SI88444ED-AS

Overview

The SI88444ED-AS is a four-channel digital isolator from Skyworks Solutions, utilizing capacitive coupling technology for signal transmission. 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 an isolation voltage of 5000 Vrms and features unidirectional channel polarity with zero forward channels and four reverse channels. Key electrical parameters include a maximum propagation delay of 23 ns, a maximum rise time of 25 ns, and a maximum fall time of 25 ns. Pulse width distortion is specified at 4.5 ns. The component functions reliably across an operating temperature range of -40°C to +125°C.

Feature Summary

• Integrates four isolated channels using robust capacitive coupling technology for high-speed digital signal transmission.
• Provides certified safety isolation ratings recognized by major international standards organizations including UL, CSA, VDE, and CQC.
• Features low propagation delay and fast transition times to support high-frequency communication protocols.
• Operates on a single power supply rail with wide input voltage tolerance suitable for various logic families.

Applications

• Industrial automation systems requiring galvanic isolation between control and sensor domains
• Medical equipment interfaces needing certified safety isolation for patient-connected circuits
• Power electronics gate drive circuits in inverters and motor drives
• Data acquisition systems isolating analog-to-digital converter inputs from noisy environments

Procurement Notes

Verify the specific suffix 'AS' against your bill of materials, as it denotes the tube packaging variant distinct from reel options like 'ISR'. Confirm that the unidirectional channel configuration aligns with your circuit topology requirements. Ensure design compliance with the specified 5000 Vrms isolation rating for your application's safety standards. Check current availability status as distribution may vary by region.

Selection Notes

Choose this component when four independent unidirectional isolation paths are required within a single package. The 100 Mb/s data rate suits general-purpose applications but may limit use in ultra-high-speed serial links. Consider the SOIC-24 package dimensions for PCB layout constraints. Verify that the 3 V to 5.5 V supply range matches both the driver and receiver logic levels in your system design.

Part Context

This part belongs to the Si8844x family of CMOS digital isolators designed for high-reliability applications. The series emphasizes low power consumption and high common-mode transient immunity. Unlike bidirectional variants, this model focuses on one-way signal transfer, simplifying interface design for specific control architectures. It complements other Skyworks isolation products offering different channel counts or bidirectional capabilities.

Replacement Considerations

Direct substitutes include the SI88444ED-ISR, which shares identical electrical specifications but differs in packaging format (reel versus tube). Other family members like the SI88344ED-AS offer similar performance but may have different shutdown pin configurations or pulse width distortion characteristics. Always verify pinout compatibility and insulation clearance requirements before swapping components.

FAQ

What is the maximum common-mode transient immunity (CMTI) for this device?

The SI88444ED-AS achieves a common-mode transient immunity of 40 kV/µs, ensuring reliable operation in high-noise environments.

Does this component support bidirectional signal transmission?

No, the SI88444ED-AS is configured with unidirectional polarity, featuring zero forward channels and four reverse channels only.

Which safety certifications does this isolator hold?

The device is certified by UL, CSA, VDE, and CQC, meeting various international safety standards for industrial and medical applications.