input | Data input 2A2 for the second flip-flop of the second group |
| 14 | 1Y3 | tri_state | Tri-state output 1Y3 of the third flip-flop in the first group |
| 15 | 2A3 | input | Data input 2A3 for the third flip-flop of the second group |
| 16 | 1Y2 | tri_state | Tri-state output 1Y2 of the second flip-flop in the first group |
| 17 | 2A4 | input | Data input 2A4 for the fourth flip-flop of the second group |
| 18 | 1Y1 | tri_state | Tri-state output 1Y1 of the first flip-flop in the first group |
| 19 | 2OE | input | Output Enable input for the second group of flip-flops, active low |
| 20 | VCC | power_in | Positive power supply voltage, 4.5V to 5.5V |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-20-300mil |
| Category | Logic |
| Pins | 20 |

## CAD (KiCad official)

- Symbol: `SN74HCT574DWR`
- Footprint: `Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm`
- 3D model: SOIC-20-300mil (KiCad packages3D, STEP)
- 3D model files: `sn74hct574dwr-etched.step` / `sn74hct574dwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74hct574dwr.step` / `sn74hct574dwr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/sn74hct574) (30 pp, sha256 `3288661ec63c48f4`, retrieved 2026-10-05, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (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/sn74hct574dwr-datasheet.pdf)