# SN74LS393DR

**Texas Instruments** · Counters, Dividers · SOIC-14

SN74LS393DR from Texas Instruments, in a SOIC-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 | 1A | input | Clock input of counter 1, advancing the count on the falling edge (logic symbol pin 1). |
| 2 | 1CLR | input | Direct clear input of counter 1, which resets its four outputs to low. |
| 3 | 1QA | output | Counter 1 output QA, the least-significant bit of the binary count. |
| 4 | 1QB | output | Counter 1 output QB of the 4-bit binary count. |
| 5 | 1QC | output | Counter 1 output QC of the 4-bit binary count. |
| 6 | 1QD | output | Counter 1 output QD, the most-significant bit of the binary count. |
| 7 | GND | power_in | Ground. |
| 8 | 2QD | output | Counter 2 output QD, the most-significant bit of the binary count. |
| 9 | 2QC | output | Counter 2 output QC of the 4-bit binary count. |
| 10 | 2QB | output | Counter 2 output QB of the 4-bit binary count. |
| 11 | 2QA | output | Counter 2 output QA, the least-significant bit of the binary count. |
| 12 | 2CLR | input | Direct clear input of counter 2, which resets its four outputs to low. |
| 13 | 2A | input | Clock input of counter 2, advancing the count on the falling edge. |
| 14 | VCC | power_in | Positive supply voltage. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `SN74LS393DR`
- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`
- 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files: `sn74ls393dr-etched.step` / `sn74ls393dr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74ls393dr.step` / `sn74ls393dr.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/lit/ds/symlink/sn74ls393.pdf) (37 pp, sha256 `01ffbca0db1f34ba`, retrieved 2026-10-05, 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/sn74ls393dr-datasheet.pdf)