# SN74AHCT594DBR

**Texas Instruments** · Shift Registers · SSOP-16-208mil

SN74AHCT594DBR from Texas Instruments, in a SSOP-16-208mil. 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 | QB | output | Parallel output B of the 8-bit storage register. |
| 2 | QC | output | Parallel output C of the 8-bit storage register. |
| 3 | QD | output | Parallel output D of the 8-bit storage register. |
| 4 | QE | output | Parallel output E of the 8-bit storage register. |
| 5 | QF | output | Parallel output F of the 8-bit storage register. |
| 6 | QG | output | Parallel output G of the 8-bit storage register. |
| 7 | QH | output | Parallel output H of the 8-bit storage register. |
| 8 | GND | power_in | Ground pin. |
| 9 | QH' | output | Serial output (QH inverted) of the shift register, provided for cascading multiple devices. |
| 10 | SRCLR | input | Active-low serial (shift register) clear; when low, the shift register is cleared. |
| 11 | SRCLK | input | Shift register clock; shift register is positive-edge triggered. |
| 12 | RCLK | input | Storage register clock; storage register is positive-edge triggered. |
| 13 | RCLR | input | Active-low storage register clear; when low, the storage register is cleared. |
| 14 | SER | input | Serial data input to the 8-bit shift register. |
| 15 | QA | output | Parallel output A of the 8-bit storage register. |
| 16 | VCC | power_in | Supply pin; VCC recommended operating range is 4.5 V to 5.5 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SSOP-16-208mil |
| Category | Logic |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `SN74AHCT594DBR`
- Footprint: `Package_SO:SSOP-16_5.3x6.2mm_P0.65mm`
- 3D model: SSOP-16-208mil (KiCad packages3D, STEP)
- 3D model files: `sn74ahct594dbr-etched.step` / `sn74ahct594dbr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sn74ahct594dbr.step` / `sn74ahct594dbr.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/sn74ahct594) (31 pp, sha256 `3153f7a4588c9ac9`, retrieved 2026-10-08, 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-5-5` (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/sn74ahct594dbr-datasheet.pdf)