PCA9545AGQNR

Specialized Overview

The PCA9545AGQNR is a quad bidirectional translating switch manufactured by Texas Instruments, designed for I2C and SMBus systems. It fans out one upstream SCL/SDA pair to four downstream SCn/SDn channel pairs. The device allows any individual channel or combination of channels to be selected via a programmable control register. It operates within a supply voltage range of 2.3 V to 5.5 V and supports mixed-mode signal operation. The component features interrupt logic and reset functions, accommodating standard mode and fast mode I2C devices while supporting arbitration and clock stretching.

Specialized Feature Summary

• Quad bidirectional translating switches controlled via the I2C bus
• Programmable control register for flexible channel selection
• Integrated interrupt logic and reset functions
• Supports mixed-mode signal operation across different voltage domains

Specialized Applications

• I2C bus extension in embedded systems
• SMBus system architecture design
• Mixed-voltage interface bridging
• Multi-master I2C bus configurations

Specialized Procurement Notes

Verify the specific suffix 'GQNR' against official Texas Instruments documentation to confirm package type and tape-and-reel specifications. Ensure compatibility with required operating temperature ranges and voltage levels before procurement. Cross-reference part numbers with authorized distributors to avoid counterfeit components.

Specialized Selection Notes

Select this component when multiple I2C/SMBus devices with conflicting addresses need to coexist on a single bus segment. It is suitable for designs requiring voltage translation between different logic levels. Consider the 20-VQFN package constraints for PCB layout and thermal management during the selection process.

Specialized Part Context

This part belongs to the PCA9545A family of I2C and SMBus switches. It shares functional similarities with the PCA9544A but offers distinct channel selection capabilities. The device is widely used in consumer electronics and industrial automation where bus isolation and address conflict resolution are critical requirements.

Specialized Replacement Considerations

The PCA9545ARGYR is a verified substitute offering identical functionality in a 20-VQFN package. Other variants within the PCA9545A series may provide alternative packaging options such as TSSOP-20 or SOIC-20 while maintaining electrical compatibility.