PCA9541PW/01,118

Specialized Overview

The PCA9541PW/01,118 is a 2-to-1 I2C-bus master selector in a TSSOP16 package. It operates within a power supply voltage range of 2.3 V to 5.5 V and supports clock frequencies from 0 Hz to 400 kHz. The device features active LOW interrupt inputs and outputs, an active LOW reset input, and four address pins for up to 16 devices. It provides bus initialization/recovery functions, voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses, and low standby current. All I/O pins are 6.0 V tolerant.

Specialized Feature Summary

• 2-to-1 bidirectional master selector with I2C-bus interface logic compatible with SMBus standards
• PCA9541/01 powers up with Channel 0 selected
• Active LOW interrupt input, 2 active LOW interrupt outputs, and active LOW reset input
• Bus initialization/recovery function and bus traffic sensor

Specialized Applications

• High reliability systems with dual masters
• Gatekeeper multiplexer on long single bus
• Bus initialization/recovery for slave devices without hardware reset
• Allows masters without arbitration logic to share resources

Specialized Procurement Notes

Verify the component against official NXP documentation to confirm the specific suffix /01,118 indicates the TSSOP16 package variant with Channel 0 selected at start-up. Ensure compatibility with system voltage requirements and I2C addressing constraints before integration.

Specialized Selection Notes

Select this component for applications requiring high-reliability dual master I2C architectures where one master must be able to take control if the other fails or is removed. Consider the TSSOP16 package size and the need for external pull-up resistors on all channels when designing the circuit layout.

Specialized Part Context

The PCA9541 series includes variants like the PCA9541D/01 (SO16) and PCA9541BS/01 (HVQFN16). The /01 suffix denotes that Channel 0 is selected at start-up, whereas the /03 version selects no channel initially. This part belongs to the broader family of I2C bus controllers designed for redundant systems.

Specialized Replacement Considerations

Direct replacements include PCA9541D/01,118 and PCA9541BS/01,118, which offer identical functionality in different packages. Verify pinout compatibility and ensure the replacement maintains the same start-up channel selection behavior.