TCA9535DBR

Overview

The TCA9535DBR is a remote 16-bit I2C low-power I/O expander manufactured by Texas Instruments. It operates within a supply voltage range of 1.65 V to 5.5 V and supports maximum clock frequencies up to 400 kHz. The device features push-pull outputs, interrupt output capability, and configuration registers for flexible pin assignment. It is housed in an SSOP-24 package with surface mount installation. The component provides ESD protection rated at 2 kV and functions reliably across a temperature range from -40°C to +85°C.

Feature Summary

• Supports bidirectional data transfer via I2C and SMBus protocols
• Includes dedicated interrupt output pin for efficient event handling
• Features configuration registers allowing individual input/output pin direction control

Applications

• Portable devices requiring extended I/O capabilities
• Industrial control systems utilizing I2C communication
• Consumer electronics with limited microcontroller pins

Procurement Notes

Verify the specific ordering suffix against official manufacturer documentation to ensure correct packaging and tape-and-reel specifications. Confirm RoHS compliance status through current datasheets as regulatory requirements may evolve. Cross-reference the full part number with authorized distributor catalogs to validate availability and authenticity before procurement.

Selection Notes

Select this component when a 16-bit expansion is required for I2C-based designs. Ensure the system voltage aligns with the 1.65 V to 5.5 V operating range. Verify that the SSOP-24 package dimensions fit the PCB layout constraints. Consider the interrupt functionality if real-time response to input changes is necessary for the application logic.

Part Context

This part belongs to the TCA9535 series of I/O expanders. It serves as a successor or variant to the PCA9535 family, offering similar functionality with potential improvements in power consumption or feature set. It addresses the need for additional digital inputs and outputs in space-constrained embedded systems without increasing the microcontroller pin count.

Replacement Considerations

The PCA9535 is a related component within the same functional category. Verify electrical compatibility and pinout correspondence before substitution. Check for differences in operating voltage ranges and package types to ensure mechanical and electrical interchangeability.