PCA9541BS/03,118

Specialized Overview

The PCA9541BS/03,118 is a 2-to-1 I2C-bus master selector designed for high-reliability dual-master applications. 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 allowing up to 16 devices on the bus. It enables voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses while maintaining 6.0 V tolerant inputs. The component is housed in an HVQFN16 package with dimensions of 4 x 4 x 0.85 mm.

Specialized Feature Summary

• Provides bidirectional switching between two upstream I2C masters and a single downstream slave channel
• Includes interrupt logic and reset functionality for system initialization and status monitoring
• Supports hot insertion and allows voltage level translation across multiple bus voltages

Specialized Applications

• High reliability systems with dual masters
• Gatekeeper multiplexer on long single bus
• Bus initialization/recovery for slave devices without hardware reset

Specialized Procurement Notes

Verify the specific ordering suffix /03,118 against the manufacturer's current documentation to confirm availability and exact packaging specifications. Ensure that the HVQFN16 package thermal pad requirements are met during PCB design to maintain proper operation and heat dissipation.

Specialized Selection Notes

Select this variant when a no-channel-selected startup state is required, as indicated by the /03 suffix. Confirm compatibility with the target operating temperature range of -40 °C to +85 °C. Verify that the 16-terminal HVQFN16 package footprint aligns with the available board space and manufacturing capabilities.

Specialized Part Context

This component belongs to the PCA9541 family of I2C bus master selectors manufactured by NXP Semiconductors. The BS designation specifically identifies the HVQFN16 plastic thermal enhanced very thin quad flat package version. The /03 suffix denotes the configuration where no channel is selected at start-up, allowing either master to take control via arbitration.

Specialized Replacement Considerations

PCA9541A is a documented upgrade within the same family offering similar functionality.