SI83408BFA-IFR

Overview

The SI83408BFA-IFR is a quad-channel isolated smart switch IC from Skyworks Solutions. It integrates four high-side and low-side N-channel power switches with magnetic coupling isolation rated at 1500Vrms. The device supports a wide supply voltage range of 2.25V to 5.5V for logic and 9V to 32V for the load side. Each channel delivers an output current of 700mA with a maximum on-resistance of 155mΩ. Key electrical parameters include a current limit of 880mA, a maximum turn-on time of 2.5µs, and a maximum blanking time of 3.5µs. It operates within a temperature range of -40°C to +125°C in a 32-DFN package.

Feature Summary

• Integrates four isolated power channels with magnetic coupling technology for robust signal transmission across isolation barriers.
• Provides comprehensive protection features including overcurrent limiting and thermal shutdown to safeguard connected loads.
• Supports flexible power distribution configurations with independent control inputs for each channel.

Applications

• Industrial automation systems requiring isolated digital voltage level translation
• Power distribution units in industrial machinery
• Smart grid infrastructure components

Procurement Notes

Verify the specific suffix 'IFR' indicates tape-and-reel packaging when ordering. Confirm that the 1500Vrms isolation rating meets system safety requirements. Ensure the 32-DFN (9x9) footprint matches the PCB layout design. Check for RoHS compliance status as per the manufacturer's latest documentation before finalizing procurement specifications.

Selection Notes

Select this component for applications requiring high-density power switching with galvanic isolation. The quad-channel configuration reduces board space compared to discrete solutions. Consider the 700mA continuous current capability and 155mΩ on-resistance for efficiency calculations. Verify that the 9V to 32V load voltage range aligns with the target application's power rails.

Part Context

This part belongs to the Si834xx family of isolated smart switches. These devices are designed to replace traditional relay or optocoupler-based switching solutions. The family offers integrated protection and control features in a compact surface-mount package. The SI83408 variant specifically provides four independent channels for complex power management tasks.

Replacement Considerations

The SI83408BFA-IF is the non-reel version of this component. Verify pinout compatibility if substituting with other quad-channel isolated switches from different manufacturers. Ensure isolation voltage ratings and current limits meet or exceed original design specifications.