TCA9535RTWR

Overview

The TCA9535RTWR is a low-voltage 16-bit I/O expander from Texas Instruments, designed for I2C and SMBus communication. It operates within a supply voltage range of 1.65 V to 5.5 V and supports clock frequencies up to 400 kHz. The device features 16 general-purpose digital input/output pins, an interrupt output capability, and configuration registers for pin direction control. It is housed in a WQFN-24 package suitable for surface-mount installation. The component functions across a temperature range of -40°C to +85°C and includes 2 kV ESD protection.

Feature Summary

• Provides 16 additional digital I/O channels via standard serial interfaces
• Supports remote interrupt signaling for efficient host monitoring
• Includes configuration registers for flexible pin direction assignment

Applications

• Portable consumer electronics requiring extended I/O capabilities
• Industrial control systems utilizing I2C or SMBus networks
• Embedded devices needing low-power peripheral expansion

Procurement Notes

Verify the specific suffix RTWR indicates the WQFN-24 package and reel packaging format. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the design accounts for the specified humidity sensitivity level during storage and assembly processes to maintain device reliability.

Selection Notes

Select this component when a wide supply voltage range starting at 1.65 V is required compared to the PCA9535 series which starts at 2.3 V. The WQFN-24 package offers a compact footprint for space-constrained designs. Verify that the system requires the specific interrupt and configuration register features provided by this logic family.

Part Context

This part belongs to the TCA9535 series of low-voltage I/O expanders. It serves as a variant of the broader PCA9535 family but with distinct electrical characteristics, specifically a lower minimum operating voltage. The RTWR suffix denotes the specific tape-and-reel packaging and WQFN-24 form factor used for automated surface-mount assembly.

Replacement Considerations

The PCA9535RTWR is a related device within the same product family but operates with a higher minimum supply voltage of 2.3 V. Designers must verify if their system power rails support the TCA9535's 1.65 V minimum requirement before substituting.