SI88444BD-ISR

Overview

The SI88444BD-ISR is a high-speed digital isolator from the Si88444 series, manufactured by Skyworks Solutions. It features four unidirectional channels with capacitive coupling technology and an integrated DC-DC converter for isolated power delivery. The device supports data rates up to 100 Mb/s and provides 5000 Vrms isolation voltage. Operating on a supply voltage between 3 V and 5.5 V, it exhibits a propagation delay of 18 ns and rise/fall times of 2.5 ns. The component is housed in a SOIC-20 package, operates within a temperature range of -40°C to +125°C, and includes a shutdown function.

Feature Summary

• Integrates a DC-DC converter to provide isolated power supply capability
• Utilizes capacitive coupling technology for signal transmission
• Supports general-purpose applications with unidirectional channel configuration

Applications

• General-purpose digital isolation circuits
• Industrial automation systems requiring galvanic isolation
• Medical equipment needing high-voltage isolation barriers

Procurement Notes

Verify the specific suffix 'ISR' indicates the reel packaging format and SOIC-20 wide body variant. Confirm the device status as Not Recommended for New Designs (NRND) before finalizing procurement plans. Ensure compatibility with existing PCB footprints for the SOIC-20 package. Check for RoHS compliance details in the official datasheet. Validate that the integrated DC-DC requirement aligns with system power architecture.

Selection Notes

Select this component when an integrated isolated power source is required alongside signal isolation. The unidirectional nature limits use cases to single-direction data flow. Consider the 100 Mb/s data rate limit for bandwidth requirements. The wide operating temperature range suits harsh industrial environments. Verify that the 5000 Vrms isolation rating meets safety standards for the target application.

Part Context

This part belongs to the Si88444 family of high-data-rate digital isolators. It distinguishes itself by incorporating an internal DC-DC converter, eliminating the need for external isolated power supplies. The SI88444BD-ISR specifically denotes the reel-packaged version in a SOIC-20 footprint. It complements other variants like the SI88444BD-AS which lacks the integrated converter.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. The SI88444ED-ISR is listed as NRND. Designers should consult Skyworks Solutions for current recommended replacements or alternative families.