PCA9546AD,118

Specialized Overview

The PCA9546AD,118 is a quad bidirectional translating switch controlled via the I2C-bus. It fans out one upstream SCL/SDA pair to four downstream pairs or channels. The device supports voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses. Operating supply voltage ranges from 2.3 V to 5.5 V with a maximum on-resistance of 24 Ohms. Propagation delay is 0.3 ns, and clock frequency reaches 400 kHz. It operates within an ambient temperature range of -40 °C to +85 °C in a 16-lead SOIC package.

Specialized Feature Summary

• Provides four independent bidirectional translating switches for I2C/SMBus applications
• Features an active LOW reset input to recover from stuck bus conditions
• Supports hot insertion and low standby current operation
• Includes internal power-on reset to ensure all channels are deselected upon startup

Specialized Applications

• I2C bus multiplexing and expansion
• Voltage level translation between different bus domains
• System isolation for multiple I2C peripherals

Specialized Procurement Notes

Verify the specific ordering suffix ',118' corresponds to the reel packaging format required for the production line. Confirm that the SO16 package variant matches the PCB footprint design. Ensure the component meets RoHS compliance standards applicable to the target assembly process.

Specialized Selection Notes

Select this component when four separate I2C channels requiring voltage translation are needed. The SO16 package is suitable for standard surface mount assembly. Consider the 24 Ohm on-resistance and 400 kHz bandwidth against system timing requirements.

Specialized Part Context

This part belongs to the PCA9546A family of I2C-bus switches. Other variants include the ABS (HVQFN16) and APW (TSSOP16) packages. All share the same core functionality but differ in physical dimensions and thermal characteristics.

Specialized Replacement Considerations

PCA9546ADGVR by Texas Instruments is a direct replacement option.