SI8642BB-ASR

Overview

The SI8642BB-ASR is a four-channel digital isolator from the Si864x series, manufactured by Skyworks Solutions. It features unidirectional signal transmission with two forward and two reverse channels. The device operates on a supply voltage ranging from 2.375 V to 5.5 V and supports data rates up to 150 Mb/s. It provides an insulation voltage of 2500 Vrms using capacitive coupling technology. Key electrical parameters include a propagation delay of 8 ns, rise and fall times of 4 ns, and a maximum power dissipation of 275 mW. The component is housed in a SOIC-Wide-16 package and is qualified under AEC-Q100 standards for automotive applications.

Feature Summary

• Provides galvanic isolation between circuits using robust capacitive coupling technology.
• Supports high-speed digital signal transmission with low propagation delay characteristics.
• Includes a dedicated shutdown pin to minimize power consumption during idle states.
• Complies with automotive reliability standards for use in demanding environments.

Applications

• Automotive electronic control units requiring isolated communication interfaces
• Industrial automation systems utilizing isolated sensor data acquisition
• Power conversion equipment needing feedback loop isolation

Procurement Notes

Verify the specific suffix ASR against official Skyworks documentation to confirm reel packaging specifications and moisture sensitivity levels. Ensure compatibility with AEC-Q100 requirements if deploying in automotive contexts. Cross-reference the SOIC-Wide-16 footprint dimensions with PCB layout guidelines to prevent assembly errors. Confirm that the 2500 Vrms isolation rating meets the safety standards of the target application environment.

Selection Notes

Select this component when a four-channel unidirectional isolator with automotive qualification is required. Compare the 2500 Vrms isolation level against higher voltage alternatives like the SI8642BD series if system demands exceed this rating. Evaluate the 150 Mb/s data rate capability against protocol speed requirements. Consider the SOIC-Wide-16 package size relative to available board space compared to narrower variants.

Part Context

This part belongs to the Si864x family of digital isolators, which utilizes Skyworks' proprietary capacitive isolation technology. The family offers various channel configurations and isolation voltages. The SI8642BB variant specifically addresses the need for four-channel isolation with automotive grade reliability, distinguishing it from standard industrial versions through its qualification status and thermal performance characteristics.

Replacement Considerations

The SI8642BB-B-IU serves as a tube-packaged alternative within the same functional family. Verify pinout compatibility and package dimensions before substitution. Ensure the replacement maintains the required AEC-Q100 qualification and 2500 Vrms isolation rating for the intended application.