SI88440EC-IS

Overview

The SI88440EC-IS is a quad digital isolator from Skyworks Solutions, featuring an integrated secondary-sensing feedback-controlled DC-DC converter. It provides 3750 Vrms isolation voltage with capacitive coupling technology. The device supports unidirectional data transmission at speeds up to 100 Mb/s across four forward channels, with zero reverse channels. Key electrical parameters include a maximum propagation delay of 18 ns, rise and fall times of 2.5 ns, and pulse width distortion of 7 ns. It operates within a supply voltage range of 3 V to 5.5 V and is qualified for AEC-Q100 standards. The component is housed in a 20-SOIC (Wide) package and functions reliably between -40°C and +125°C.

Feature Summary

• Integrated secondary-sensing feedback-controlled DC-DC converter for isolated power generation
• High common-mode transient immunity capability for noise-resistant signal integrity
• Capacitive coupling isolation technology ensuring robust signal transmission

Applications

• Automotive electronic control units requiring AEC-Q100 qualification
• Industrial automation systems needing high-speed isolated communication
• Medical equipment demanding reliable galvanic isolation

Procurement Notes

Verify the specific suffix 'IS' corresponds to the tube packaging format as indicated in distributor specifications. Confirm that the AEC-Q100 qualification status meets your automotive or industrial reliability requirements. Ensure the 3750 Vrms isolation rating aligns with your system's safety standards. Check for any recent lifecycle notices, such as NRND status, which may affect long-term availability. Validate pinout compatibility with your existing PCB layout before finalizing procurement decisions.

Selection Notes

Select this component when a quad-channel unidirectional isolator with integrated power conversion is required. The 100 Mb/s data rate suits general-purpose protocols like SPI, I2C, and UART. The wide operating temperature range makes it suitable for harsh environments. Consider the 20-SOIC package dimensions for space-constrained designs. The integrated DC-DC converter simplifies board design by eliminating external isolated power supplies.

Part Context

This part belongs to the Si88440 series of digital isolators from Skyworks Solutions. It shares architectural similarities with other members like the SI88440ED-ISR but differs in isolation voltage ratings and packaging options. The series is designed for applications requiring high-speed data transfer across isolation barriers with built-in power management capabilities.

Replacement Considerations

The SI88440ED-ISR offers similar functionality but features a higher 5000 Vrms isolation rating and comes in a reel package. Note that the ED variant is marked as Not Recommended for New Designs (NRND). Verify if the lower 3750 Vrms rating of the EC-IS variant is sufficient for your specific application safety margins.