TCA9534PWR from Texas Instruments, in a TSSOP-16. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	A0	input	Hardware I2C slave address input bit 0. Connect directly to VCC or GND to set the device address. Used together with A1 and A2 to allow up to eight TCA9534 devices on the same I2C bus.
2	A1	input	Hardware I2C slave address input bit 1. Connect directly to VCC or GND. Combined with A0 and A2 sets the 7-bit I2C address.
3	A2	input	Hardware I2C slave address input bit 2. Connect directly to VCC or GND. Combined with A0 and A1 sets the 7-bit I2C address.
4	P0	bidirectional	P-port bit 0. Push-pull general-purpose I/O; configured as an input at power-on. 5-V tolerant. IOH up to -10 mA and IOL up to 25 mA per pin (subject to total device current limits).
5	P1	bidirectional	P-port bit 1. Push-pull general-purpose I/O; configured as an input at power-on. 5-V tolerant.
6	P2	bidirectional	P-port bit 2. Push-pull general-purpose I/O; configured as an input at power-on. 5-V tolerant.
7	P3	bidirectional	P-port bit 3. Push-pull general-purpose I/O; configured as an input at power-on. 5-V tolerant.
8	GND	power_in	Ground reference (0 V) for the device.
9	P4	bidirectional	P-port bit 4. Push-pull general-purpose I/O; configured as an input at power-on. 5-V tolerant.
10	P5	bidirectional	P-port bit 5. Push-pull general-purpose I/O; configured as an input at power-on. 5-V tolerant.
11	P6	bidirectional	P-port bit 6. Push-pull general-purpose I/O; configured as an input at power-on. 5-V tolerant.
12	P7	bidirectional	P-port bit 7. Push-pull general-purpose I/O; configured as an input at power-on. 5-V tolerant.
13	INT	output	Open-drain, active-low interrupt output. Asserts when an input port pin changes state; connect to VCC through a pull-up resistor. IOL must be externally limited to 7 mA maximum.
14	SCL	input	I2C serial clock bus input. Open-drain; connect to VCC through a pull-up resistor. Supports 100-kHz Standard-mode and 400-kHz Fast-mode. 5-V tolerant.
15	SDA	bidirectional	I2C serial data bus. Open-drain bidirectional; connect to VCC through a pull-up resistor. 5-V tolerant; SDA current must be externally limited to 12 mA max.
16	VCC	power_in	Supply voltage input. Operating range 1.65 V to 5.5 V. Bypass to GND with a local decoupling capacitor.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	TSSOP-16
Category	Interface
Pins	16

Ordering variants

Same part, different packaging or reel option.

TCA9534PWR
TCA9534PWRDW
TCA9534PWRDWR

CAD (KiCad official)

Symbol: TCA9534PWR
Footprint: Package_SO:TSSOP-16_4.4x5mm_P0.65mm
3D model: TSSOP-16 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`tca9534pwr.step`	205 KB	You want the bare part, or you mark your own boards.
`tca9534pwr-etched.step`	2.5 MB	You want the part with `TCA9534PWR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 616 faces against 255 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Texas Instruments datasheet (42 pp, sha256 797c1fc96502df7c, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF