PCA9546AD,112

Specialized Overview

The PCA9546AD,112 is a quad bidirectional translating switch controlled via the I2C-bus. It fans out one upstream SCL/SDA pair to four downstream pairs (channels). The device supports voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses. Operating power supply voltage ranges from 2.3 V to 5.5 V. Maximum on-state resistance is 24 ohms at VDD = 3.6 V. Clock frequency supports 0 Hz to 400 kHz. Operating temperature range is -40 °C to +85 °C. The package is SO16 (SOT109-1) with 16 leads.

Specialized Feature Summary

• Four independent bidirectional translating switches for I2C/SMBus communication
• Active LOW reset input to recover from stuck bus conditions
• Hardware selectable address pins allowing up to eight devices on the bus
• Supports hot insertion and low standby current operation

Specialized Applications

• I2C bus multiplexing in embedded systems
• Voltage level translation between different bus domains
• System expansion using multiple I2C peripherals

Specialized Procurement Notes

Verify the ordering suffix ,112 corresponds to the SO16 tube packaging configuration. Confirm the manufacturer is NXP Semiconductors. Check RoHS compliance status as specified in the product data sheet. Ensure the component meets the required ambient operating temperature range of -40 °C to +85 °C for your specific application environment.

Specialized Selection Notes

Select this part when four separate I2C channels are needed from a single master. Use the SO16 package if board space allows for standard small outline dimensions. Consider the PCA9546ABS variant if a smaller HVQFN16 footprint is required. Ensure external pull-up resistors are sized correctly for the target bus capacitance and voltage levels.

Specialized Part Context

This component belongs to the PCA9546A family of I2C-bus switches. Other variants include PCA9546ABS in HVQFN16 and PCA9546APW in TSSOP16. All share identical electrical characteristics but differ in physical package dimensions and thermal properties. The AD suffix specifically denotes the plastic small outline package version.

Specialized Replacement Considerations

PCA9546ABS,118 offers the same functionality in an HVQFN16 package. PCA9546APW provides equivalent performance in a TSSOP16 package. Texas Instruments produces functionally similar parts like the PCA9546AD, though pinouts and specifications should be verified against official datasheets before substitution.