SI88621BC-ISR

Overview

The SI88621BC-ISR is a Skyworks Solutions digital isolator featuring two unidirectional channels and an integrated DC-DC converter. It utilizes capacitive coupling for isolation with a rated insulation voltage of 3750 Vrms. The device supports data rates up to 100 Mb/s, with typical propagation delays of 18 ns and rise/fall times of 2.5 ns. It operates within a supply voltage range of 3 V to 5.5 V and draws approximately 8 mA of working power current. The component is housed in a 20-SOIC package and is qualified under AEC-Q100 standards for automotive applications.

Feature Summary

• Integrates a high-efficiency DC-DC converter to provide isolated power supply capability alongside signal isolation.
• Employs capacitive coupling technology to achieve robust galvanic isolation between circuit domains.
• Features unidirectional signal transmission paths optimized for specific directional data flow requirements.

Applications

• Automotive electronic control units requiring certified isolation components
• Industrial communication interfaces needing reliable signal transmission across potential barriers
• Power conversion systems utilizing integrated isolated power and data channels

Procurement Notes

Verify the suffix ISR corresponds to reel packaging when sourcing. Confirm AEC-Q100 qualification status if automotive compliance is mandatory. Ensure the 3750 Vrms insulation rating meets system safety requirements. Check moisture sensitivity level handling procedures during assembly. Validate pinout compatibility with target PCB footprint before integration.

Selection Notes

Choose this model when both signal isolation and isolated power generation are required in a single package. The unidirectional channel configuration suits applications where data flows in one direction only. Consider the 100 Mb/s speed limit against system timing requirements. The SOIC-20 package offers a balance of isolation creepage distance and board space efficiency.

Part Context

This component belongs to the Si8862x series of digital isolators from Skyworks Solutions. It is designed for high-reliability applications demanding combined power and data isolation. The part integrates advanced capacitive isolation technology with on-chip power management. It serves as a compact solution for replacing discrete transformer or optocoupler-based designs.

Replacement Considerations

• SI88621BD-ISR

FAQ

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

The datasheet specifies a minimum CMTI of 40 kV/µs for the SI88621BC-ISR.

Does the SI88621BC-ISR support bidirectional data transmission?

No, this specific variant features unidirectional channels only.