SI8645BB-AU

Digital Isolators Overview

The SI8645BB-AU is a quad-channel digital isolator from the Si864x series, manufactured by Skyworks Solutions Inc. It features capacitive coupling technology with a 2500 Vrms isolation voltage and supports data rates up to 150 Mb/s. The device operates on a single supply voltage ranging from 2.375 V to 5.5 V, drawing a typical operating current of 6.1 mA. It provides unidirectional signal transmission across four forward channels with zero reverse channels. Key timing parameters include an 8 ns propagation delay, 4 ns rise/fall times, and a pulse width of 5 ns. The component is housed in a QSOP-16 package and is qualified under AEC-Q100 standards for automotive applications.

Digital Isolators Feature Summary

• Capacitive coupling architecture ensures robust signal integrity across high-voltage barriers
• AEC-Q100 qualification confirms suitability for demanding automotive environments
• Low power consumption design enables efficient operation within specified voltage ranges
• High common-mode transient immunity protects against electrical noise interference

Digital Isolators Applications

• Automotive gate driver circuits for motor control
• Isolated communication interfaces in vehicle networks
• Power conversion systems requiring galvanic isolation
• Industrial automation control modules

Digital Isolators Procurement Notes

Verify the specific suffix 'AU' corresponds to the QSOP-16 tube packaging configuration as indicated in distributor listings. Confirm that the AEC-Q100 automotive qualification is active for this specific part number variant. Ensure compatibility with standard surface-mount assembly processes for the 16-pin small outline package. Cross-reference the manufacturer's latest datasheet to confirm any potential obsolescence notices or lifecycle status changes before finalizing procurement plans.

Digital Isolators Selection Notes

Select this component when a quad-channel isolator with 2500 Vrms basic insulation is required for automotive-grade applications. The 150 Mb/s data rate supports high-speed digital signaling needs. Consider the low power profile for battery-sensitive systems. Verify that the QSOP-16 footprint fits the target PCB layout constraints. Ensure the unidirectional channel configuration aligns with the system's signal flow requirements without needing reverse path isolation.

Digital Isolators Part Context

This device belongs to the Si864x family of low-power digital isolators. It shares architectural similarities with other members like the SI8645BA and SI8645BC but differs in insulation voltage ratings and package options. The family utilizes Skyworks' proprietary capacitive isolation technology, offering advantages over traditional magnetic or optical isolation methods in terms of size and power efficiency.

Digital Isolators Replacement Considerations

Direct substitutes within the same family include SI8645BA-AU (1 kV rating) and SI8645BC-B-IS1R (3.75 kV rating). Verify insulation voltage requirements match the application before swapping. Check package compatibility if replacing with SOIC variants.