PCA9546ADT

Specialized Overview

The PCA9546ADT is a quad bidirectional translating switch controlled via the I2C-bus, manufactured by Texas Instruments. It fans out an upstream SCL/SDA pair to four downstream SCx/SDx channels, allowing individual or combined channel selection through a programmable control register. The device operates within a supply voltage range of 2.3 V to 5.5 V and supports bandwidths up to 400 kHz. It features a maximum on-resistance of 45 Ohms and a maximum power dissipation of 400 mW. The component functions across an operating temperature range from -40°C to +85°C and is housed in a 16-pin SOIC-Narrow package.

Specialized Feature Summary

• Provides four independent bidirectional translating switches for I2C and SMBus applications
• Allows flexible configuration of downstream channels via programmable control register
• Includes an active LOW reset pin for reliable system initialization

Specialized Applications

• I2C bus expansion in embedded systems
• SMBus multiplexing for sensor networks
• Bidirectional voltage level translation between different logic domains

Specialized Procurement Notes

Verify the specific suffix 'T' against official Texas Instruments documentation to confirm tape-and-reel packaging and exact electrical tolerances. Cross-reference the manufacturer part number with current datasheets to ensure availability status and compliance with RoHS standards before procurement planning.

Specialized Selection Notes

Select this component when designing systems requiring multiple isolated I2C buses from a single master controller. Ensure the target application voltage falls within the 2.3 V to 5.5 V range. Verify that the required channel count does not exceed four and that the 45 Ohm on-resistance meets the signal integrity requirements of the connected peripherals.

Specialized Part Context

The PCA9546ADT belongs to the PCA9546A series of I2C bus switches. This family is designed to expand I2C bus capacity and isolate devices with conflicting addresses. The 'AD' prefix typically denotes the SOIC-16 package variant, while the 'T' suffix indicates reel packaging for automated assembly processes.

Specialized Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Consult the official Texas Instruments product selection guide for compatible alternatives such as the TCA9546A series or other quad-channel I2C switches.