SI8451BB-A-IS1R

Overview

The SI8451BB-A-IS1R is a general-purpose digital isolator from Skyworks Solutions, featuring five channels with four unidirectional forward and one reverse channel. It operates within a supply voltage range of 2.7 V to 5.5 V and supports data rates up to 150 Mb/s. The device provides an isolation rating of 2500 Vrms and utilizes capacitive coupling technology. Key electrical parameters include a maximum propagation delay of 6 ns, a typical common-mode transient immunity of 25 kV/µs, and a pulse width distortion of 2.5 ns. It functions reliably across a temperature range of -40°C to +125°C and is housed in a 16-SOIC package.

Feature Summary

• Offers high-speed signal transmission with a data rate capability of 150 Mb/s for efficient system communication.
• Provides robust electrical isolation with a 2500 Vrms rating and significant common-mode transient immunity.
• Integrates a shutdown control feature to manage power consumption and isolate circuits when inactive.
• Delivers low propagation delay and minimal pulse width distortion for precise timing applications.

Applications

• Industrial automation systems requiring reliable signal isolation between microcontrollers and sensors
• Power supply circuits needing feedback isolation for monitoring and control
• Medical equipment interfaces demanding high safety standards and galvanic isolation
• Inverter gate drive circuits for motor control applications

Procurement Notes

Verify the specific suffix 'A' against the datasheet to confirm pinout and functional compatibility, as variations exist within the family. Confirm RoHS compliance status through official documentation before integration. Check for end-of-life or not-recommended-for-new-designations on current distributor listings to ensure long-term availability for production cycles.

Selection Notes

Select this component when high-speed data transfer is required alongside strong isolation capabilities. The 150 Mb/s rate suits applications faster than standard 1 Mb/s isolators but may require careful PCB layout for signal integrity. Ensure the operating voltage aligns with the 2.7 V to 5.5 V range and verify that the 16-SOIC package fits the design constraints.

Part Context

This part belongs to the SI845x family of ultra-low-power digital isolators by Skyworks Solutions. These CMOS devices are designed to replace traditional optocouplers, offering superior performance in speed, power consumption, and reliability. The family includes variants with different channel counts and isolation ratings, catering to diverse industrial and commercial needs.

Replacement Considerations

Direct substitutes within the same family include the SI8451BB-B-IS1R, which shares similar specifications but may differ in specific testing or manufacturing lot characteristics. Verify cross-compatibility with other SI845x series parts if channel count or isolation voltage requirements change.

FAQ

What is the typical common-mode transient immunity (CMTI) of the SI8451BB-A-IS1R?

The typical CMTI is 25 kV/µs, ensuring reliable operation in noisy environments with rapid voltage changes.

Does the SI8451BB-A-IS1R support bidirectional communication?

No, it features four unidirectional forward channels and one reverse channel, making it primarily suitable for directional signal isolation.