SI88421BD-ASR

Overview

The SI88421BD-ASR is a dual-channel digital isolator with an integrated isolated DC-DC converter manufactured by Skyworks Solutions. It operates within a supply voltage range of 3 V to 5.5 V and supports data rates up to 100 Mb/s. The device provides 5000 Vrms isolation via capacitive coupling and features unidirectional signal paths. Key electrical parameters include a typical propagation delay of 18 ns, maximum rise and fall times of 2.5 ns, and a pulse width distortion of 4.5 ns. It functions reliably across a temperature range of -40 °C to +125 °C and is housed in a SOIC-16 wide-body package.

Feature Summary

• Integrates two unidirectional digital isolation channels with an on-chip isolated DC-DC converter for power delivery.
• Utilizes capacitive coupling technology to provide high electromagnetic immunity and ultra-low emissions.
• Includes secondary sensing feedback control for the DC-DC converter to ensure precise output regulation.

Applications

• Industrial automation systems
• Hybrid electric and electric vehicles
• Isolated power supplies

Procurement Notes

Verify component authenticity through official manufacturer channels or authorized distributors. Confirm that the part number matches the specific ordering suffix requirements for your application. Ensure compliance with RoHS standards and check for any relevant safety certifications such as UL, CSA, or VDE before integration into final designs.

Selection Notes

Select this component when a combined solution for signal isolation and isolated power generation is required. The SI88421BD-ASR is suitable for applications needing 5000 Vrms isolation with minimal external passive components. Consider the SOIC-16 package dimensions and thermal characteristics during PCB layout planning to ensure adequate heat dissipation and spacing compliance.

Part Context

This device belongs to the Si88x2x family from Skyworks Solutions, which combines digital isolation with integrated DC-DC conversion capabilities. The family offers various channel configurations and isolation ratings to suit different industrial and automotive needs. The SI88421BD-ASR specifically provides two unidirectional channels with an integrated converter, distinguishing it from variants with bidirectional channels or separate power options.

Replacement Considerations

Consult the official datasheet for direct pin-compatible alternatives within the Si8842x series. Verify functional equivalence regarding isolation voltage, data rate, and DC-DC converter specifications before substitution. Cross-reference with other manufacturers only if complete parameter matching is confirmed.