SI88621BC-IS

Overview

The SI88621BC-IS is a digital isolator from the Si88621 series, manufactured by Skyworks Solutions Inc. It features two unidirectional channels with a data rate of 100 Mb/s and an insulation voltage of 3750 Vrms using capacitive coupling. The device includes an integrated DC-DC converter and operates on a supply voltage between 3 V and 5.5 V. Key electrical parameters include a propagation delay of 18 ns, rise/fall times of 2.5 ns, and a typical operating current of 8 mA. It supports pulse widths down to 10 ns with a maximum pulse width distortion of 4.5 ns. The component is housed in a 20-SOIC package, meets AEC-Q100 automotive qualification standards, and functions within a temperature range of -40°C to +125°C.

Feature Summary

• Integrates a high-voltage DC-DC converter for isolated power generation
• Provides robust capacitive coupling isolation technology
• Supports unidirectional signal transmission with high common-mode transient immunity

Applications

• Automotive electronic control units requiring galvanic isolation
• Industrial communication interfaces such as CAN and LIN
• Medical equipment needing reinforced safety isolation

Procurement Notes

Verify the specific suffix 'IS' corresponds to tube packaging rather than reel packaging when sourcing. Confirm AEC-Q100 automotive qualification status is required for the intended application environment. Ensure the 20-SOIC footprint matches the PCB design constraints. Check moisture sensitivity level (MSL) requirements for reflow soldering processes. Validate that the integrated DC-DC converter output meets the load requirements of the isolated side circuitry.

Selection Notes

Select this component when a single-chip solution combining isolation and power conversion is necessary. The 2-channel unidirectional configuration suits simple data link applications. The 3750 Vrms rating provides adequate isolation for many industrial and automotive standards. Consider the 100 Mb/s speed limit against higher-speed protocol requirements. The SOIC-20 package offers a balance between pin count and board space efficiency.

Part Context

This part belongs to the Si88x2x family of digital isolators with integrated power supplies. It serves as a compact alternative to discrete isolation and power components. The Si88621BC variant specifically denotes the 3750 Vrms insulation rating. It complements other Skyworks isolation products like the SI86xx series which lack integrated converters.

Replacement Considerations

SI88621BD-ISR is a related variant with 5000Vrms isolation but uses reel packaging.