TCA9554DWT

Overview

The TCA9554DWT is an 8-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 open-drain outputs with configurable interrupt capabilities and includes configuration registers for pin direction settings. It functions reliably across an operating temperature range of -40°C to +85°C. Packaged in a 16-pin SOIC (D) surface-mount format, it draws approximately 34 µA during operation.

Feature Summary

• Supports bidirectional data transfer via standard I2C and SMBus protocols
• Provides remote interrupt output triggered by input state changes or configuration mismatches
• Includes dedicated configuration registers to define individual pin directions as inputs or outputs

Applications

• Portable systems requiring low-voltage GPIO expansion
• Industrial control panels utilizing SMBus interfaces
• Consumer electronics with limited microcontroller pins

Procurement Notes

Verify the specific suffix 'DWT' corresponds to the tape-and-reel packaging variant when sourcing. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the selected distributor provides traceable component history to maintain quality standards in production environments.

Selection Notes

Select this component when an 8-bit expansion is required with open-drain output capability. The wide voltage range accommodates both 1.8V and 5V logic systems. Consider the SOIC-16 package dimensions for PCB layout constraints. Verify that the 400 kHz speed meets system timing requirements.

Part Context

This part belongs to the TCA9554 family of I/O expanders, which are successors to the PCA9554 series. The TCA9554 variants typically offer improved electrical characteristics and lower power consumption compared to earlier generations. The 'D' indicates the SOIC package, while 'WT' specifies the reel packaging format.

Replacement Considerations

TCA9554DWR is a direct functional equivalent with identical specifications but may differ in packaging quantity or reel type. Verify pin compatibility and software register mapping before substitution.