PCA9546APWTG4

Specialized Overview

The PCA9546APWTG4 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. Designed for surface-mount applications, it is housed in a 16-TSSOP package with dimensions of 0.173 inches (4.40 mm) width. The component functions across a temperature range from -40°C to +85°C.

Specialized Feature Summary

• Provides four independent bidirectional translating switches for I2C and SMBus signals
• Allows flexible configuration of any single or combination of downstream channels
• Includes an active LOW reset pin for reliable system initialization

Specialized Applications

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

Specialized Procurement Notes

Verify the specific suffix 'G4' against official Texas Instruments documentation to confirm RoHS compliance status and manufacturing origin. Ensure the TSSOP-16 package variant matches the design footprint requirements. Cross-reference the datasheet revision date to validate electrical characteristics and pinout definitions before finalizing procurement specifications.

Specialized Selection Notes

Select this component when designing systems requiring multiple isolated I2C branches from a single master controller. Verify that the required operating voltage falls within the 2.3 V to 5.5 V range. Confirm that the 45 ohm on-resistance meets the signal integrity requirements for the target bus speed. Ensure the PCB layout accommodates the 16-TSSOP package dimensions and thermal dissipation needs.

Specialized Part Context

This part belongs to the PCA9546A series of I2C switches. It serves as a bridge between upstream I2C masters and multiple downstream slave devices. The device simplifies system architecture by eliminating the need for external logic gates to manage bus arbitration and signal routing across multiple channels.

Specialized Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Consult the manufacturer's official replacement guide or contact technical support for verified alternatives.