SI88642ED-AS

Overview

The SI88642ED-AS is a quad-channel digital isolator from Skyworks Solutions, housed in a 24-SOIC package. It provides unidirectional signal isolation with a data rate of 100 Mb/s and an insulation voltage of 5000 Vrms. The device operates on a supply voltage between 3 V and 5.5 V, drawing a typical operating current of 10.8 mA. Key electrical parameters include a propagation delay of 18 ns, rise/fall times of 25 ns, and pulse width distortion of 4.5 ns. It supports a wide operating temperature range from -40°C to +125°C without a shutdown function.

Feature Summary

• Provides galvanic isolation for four independent signal channels using capacitive coupling technology.
• Ensures high noise immunity against common-mode transients for reliable data transmission.
• Supports bidirectional logic interface configurations with dedicated forward and reverse channel paths.

Applications

• Industrial automation systems requiring isolated communication interfaces
• Medical equipment needing patient-side isolation barriers
• Power electronics control circuits with high-voltage separation requirements

Procurement Notes

Verify the specific suffix 'AS' corresponds to the tube packaging format rather than tape-and-reel variants like 'ASR'. Confirm RoHS compliance status through official Skyworks documentation before integration. Ensure design compatibility with the 24-SOIC footprint dimensions and thermal characteristics specified in the datasheet.

Selection Notes

Select this component when four isolated channels are required within a single compact package. The 100 Mb/s data rate suits standard industrial protocols. Consider the 5000 Vrms isolation rating for safety-critical applications. Verify that the unidirectional polarity meets the circuit's signal flow direction needs without additional inversion logic.

Part Context

This part belongs to the Si8864x family of CMOS digital isolators. It shares architectural similarities with other Skyworks isolation products but offers specific channel counts and pinout configurations tailored for general-purpose isolation tasks. The SOIC-24 package allows for efficient PCB layout in space-constrained designs.

Replacement Considerations

Check for direct substitutes such as the SI88642ED-IS variant, which may differ primarily in packaging or qualification standards. Ensure any replacement maintains identical pinout, isolation voltage, and data rate specifications to avoid redesigning the isolation barrier.