# TCA9543ADR

**Texas Instruments** · Signal Switches, Multiplexers, Decoders · SOIC-14

TCA9543ADR 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 | A0 | input | Address input 0; connect to VCC or ground to set device slave address. |
| 2 | A1 | input | Address input 1; connect to VCC or ground to set device slave address. |
| 3 | RESET | input | Active-low reset input; resets I2C state machine and deselects both channels when low. |
| 4 | INT0 | input | Active-low interrupt input 0 from channel 0 slaves; pull-up resistor to VDPU0. |
| 5 | SD0 | bidirectional | Serial data 0 for channel 0 I2C bus; pull-up resistor to VDPU0. |
| 6 | SC0 | bidirectional | Serial clock 0 for channel 0 I2C bus; pull-up resistor to VDPU0. |
| 7 | GND | power_in | Ground |
| 8 | INT1 | input | Active-low interrupt input 1 from channel 1 slaves; pull-up resistor to VDPU1. |
| 9 | SD1 | bidirectional | Serial data 1 for channel 1 I2C bus; pull-up resistor to VDPU1. |
| 10 | SC1 | bidirectional | Serial clock 1 for channel 1 I2C bus; pull-up resistor to VDPU1. |
| 11 | INT | output | Active-low interrupt output combining INT0 and INT1; pull-up resistor to VDPUM. |
| 12 | SCL | bidirectional | Serial clock line for upstream I2C master; pull-up resistor to VDPUM. |
| 13 | SDA | bidirectional | Serial data line for upstream I2C master; pull-up resistor to VDPUM. |
| 14 | VCC | power_in | Supply power voltage with operating range 1.65 V to 5.5 V. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `TCA9543ADR`
- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`
- 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files: `tca9543adr-etched.step` / `tca9543adr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tca9543adr.step` / `tca9543adr.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/tca9543a.pdf) (34 pp, sha256 `dfa2c184725031a8`, retrieved 2026-10-03, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (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/tca9543adr-datasheet.pdf)