SI8641BB-B-IS1

Overview

The SI8641BB-B-IS1 is a general-purpose digital isolator from the Si864x series, manufactured by Skyworks Solutions Inc. It features four unidirectional channels with capacitive coupling technology, providing an isolation voltage of 2500 Vrms. The device supports data rates up to 150 Mb/s and operates within a supply voltage range of 2.375 V to 5.5 V. Key electrical parameters include a propagation delay of 8 ns, rise and fall times of 4 ns, and a common-mode transient immunity of 35 kV/µs. It is housed in a 16-SOIC package and functions across a temperature range of -40°C to +125°C.

Feature Summary

• Capacitive coupling technology for high-speed signal transmission
• Unidirectional channel configuration for isolated data paths
• High common-mode transient immunity for noise resilience
• No start-up initialization required for immediate operation

Applications

• General-purpose digital isolation in industrial systems
• Isolation for sensor interfaces and data acquisition
• Power supply control circuit isolation
• Gate driver isolation for power electronics

Procurement Notes

Verify the specific suffix 'B' and 'IS1' against the manufacturer's current datasheet to ensure alignment with the 2.5 kVrms insulation rating and tube packaging format. Confirm that the 16-SOIC narrow body dimensions match your PCB footprint requirements. Check for any recent Product Change Notifications (PCN) regarding assembly sources or material compliance updates before finalizing procurement orders.

Selection Notes

Select this component when a 2.5 kVrms isolation barrier is sufficient for the application, as opposed to the higher 3.75 kVrms variants like the SI8641BC. Ensure the system design accommodates the 2.375 V minimum supply voltage. Consider the 150 Mbps data rate limit and 8 ns propagation delay for timing-critical applications. Verify that the unidirectional channel topology meets the signal flow requirements of the target circuit.

Part Context

This part belongs to the Si864x family of digital isolators, which utilize Skyworks' proprietary capacitive coupling technology. The family offers various channel counts and isolation ratings. The SI8641BB variant specifically provides four unidirectional channels with a 2.5 kVrms rating, distinguishing it from other family members that may offer bidirectional channels or higher insulation voltages.

Replacement Considerations

The SI8641BC-B-IS1 serves as a direct substitute if a higher 3.75 kVrms isolation rating is required while maintaining identical pinout and performance characteristics. Other Si864x series parts may be compatible if channel count and directionality align, but verification of insulation voltage and package dimensions is mandatory.