SI88421BD-IS

Digital Isolators Overview

The SI88421BD-IS is a dual-channel digital isolator with an integrated DC-DC converter, manufactured by Skyworks Solutions Inc. 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 features unidirectional signal transmission with a propagation delay of 18 ns and rise/fall times of 2.5 ns. It provides 5000 Vrms insulation via capacitive coupling and withstands a common-mode transient immunity of 40 kV/µs. Designed for industrial applications, it functions between -40°C and +125°C in a 16-pin SOIC-Wide package.

Digital Isolators Feature Summary

• Integrates a high-frequency DC-DC converter to provide isolated power supplies for both sides of the isolation barrier.
• Utilizes silicon dioxide (SiO2) capacitive coupling technology to ensure robust signal integrity across the isolation barrier.
• Includes a shutdown pin to disable the internal DC-DC converter, reducing power consumption during idle states.
• Offers high common-mode transient immunity to maintain reliable operation in electrically noisy environments.

Digital Isolators Applications

• Industrial automation systems requiring galvanic isolation between control logic and power stages.
• Medical equipment needing certified isolation for patient safety and signal accuracy.
• Power electronics interfaces such as motor drives and inverters.
• General-purpose digital communication links where bidirectional or unidirectional isolation is required.

Digital Isolators Procurement Notes

Verify the specific suffix 'ISR' against official Skyworks documentation, as standard listings often reference 'IS'. Confirm AEC-Q100 qualification status if automotive compliance is mandatory. Check current lifecycle status, as similar models may be marked NRND. Ensure ESD handling protocols are followed due to moisture sensitivity classification.

Digital Isolators Selection Notes

Select this component when a single IC must provide both signal isolation and isolated power generation. Compare total system BOM cost against discrete solutions using separate isolators and converters. Verify that the 100 Mb/s data rate meets application timing requirements. Ensure the 16-pin wide SOIC footprint fits the PCB layout constraints.

Digital Isolators Part Context

This part belongs to the Si884xx family of digital isolators with integrated DC-DC converters. It complements other Skyworks isolation products like the SI862x series, which offer similar functionality but may differ in channel count or certification levels. The family targets applications demanding compact designs with high reliability and low latency.

Digital Isolators Replacement Considerations

Direct substitutes include SI88420BD-IS (unidirectional, no reverse channels) and SI88421BD-BD-IS. Verify pinout compatibility and thermal performance before substitution. Cross-reference datasheets for exact parameter matching regarding propagation delay and isolation voltage ratings.