SI88420BD-ASR

Overview

The SI88420BD-ASR is a dual-channel digital isolator from the Si88x2x family, manufactured by Skyworks Solutions. It integrates an on-chip isolated DC-DC converter capable of delivering regulated output voltages of 3.3 V or 5.0 V with peak power up to 5 W using external components. The device supports data rates up to 100 Mbps and features a typical propagation delay of 18 ns. It operates within a supply voltage range of 3 V to 5.5 V and provides isolation ratings of up to 5000 Vrms. The component is housed in a SOIC-20 wide-body package and functions across a temperature range of -40°C to +125°C.

Feature Summary

• Integrates two unidirectional digital isolation channels with capacitive coupling technology for robust signal transmission.
• Includes an internal DC-DC controller with secondary sensing feedback to regulate isolated power domains without optocouplers.
• Features high electromagnetic immunity and ultra-low emissions through dithering mechanisms in the switching converter.
• Certified by UL, CSA, VDE, and CQC for reinforced and basic insulation safety standards.

Applications

• Industrial automation systems
• Hybrid electric and electric vehicles
• Isolated power supplies
• Motor control circuits
• Data acquisition systems

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and tape/reel specifications. Ensure compatibility with required isolation barriers and input/output voltage configurations before integration into the design.

Selection Notes

Select this component when a combined solution for signal isolation and isolated power generation is required. Consider the external transformer requirements and loop compensation needs for the integrated DC-DC converter. Verify that the primary side voltage does not exceed the limits for the internal switches if no external FET is utilized.

Part Context

This part belongs to the Si88x2x family of dual digital isolators with integrated DC-DC converters. It shares architectural similarities with the Si8832x, Si8842x, and Si8862x series, differing primarily in pinout configurations and specific DC-DC converter feature sets such as shutdown and frequency control options.

Replacement Considerations

Check Skyworks documentation for direct pin-compatible alternatives within the Si88x2x family. Verify that any substitute maintains the same isolation voltage rating, channel count, and DC-DC converter capabilities.