# SN74LS163ADR

**Texas Instruments** · Counters, Dividers · SOIC-16

SN74LS163ADR from Texas Instruments, in a SOIC-16. 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 | CLR | input | Active-low clear input; on the 'LS163A the clear is synchronous and sets all four flip-flop outputs low after the next clock pulse regardless of the enable inputs. |
| 2 | CLK | input | Clock input; the buffered clock triggers the four flip-flops on the rising edge of the clock waveform. |
| 3 | A | input | Data input A, loaded synchronously into the QA flip-flop when LOAD is low. |
| 4 | B | input | Data input B, loaded synchronously into the QB flip-flop when LOAD is low. |
| 5 | C | input | Data input C, loaded synchronously into the QC flip-flop when LOAD is low. |
| 6 | D | input | Data input D, loaded synchronously into the QD flip-flop when LOAD is low. |
| 7 | ENP | input | Count-enable input P; with ENT it enables counting when both are high. |
| 8 | GND | power_in | Ground. |
| 9 | LOAD | input | Active-low synchronous load input; a low level disables the counter and loads the data inputs on the next clock pulse regardless of the enable inputs. |
| 10 | ENT | input | Count-enable input T; it also gates the ripple carry output RCO. |
| 11 | QD | output | Counter output D (most significant bit). |
| 12 | QC | output | Counter output C. |
| 13 | QB | output | Counter output B. |
| 14 | QA | output | Counter output A (least significant bit). |
| 15 | RCO | output | Ripple carry output for n-bit cascading; counting spikes may occur on this output. |
| 16 | VCC | power_in | Supply voltage. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16 |
| Category | Logic |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `SN74LS163ADR`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files: `sn74ls163adr-etched.step` / `sn74ls163adr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74ls163adr.step` / `sn74ls163adr.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/sn74ls163a.pdf) (40 pp, sha256 `0ea50a72dfbd95c3`, 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/sn74ls163adr-datasheet.pdf)