SI8642BB-AU

Overview

The SI8642BB-AU is a low-power, quad-channel digital isolator from the Si864x series, designed for automotive applications. It features capacitive coupling isolation with a rated insulation voltage of 2500 Vrms. The device supports data rates up to 150 Mb/s and operates on a supply voltage range of 2.375 V to 5.5 V. It includes two forward and two reverse channels with unidirectional signal flow. Key electrical parameters include a propagation delay of 8 ns, rise/fall times of 4 ns, and a typical operating current of 11 mA. It functions within a temperature range of -40°C to +125°C and holds AEC-Q100 qualification.

Feature Summary

• Provides galvanic isolation between circuits using capacitive coupling technology
• Supports high-speed data transmission up to 150 Mbps without start-up initialization
• Includes integrated shutdown functionality for power management
• Qualified for automotive reliability standards

Applications

• Automotive electronic control units (ECUs)
• Inverter gate drive isolation
• Isolated communication interfaces in harsh environments

Procurement Notes

Verify the specific suffix 'AU' corresponds to the QSOP-16 package and industrial/automotive temperature grade. Confirm AEC-Q100 certification requirements match the target application's reliability standards. Check moisture sensitivity level handling procedures during assembly. Ensure supply voltage inputs remain within the 2.375 V to 5.5 V operational limits.

Selection Notes

Select this component when four isolated channels are required for bidirectional or unidirectional data transfer in automotive systems. Compare against other Si864x variants if different channel configurations or higher isolation voltages are needed. Consider the 150 Mbps speed limit for bandwidth requirements. Evaluate power consumption against system constraints given the 11 mA typical current draw.

Part Context

This part belongs to the Skyworks Si864x family of low-power digital isolators. These devices utilize silicon dioxide isolation technology to replace traditional magnetic couplers. The family offers various channel counts and isolation ratings, with the SI8642 specifically providing a quad-channel configuration optimized for cost-sensitive and space-constrained designs.

Replacement Considerations

Check Skyworks documentation for direct pin-compatible replacements within the Si864x series that may offer updated packaging or revised qualification statuses.