PCA9546APW,112

Specialized Overview

The PCA9546APW,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 an operating supply voltage range of 2.3 V to 5.5 V and operates within an ambient temperature range of -40 °C to +85 °C. It features low on-state resistance, with maximum values of 30 Ω at 3.6 V and 24 Ω at 5.5 V. The component includes an active LOW reset input and three hardware address pins, allowing up to eight devices on a single bus. It supports clock frequencies from 0 Hz to 400 kHz.

Specialized Feature Summary

• Provides four independent bidirectional channels for I2C/SMBus signal routing
• Enables voltage level translation between different bus voltages using the VDD pin
• Includes an active LOW reset input to recover from stuck-low bus conditions
• Supports hot insertion without generating glitches on power-up

Specialized Applications

• Expanding I2C or SMBus slave device capacity in embedded systems
• Connecting multiple sensors or peripherals with different voltage requirements
• Isolating downstream buses to prevent stuck-low faults from affecting the main controller

Specialized Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and packing method. Confirm that the component meets all applicable RoHS directives and environmental standards required for the target assembly process. Ensure compatibility with the intended PCB footprint and soldering profile before finalizing procurement.

Specialized Selection Notes

Select this component when four independent I2C channels are required with voltage translation capabilities. Verify that the system voltage levels fall within the 2.3 V to 5.5 V operating range. Consider the TSSOP-16 package dimensions if board space is constrained. Ensure external pull-up resistors are sized appropriately for the total bus capacitance and desired clock speed.

Specialized Part Context

This part belongs to the PCA9546A family of I2C-bus switches manufactured by NXP Semiconductors. The family includes variants such as PCA9546AD and PCA9546ABS, which offer alternative packaging options like SO16 and HVQFN16 while maintaining identical electrical functionality. The APW suffix specifically denotes the TSSOP16 plastic thin shrink small outline package.

Specialized Replacement Considerations

Direct functional equivalents include the PCA9546AD and PCA9546ABS from NXP. Texas Instruments offers the PCA9546A series, though on-resistance and package types may differ. Verify pinout compatibility and electrical specifications before substituting.