SI88321EC-IS

Digital Isolators Overview

The SI88321EC-IS is a Skyworks Solutions digital isolator featuring two unidirectional channels with an integrated DC-DC converter. It provides 3750 Vrms isolation voltage using capacitive coupling technology. The device supports data rates up to 100 Mb/s and operates within a supply voltage range of 3 V to 5.5 V. Key electrical parameters include a propagation delay of 18 ns, rise/fall times of 2.5 ns, and a typical common-mode transient immunity of 40 kV/µs. It is housed in a 20-SOIC package and is qualified under AEC-Q100 standards for automotive applications.

Digital Isolators Feature Summary

• Integrates a 2W DC-DC converter to provide isolated power generation alongside signal isolation
• Utilizes silicon-based capacitive coupling technology for high reliability and low power consumption
• Features unidirectional signal paths with shutdown capability for power management
• Meets AEC-Q100 qualification requirements for automotive electronic environments

Digital Isolators Applications

• Automotive inverter and motor drive systems
• Industrial programmable logic controller (PLC) input/output modules
• Servo motor control interfaces
• Isolated gate driver power supplies

Digital Isolators Procurement Notes

Verify the specific ordering suffix to confirm packaging type; 'IS' indicates tube packaging while 'ISR' denotes tape and reel. Confirm that the required isolation voltage rating of 3750 Vrms aligns with system safety standards. Ensure the integrated DC-DC converter output matches the load requirements of the isolated side circuitry before finalizing procurement.

Digital Isolators Selection Notes

Select this component when both signal isolation and isolated power generation are required in a single package. The 100 Mb/s data rate suits moderate-speed communication needs. Consider the 20-SOIC footprint for board space constraints. Verify thermal dissipation capabilities as the integrated converter contributes to total power dissipation within the specified operating temperature range.

Digital Isolators Part Context

This part belongs to the Si88xx ISOvolt family, which combines digital isolation with integrated DC-DC conversion. It replaces traditional solutions requiring separate isolators and isolated power supplies. The series targets applications demanding high channel density and reduced bill-of-materials complexity in industrial and automotive sectors.

Digital Isolators Replacement Considerations

Direct substitutes within the same family include the SI88320EC-IS, which shares similar specifications but may differ in specific current ratings or package variants. Cross-family replacements require careful evaluation of isolation voltage, data rate, and pin compatibility to ensure functional equivalence without redesigning the PCB layout.