SI88421ED-ASR

Overview

The SI88421ED-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 (or >5 V with external components) 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 and offers isolation ratings of up to 5000 Vrms. It operates within a supply voltage range of 3 V to 5.5 V and functions across a temperature range of -40 °C to +125 °C. The component is housed in a 16-pin SOIC-Wide package.

Feature Summary

• Integrates a fully-controlled isolated DC-DC converter with secondary sensing feedback for low EMI emissions.
• Provides two unidirectional digital isolation channels utilizing capacitive coupling technology.
• Includes user-adjustable frequency control, soft-start functionality, and loop compensation options.
• Certified by UL, CSA, VDE, and CQC for safety regulatory compliance.

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm pinout compatibility and feature set. Confirm that the required external transformer and passive components match the design guide specifications for the intended input and output voltage configuration. Ensure the selected package variant meets the thermal and mechanical requirements of the target application environment.

Selection Notes

Select this component when a high-speed digital isolator with integrated isolated power generation is required. The Si88421ED-ASR is suitable for applications needing up to 5 W of isolated power without external optocouplers. Consider the external switch driver capability if primary side voltages exceed 5.5 V. Verify that the 16-pin SOIC-Wide package fits the PCB layout constraints and that the 100 Mbps data rate meets system timing requirements.

Part Context

This part belongs to the Si88x2x family of dual digital isolators with DC-DC converters. The 'ED' suffix typically denotes the SOIC-16 wide body package, while 'ASR' indicates a reel packaging option. This family shares core architecture with other variants like the SI88421ED-IS but differs in packaging and potentially specific certification statuses. The device is designed to replace legacy isolation solutions offering superior size and reliability advantages.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Designers should consult the manufacturer's official replacement guide or contact technical support for validated cross-references.