# SN74LS74AN

**Texas Instruments** · Flip Flops · PDIP-14

SN74LS74AN from Texas Instruments, in a PDIP-14. 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 | 1CLR | input | Active-low asynchronous clear for flip-flop 1; a low level resets the outputs regardless of the other inputs. |
| 2 | 1D | input | Data input of flip-flop 1, transferred to the outputs on the positive-going edge of the clock pulse. |
| 3 | 1CLK | input | Clock input of flip-flop 1, positive-edge triggered. |
| 4 | 1PRE | input | Active-low asynchronous preset for flip-flop 1; a low level sets the outputs regardless of the other inputs. |
| 5 | 1Q | output | True output of flip-flop 1. |
| 6 | 1Q̅ | output | Complementary output of flip-flop 1. |
| 7 | GND | power_in | Ground. |
| 8 | 2Q̅ | output | Complementary output of flip-flop 2. |
| 9 | 2Q | output | True output of flip-flop 2. |
| 10 | 2PRE | input | Active-low asynchronous preset for flip-flop 2; a low level sets the outputs regardless of the other inputs. |
| 11 | 2CLK | input | Clock input of flip-flop 2, positive-edge triggered. |
| 12 | 2D | input | Data input of flip-flop 2, transferred to the outputs on the positive-going edge of the clock pulse. |
| 13 | 2CLR | input | Active-low asynchronous clear for flip-flop 2; a low level resets the outputs regardless of the other inputs. |
| 14 | VCC | power_in | Positive supply voltage. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | PDIP-14 |
| Category | Logic |
| Pins | 14 |

## CAD (KiCad official)

- Symbol: `SN74LS74AN`
- Footprint: `Package_DIP:DIP-14_W7.62mm`
- 3D model: PDIP-14 (KiCad packages3D, STEP)
- 3D model files: `sn74ls74an-etched.step` / `sn74ls74an-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74ls74an.step` / `sn74ls74an.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/sn74ls74a) (30 pp, sha256 `3c67c755a4225573`, retrieved 2026-10-15, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (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/sn74ls74an-datasheet.pdf)