SI88420BD-AS

Overview

The SI88420BD-AS is a dual-channel digital isolator with an integrated isolated DC-DC converter, manufactured by Skyworks Solutions. It provides up to two unidirectional digital isolation channels and regulates output voltages of 3.3 V or 5.0 V at peak power levels up to 5 W. The device supports data rates up to 100 Mbps with a typical propagation delay of 18 ns. It features high transient immunity of 100 kV/µs and operates within a temperature range of -40°C to +125°C. The component utilizes capacitive coupling for isolation and is available in SOIC-Wide-16 and SOIC-20 packages.

Feature Summary

• Integrates a fully-isolated secondary sensing feedback controlled DC-DC converter with dithering for low electromagnetic interference (EMI).
• Provides high-speed digital isolation channels with precise timing characteristics and robust noise immunity.
• Includes safety regulatory approvals from UL, CSA, VDE, and CQC for reinforced and basic insulation applications.

Applications

• Industrial automation systems
• Hybrid electric and electric vehicles
• Isolated power supplies
• Inverters
• Motor control

Procurement Notes

Verify the manufacturer designation as Skyworks Solutions, Inc., despite the input brand reference. Confirm the specific package variant (SOIC-Wide-16 or SOIC-20) required for the design. Ensure compatibility with the required isolation voltage ratings and operating temperature ranges specified in the official datasheet before procurement.

Selection Notes

Select this component when a combined digital isolator and isolated power supply solution is needed to reduce external component count. Consider the SI8842x series for high-voltage primary side applications requiring external power switches. Verify that the required number of digital channels and isolation barrier ratings meet the system safety standards.

Part Context

This part belongs to the Si88x2x family, which integrates Skyworks' digital isolator technology with on-chip isolated DC-DC converters. The family offers options for various DC-DC converter features, isolation channel configurations, and fail-safe modes. These devices are designed to provide substantial advantages in data rate, propagation delay, size, and reliability over legacy isolation technologies.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the verified source material. Consult the official Skyworks documentation for recommended alternatives or cross-reference with similar parts in the Si88xx family based on channel count and isolation requirements.