SI83408AFA-IFR

Overview

The SI83408AFA-IFR is a four-channel isolated smart switch from Skyworks Solutions, designed for power distribution applications. It integrates high-side and low-side switches within a single DFN-32 package. The device supports an input voltage range of 9 V to 32 V and operates with control logic voltages between 2.25 V and 5.5 V. Key electrical specifications include a maximum on-resistance of 155 mOhms, a continuous output current of 700 mA, and a current limit of 880 mA. Switching characteristics feature a maximum turn-on time of 2.5 µs and a maximum turn-off time of 3.5 µs. The component functions reliably across an extended temperature range from -40 °C to +125 °C.

Feature Summary

• Integrates four independent high-side and low-side power switches in a compact surface-mount package
• Provides galvanic isolation between the control logic interface and the power load circuitry
• Includes integrated protection mechanisms against overcurrent conditions and thermal stress

Applications

• Industrial automation power distribution systems
• Automotive electronic control unit (ECU) peripheral loads
• Telecommunications infrastructure equipment power management

Procurement Notes

Verify the specific suffix 'IFR' confirms the reel packaging format required for automated assembly processes. Confirm that the DFN-32 package dimensions align with the target PCB footprint. Ensure design compatibility with the specified 9 V to 32 V operating range and check moisture sensitivity level handling requirements during storage and soldering.

Selection Notes

Select this component when four isolated channels are required for simultaneous load control. Compare the 155 mOhm on-resistance against alternative devices to evaluate conduction losses. Verify that the 700 mA continuous current rating meets the peak and steady-state demands of the connected loads without exceeding the 880 mA current limit threshold.

Part Context

This part belongs to the Si834xx family of isolated smart switches. The family provides modular solutions for managing multiple power rails with integrated safety features. The Si83408 variant specifically offers four channels, distinguishing it from lower-channel-count models like the Si83404 or single-channel options within the same series.

Replacement Considerations

The Si83404AAA-IFR serves as a verified substitute within the same product family, offering identical electrical performance but with only two output channels instead of four.