SI83405BFA-IFR

Overview

The SI83405BFA-IFR is a single-channel isolated smart switch from Skyworks Solutions. It integrates a high-side N-channel power switch with digital isolation, supporting up to 2.5 A output current and a maximum on-resistance of 155 mOhms. The device operates within a supply voltage range of 2.25 V to 5.5 V for the control side and 9 V to 32 V for the load side. Key electrical parameters include an 880 mA current limit, 2.5 us turn-on time, and 3.5 us fall time. It functions across a temperature range of -40°C to +125°C in a 32-DFN package.

Feature Summary

• Integrates a single high-side N-channel power switch with SPI interface for independent channel control
• Provides robust digital isolation between control logic and high-voltage load domain
• Includes built-in protection mechanisms such as over-current limiting and thermal shutdown

Applications

• Industrial motor control systems requiring isolated switching
• Power distribution units in automation equipment
• Smart grid infrastructure and energy metering devices

Procurement Notes

Verify the specific suffix 'IFR' indicates reel packaging when ordering. Confirm that the 32-DFN footprint matches your PCB design constraints. Ensure the SPI interface compatibility aligns with your microcontroller or controller unit. Check for moisture sensitivity levels if storage conditions are critical. Validate the operating voltage ranges against your system's power rails before finalizing procurement.

Selection Notes

Select this component for applications requiring a single isolated high-side switch with SPI control. Compare the 2.5 A current rating against your load requirements to ensure adequate headroom. Consider the 155 mOhms on-resistance for efficiency calculations. Evaluate the need for digital isolation versus other topologies. Verify the 32-DFN package size fits within your spatial limitations.

Part Context

This part belongs to the Si834xx family of isolated smart switches. It complements multi-channel variants like the SI83404 and SI83408 by offering a single-channel solution. The family shares common features such as SPI interfaces and integrated protections. This specific model focuses on high-current single-load management with robust isolation capabilities.

Replacement Considerations

Direct substitutes may include other single-channel isolated smart switches from Skyworks or competitors. Verify pinout compatibility and SPI protocol support. Ensure equivalent current ratings and isolation voltages. Check for similar package dimensions to avoid PCB redesign.