SI88644BC-ISR

Overview

The SI88644BC-ISR is a Skyworks digital isolator featuring four unidirectional channels with integrated DC-DC converter capability. It utilizes capacitive coupling technology to provide 5000 Vrms isolation voltage and supports data rates up to 100 Mb/s. The device operates within a supply voltage range of 3V to 5.5V and is housed in a 24-SOIC package. Key electrical specifications include a common-mode transient immunity of 40 kV/µs, a propagation delay of 18 ns, and pulse width distortion of 4.5 ns. It functions reliably across an operating temperature range from -40°C to +125°C.

Feature Summary

• Integrates four high-speed digital isolation channels with capacitive coupling technology for robust signal transmission.
• Provides enhanced noise immunity through a common-mode transient immunity rating of 40 kV/µs.
• Includes built-in power-on reset functionality to ensure safe initialization upon power application.
• Features fail-safe output design to maintain defined logic states during fault conditions.

Applications

• Industrial automation systems requiring galvanic isolation between control and field devices
• Power electronics interfaces for monitoring and control circuits
• Medical equipment needing high-voltage isolation for patient safety compliance
• Smart grid infrastructure communication modules

Procurement Notes

Verify the specific suffix 'ISR' corresponds to the reel packaging format when sourcing components. Confirm that the 24-SOIC footprint matches the target PCB layout dimensions. Ensure the procurement channel provides valid RoHS compliance documentation. Cross-reference the manufacturer part number against official Skyworks databases to avoid counterfeit risks. Validate that the component meets the required humidity sensitivity level for the intended assembly process.

Selection Notes

Select this component when high-channel density and strong common-mode noise rejection are critical. The 40 kV/µs CMTI rating makes it suitable for noisy environments like motor drives or inverters. Consider the 18 ns propagation delay for timing-sensitive applications. The integrated DC-DC converter option reduces external component count compared to discrete solutions. Evaluate the 24-SOIC package size against available board space constraints.

Part Context

This device belongs to the Skyworks Si886xx series of digital isolators, which are designed for general-purpose isolation applications. The series emphasizes high reliability and compact form factors using proprietary capacitive isolation technology. The SI88644 variant specifically targets applications requiring multiple isolated channels within a single package. It complements other Skyworks interface solutions by providing robust signal integrity in electrically hostile environments.

Replacement Considerations

The SI88644BC-IS is a tube-packaged alternative to the ISR reel version. Verify pinout compatibility before substitution. Check if the replacement package offers identical thermal characteristics. Ensure the substitute maintains the same 5000 Vrms isolation rating and 100 Mb/s data rate. Confirm that the lead time and availability align with production schedules.