TCA9554APWR

Overview

The TCA9554APWR is a remote 8-bit I2C and SMBus I/O expander manufactured by Texas Instruments. It operates within a supply voltage range of 1.65 V to 5.5 V, supporting low-voltage logic systems. The device features an interrupt output pin for efficient event handling and includes configuration registers to define input or output directions for each port. It supports clock frequencies up to 400 kHz and provides ESD protection rated at 2 kV. Packaged in a 16-pin TSSOP surface-mount format, it functions reliably across an industrial temperature range from -40°C to +85°C.

Feature Summary

• Supports I2C and SMBus serial communication protocols for system integration
• Includes dedicated interrupt output pin for asynchronous status signaling
• Features configurable direction control via internal configuration registers

Applications

• Remote I/O expansion in embedded controller systems
• Interface bridging between low-voltage microcontrollers and higher-voltage peripherals
• Industrial control panels requiring extended GPIO capabilities

Procurement Notes

Verify the specific package variant and suffix against official Texas Instruments documentation to ensure compatibility with design requirements. Confirm RoHS compliance status and manufacturing origin through authorized distributors. Check for any recent product change notices that may affect assembly or sourcing parameters before finalizing procurement decisions.

Selection Notes

Select this component when an 8-bit I/O expansion solution is required over an I2C bus with support for both 1.65 V and 5.5 V logic levels. Ensure the application benefits from the interrupt capability for efficient polling reduction. Verify that the TSSOP-16 footprint aligns with the PCB layout constraints and thermal management requirements of the target enclosure.

Part Context

This part belongs to the TCA9554A series of remote I/O expanders designed for general-purpose digital input and output applications. It serves as a direct functional replacement for legacy PCA9554 devices while offering improved low-voltage operation down to 1.65 V. The series is widely used in consumer electronics and industrial automation for expanding microcontroller ports without additional hardware complexity.

Replacement Considerations

The PCA9554APWRG4 is a related variant within the same family but operates with a minimum supply voltage of 2.3 V rather than 1.65 V. Designers must verify voltage level compatibility if substituting between these parts. Other package options such as TCA9554ADBR (SSOP) offer physical form factor alternatives with identical electrical characteristics.