# SN74LS93D

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

SN74LS93D 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 | CKB | input | Clock input B for the divide-by-eight section (QB, QC, QD); connect to QA to use the full 4-bit binary count. |
| 2 | R0(1) | input | Gated zero-reset input 1; the counter is reset to zero when both R0(1) and R0(2) are high. |
| 3 | R0(2) | input | Gated zero-reset input 2; the counter is reset to zero when both R0(1) and R0(2) are high. |
| 4 | NC | unconnected | No internal connection. |
| 5 | VCC | power_in | Positive supply voltage. |
| 6 | NC | unconnected | No internal connection. |
| 7 | NC | unconnected | No internal connection. |
| 8 | QC | output | Counter output C, the third bit of the binary count. |
| 9 | QB | output | Counter output B, the second bit of the binary count. |
| 10 | GND | power_in | Ground. |
| 11 | QD | output | Counter output D, the most significant bit of the binary count. |
| 12 | QA | output | Counter output A, the divide-by-two output and least significant bit. |
| 13 | NC | unconnected | No internal connection. |
| 14 | CKA | input | Clock input A for the divide-by-two section (QA); count pulses are applied here. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `SN74LS93D`
- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`
- 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files: `sn74ls93d-etched.step` / `sn74ls93d-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74ls93d.step` / `sn74ls93d.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/sn54ls93) (27 pp, sha256 `43d2e13b0f0e6ce2`, retrieved 2026-10-10, tier: lcsc)
- **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/sn74ls93d-datasheet.pdf)