TCA9545APWR

Overview

The TCA9545APWR is a bus switch IC manufactured by Texas Instruments, designed for I2C and SMBus applications. It features a 20-TSSOP surface-mount package and operates within a supply voltage range of 1.65V to 5.5V. The device supports an operating temperature range from -40°C to +85°C. It integrates two independent circuits, each configured as a 1-to-4 multiplexer, allowing for the expansion of I2C or SMBus busses.

Feature Summary

• Provides bidirectional translating capabilities between different voltage domains
• Enables multiple master and slave devices on a single I2C or SMBus bus
• Features low on-resistance for efficient signal transmission

Applications

• I2C bus expansion in embedded systems
• SMBus interface management
• Multi-master communication environments

Procurement Notes

Verify the specific suffix 'PWR' corresponds to the 20-TSSOP package and tape-and-reel orientation. Confirm RoHS compliance status and moisture sensitivity level (MSL) requirements for your assembly process. Ensure the ordering part number matches the exact manufacturer designation to avoid pinout discrepancies.

Selection Notes

Select this component when expanding I2C/SMBus connectivity with voltage translation needs. Compare against PCA9545 variants for package differences. Verify that the 1.65V minimum supply meets your system's lowest logic voltage. Check if the 2-channel architecture suffices for your bus topology before considering higher-channel alternatives.

Part Context

This part belongs to the TCA9545A series of bus switches. It serves as a bridge for connecting multiple I2C devices while managing address conflicts. The TSSOP-20 package offers a compact footprint suitable for space-constrained designs requiring robust bus isolation and translation.

Replacement Considerations

PCA9545ADWR is a documented substitute offering similar functionality in a SOIC-20 package.