Texas Instruments PCA9535DWR

Mfr. Part

PCA9535DWR

Manufacturer

Luminary Micro/Texas Instruments

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Detailed Description

16-bit I2C/SMBus I/O expander for adding GPIO to a host MCU or MPU. Operates at 400 kHz bus speed over a 2.3–5.5 V supply. Push-pull outputs, interrupt output, and power-on reset for stable startup. Wide 24-SOIC (7.50 mm body) surface-mount package. Industrial temperature range -40°C to 85°C. Base family PCA9535. Stock on hand: 8,380 units (subject to change).

Key Features

16 GPIO lines organized as two 8-bit ports

I2C/SMBus compatible up to 400 kHz (Fast-mode)

Supply voltage range 2.3 V to 5.5 V (ideal for 3.3 V and 5 V systems)

Push-pull outputs for direct LED and logic driving

Interrupt output to signal input changes and reduce polling

Power-on reset places registers in a known state; ports default to inputs for safe startup

Address pins A0–A2 allow up to 8 devices on the same I2C bus

Surface-mount 24-SOIC wide package for easy reflow

ROHS3 compliant

Key Advantages

Quickly expands MCU GPIO by 16 lines without redesigning the processor or PCB

Handles both 3.3 V and 5 V logic systems with one part

Push-pull outputs source up to 10 mA and sink up to 25 mA to drive LEDs and logic reliably

Interrupt pin simplifies firmware, lowers bus traffic, and cuts power by avoiding constant reads

Fast 400 kHz bus reduces latency for control and monitoring

Standard wide SOIC package improves manufacturability and assembly yield

Robust POR improves system stability and startup behavior

Scalable addressing supports multiple expanders on one bus

Packaging

Type: Tape & Reel (TR) for automated pick-and-place

Package / Case: 24-SOIC (wide), 0.295 inch (7.50 mm) body width, gull‑wing leads

Material: Molded epoxy package, copper alloy leadframe, matte tin-plated leads

Pin configuration: 24 pins including 16 GPIO (Port 0 and Port 1), SDA, SCL, INT, VCC, GND, and A0–A2 address pins (see datasheet for exact pin mapping)

Thermal characteristics: Wide SOIC gives good heat spreading; follow derating at high ambient temperatures and check RθJA/RθJC in the datasheet for precise values

Electrical properties: 2.3–5.5 V supply, 400 kHz I2C/SMBus, push-pull outputs, typical 10 mA source / 25 mA sink per pin, POR on power-up

Lifecycle

Status: Active and broadly available; not near discontinuation based on TI’s current portfolio

Alternatives and equivalents (verify pinout, registers, and electrical limits before substitution)

- Texas Instruments TCA9535 (similar 16-bit I2C expander, wider voltage support)

- Texas Instruments PCA9555 or TCA9555 (16-bit I2C expander with closely related feature set)

- NXP PCA9555 and PCA9535 variants (functionally similar; check output type and register differences)

- Microchip MCP23017 (16-bit I2C expander; different register map and timing)

- onsemi CAT9535 (similar function; confirm specifics)

If you need formal cross-references or a drop-in alternative, contact our sales team via the Y-IC website for detailed matching support

Key Application Areas

Consumer electronics: buttons, LEDs, and status indicators in TVs, set-top boxes, appliances

Computing and servers: backplane and chassis management, fan and power status, LED control

Industrial control and PLCs: input banks, relay/driver interfacing, sensor matrix scanning

Automotive (non-safety-critical): infotainment and interior electronics within -40°C to 85°C

IoT and embedded: GPIO expansion for MCUs/SoCs, keyboard matrices, board management controllers

Communications equipment: transceiver presence/control, panel IO, alarm indicators

Test and measurement: programmable IO banks, instrument front-panel control

Datasheet

Y-IC hosts the most authoritative datasheet for PCA9535DWR on this product page. Download it here to get the full pinout, timing, electrical limits, and layout guidelines.

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