Overview Files Discover Packages Releases Dependencies Issues Breadcrumbs Pull Requests Activity

3D Model

Open in new tab ↗

Loads on click. Unloads only if this page sits in the background.

Symbol & Footprint

Schematic Symbol

Open full view ↗

Loads on click. Unloads only if this page sits in the background.

PCB Footprint

Open full view ↗

Loads on click. Unloads only if this page sits in the background.

Datasheet

Open in new tab ↗

Loads on click. Unloads only if this page sits in the background.

Download PDF

Contents

Pinout
Key specifications
CAD (KiCad official)
Provenance

README

markdown

TCA9535RTWR

Texas Instruments · I/O Expanders · WQFN-24-EP(4x4)

TCA9535RTWR from Texas Instruments, in a WQFN-24-EP(4x4). 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	P00	bidirectional	I/O port 0, bit 0; configurable as input or output via I2C; push-pull output with 5V tolerance; maximum 25 mA per pin; defaults to input at power-on.
2	P01	bidirectional	I/O port 0, bit 1; configurable as input or output via I2C; push-pull output with 5V tolerance; maximum 25 mA per pin; defaults to input at power-on.
3	P02	bidirectional	I/O port 0, bit 2; configurable as input or output via I2C; push-pull output with 5V tolerance; maximum 25 mA per pin; defaults to input at power-on.
4	P03	bidirectional	I/O port 0, bit 3; configurable as input or output via I2C; push-pull output with 5V tolerance; maximum 25 mA per pin; defaults to input at power-on.
5	P04	bidirectional	I/O port 0, bit 4; configurable as input or output via I2C; push-pull output with 5V tolerance; maximum 25 mA per pin; defaults to input at power-on.
6	P05	bidirectional	I/O port 0, bit 5; configurable as input or output via I2C; push-pull output with 5V tolerance; maximum 25 mA per pin; defaults to input at power-on.
7	P06	bidirectional	I/O port 0, bit 6; configurable as input or output via I2C; push-pull output with 5V tolerance; maximum 25 mA per pin; defaults to input at power-on.
8	P07	bidirectional	I/O port 0, bit 7; configurable as input or output via I2C; push-pull output with 5V tolerance; maximum 25 mA per pin; defaults to input at power-on.
9	GND	power_in	Ground reference.
10	P10	bidirectional	I/O port 1, bit 0; configurable as input or output via I2C; push-pull output with 5V tolerance; maximum 25 mA per pin; defaults to input at power-on.
11	P11	bidirectional	I/O port 1, bit 1; configurable as input or output via I2C; push-pull output with 5V tolerance; maximum 25 mA per pin; defaults to input at power-on.
12	P12	bidirectional	I/O port 1, bit 2; configurable as input or output via I2C; push-pull output with 5V tolerance; maximum 25 mA per pin; defaults to input at power-on.
13	P13	bidirectional	I/O port 1, bit 3; configurable as input or output via I2C; push-pull output with 5V tolerance; maximum 25 mA per pin; defaults to input at power-on.
14	P14	bidirectional	I/O port 1, bit 4; configurable as input or output via I2C; push-pull output with 5V tolerance; maximum 25 mA per pin; defaults to input at power-on.
15	P15	bidirectional	I/O port 1, bit 5; configurable as input or output via I2C; push-pull output with 5V tolerance; maximum 25 mA per pin; defaults to input at power-on.
16	P16	bidirectional	I/O port 1, bit 6; configurable as input or output via I2C; push-pull output with 5V tolerance; maximum 25 mA per pin; defaults to input at power-on.
17	P17	bidirectional	I/O port 1, bit 7; configurable as input or output via I2C; push-pull output with 5V tolerance; maximum 25 mA per pin; defaults to input at power-on.
18	A0	input	Address input 0; connect directly to VCC or GND to program I2C device address; must not be left floating; used with A1 and A2 to select one of eight addresses.
19	SCL	input	I2C/SMBus serial clock input; connect to VCC through pull-up resistor; supports up to 400 kHz fast-mode operation.
20	SDA	input	I2C/SMBus serial data input; connect to VCC through pull-up resistor; open-drain design allows device to drive and release bus; supports up to 400 kHz fast-mode.
21	VCC	power_in	Supply voltage input; supports 1.65 V to 5.5 V operating range.
22	INT	tri_state	Open-drain interrupt output, active-low when any input state differs from Input Port register; requires external pull-up resistor to VCC (typically 10 kΩ).
23	A1	input	Address input 1; connect directly to VCC or GND to program I2C device address; must not be left floating; used with A0 and A2 to select one of eight addresses.
24	A2	input	Address input 2; connect directly to VCC or GND to program I2C device address; must not be left floating; used with A0 and A1 to select one of eight addresses.
25	EP	passive	Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	WQFN-24-EP(4x4)
Category	Interface
Pins	25

CAD (KiCad official)

Symbol: TCA9535RTWR
Footprint: Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.7x2.7mm
3D model: WQFN-24-EP(4x4) (KiCad packages3D, STEP)
3D model files: tca9535rtwr-etched.step / tca9535rtwr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); tca9535rtwr.step / tca9535rtwr.glb are the bare package body.

Provenance

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

Datasheet: Texas Instruments datasheet (48 pp, sha256 ccd86bad1cdf933f, retrieved 2026-09-18, 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 0.2, primary claude-haiku-4-5-20251001 (text), consensus claude-sonnet-4-6 (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