SI8645BB-B-IS1R

Digital Isolators Overview

The SI8645BB-B-IS1R is a quad-channel digital isolator from Skyworks Solutions, utilizing capacitive coupling technology. It features a 3750 Vrms insulation voltage and supports data rates up to 150 Mb/s. The device operates within a supply voltage range of 2.375 V to 5.5 V, with a maximum power dissipation of 275 mW. Propagation delay is typically 8 ns, with rise and fall times of 4 ns. It is housed in a 16-pin SOIC-Narrow package, rated for operation between -40°C and +125°C, and holds AEC-Q100 qualification.

Digital Isolators Feature Summary

• Provides galvanic isolation via high-reliability capacitive coupling technology
• Supports unidirectional signal transmission across four independent channels
• Ensures high common-mode transient immunity for robust noise rejection
• Delivers ultra-low power consumption suitable for energy-efficient designs

Digital Isolators Applications

• Automotive electronic control units requiring AEC-Q100 compliance
• Industrial motor drives and power conversion systems
• General-purpose isolated communication interfaces
• Medical equipment requiring certified electrical isolation

Digital Isolators Procurement Notes

Verify the specific suffix 'B' indicates the standard performance grade and 'IS1R' denotes the tape-and-reel packaging format. Confirm that the 3750 Vrms rating aligns with your system's isolation requirements rather than higher-rated variants like the ET series. Ensure compatibility with the SOIC-Narrow-16 footprint during PCB layout. Cross-reference the datasheet for any recent product change notices affecting assembly or sourcing.

Digital Isolators Selection Notes

Select this component when bidirectional isolation is not required, as it supports only forward channels. Compare against the SI8645BD-B-IS if tube packaging is preferred over reel. Consider the SI8645ET-AS2R if a higher 5 kV insulation rating is necessary for automotive applications. Evaluate the SI8640BB-B-IS1R if a lower 2.5 kV rating suffices for cost optimization. Verify thermal management needs given the 275 mW power dissipation limit.

Digital Isolators Part Context

This part belongs to the Si864x family of ultra-low-power digital isolators. It complements other members like the SI8645BB-B-IS (tube) and SI8645BC-B-IS1R (different insulation rating). The family shares similar pinouts and functional characteristics, differing primarily in insulation voltage, packaging, and channel configuration. It serves as a key solution for replacing optocouplers in modern isolated circuits.

Digital Isolators Replacement Considerations

Public confirmed substitutes include SI8645BB-B-IS for tube packaging and SI8645BC-B-IS1R for 3.75 kV isolation in reel format. Direct replacements must maintain the 16-SOIC-Narrow package and 4-channel unidirectional topology.