PCA9546APWR

Specialized Overview

The PCA9546APWR is a bidirectional translating switch manufactured by Texas Instruments, designed for I2C and SMBus applications. It integrates four independent switches to expand I2C bus capacity or isolate devices. The device operates within a supply voltage range of 2.3 V to 5.5 V and supports data rates up to 400 kHz. Key electrical specifications include a maximum on-resistance of 45 Ohms and a maximum power dissipation of 400 mW. The component draws a maximum supply current of 12 uA and functions reliably across an operating temperature range from -40°C to +85°C.

Specialized Feature Summary

• Provides four independent bidirectional translating switches for I2C and SMBus protocols
• Enables expansion of I2C bus capacity by isolating downstream devices
• Supports voltage translation between different logic levels within the specified supply range

Specialized Applications

• I2C bus expansion in embedded systems
• Isolation of multiple I2C slave devices from a single master
• Voltage level translation between mixed-voltage I2C domains

Specialized Procurement Notes

Verify the specific ordering suffix to confirm package type and tape/reel configuration. Ensure compatibility with the target PCB footprint, specifically the 16-TSSOP package dimensions. Confirm RoHS compliance status if required by assembly standards. Cross-reference the manufacturer part number with distributor codes to avoid substitution errors during procurement.

Specialized Selection Notes

Select this component when designing circuits requiring isolation of up to four I2C peripherals from a single controller. Verify that the system supply voltage falls within the 2.3 V to 5.5 V operational range. Consider the 45 Ohm on-resistance impact on signal integrity at high frequencies. Ensure the thermal environment remains within the -40°C to +85°C industrial temperature limits for reliable operation.

Specialized Part Context

This part belongs to the PCA9546A series of bidirectional translating switches. It shares core functionality with variants such as the PCA9546APWT and PCA9546APWG4, differing primarily in packaging and manufacturing revisions. The APWR suffix specifically denotes the TSSOP-16 surface-mount package format commonly used in space-constrained designs.

Specialized Replacement Considerations

Direct functional substitutes include the PCA9546APWT and PCA9546APWG4. Verify pinout compatibility and package dimensions before substitution. Check datasheet revisions for any changes in electrical characteristics or recommended operating conditions.