PCA9544APWE4

Specialized Overview

The PCA9544APWE4 is a quad bidirectional translating switch manufactured by Texas Instruments, designed for I2C and SMBus systems. It provides four independent channels to fan out an upstream SCL/SDA pair to downstream SCn/SDn pairs. The device allows selection of one channel at a time via a programmable control register. Key electrical parameters include a supply voltage range of 1.65 V to 5.5 V, maximum on-resistance of 16 Ohms, and maximum power dissipation of 400 mW. It operates within a temperature range of -40°C to +85°C and features active-low interrupt inputs and output.

Specialized Feature Summary

• Provides four independent bidirectional translating switches for I2C and SMBus bus extension
• Supports mixed-mode signal operation with voltage level translation between upstream and downstream buses
• Includes four active-low interrupt inputs and one active-low interrupt output for event monitoring

Specialized Applications

• Extending I2C or SMBus bus distance in embedded systems
• Creating multiple I2C branches from a single master controller
• Voltage level translation between different logic families in mixed-voltage designs

Specialized Procurement Notes

Verify the specific suffix 'E4' indicates lead-free compliance and RoHS status against the manufacturer's current documentation. Confirm the package type matches the required PCB footprint, as variants exist in TSSOP-20 and other formats. Ensure the operating voltage requirements align with the 1.65 V to 5.5 V specification before integration into the target circuit design.

Specialized Selection Notes

Select this component when a single-channel-per-cycle switching architecture is sufficient for the application. Compare against the PCA9545A if simultaneous multi-channel activation is required, as the PCA9544A restricts selection to one channel at a time. Verify that the 16 Ohm on-resistance meets the signal integrity requirements for the specific bus capacitance and speed.

Specialized Part Context

This part belongs to the PCA9544A family of bidirectional translating switches. It shares functional similarities with the PCA9545A but differs in switching capability, allowing only one channel to be active simultaneously. The 'E4' suffix typically denotes environmental compliance, such as being lead-free and RoHS compliant, distinguishing it from older non-compliant versions.

Specialized Replacement Considerations

The PCA9544APWR is a direct pin-compatible alternative with potentially different packaging or compliance suffixes. The PCA9545A offers similar functionality but supports simultaneous multi-channel switching, which may require software adaptation.