SI83408AFA-IF

Overview

The Si83408AFA-IF is a four-channel isolated smart switch IC from Skyworks Solutions, designed for power distribution applications. It integrates high-side and low-side switches with an output current of 700 mA and a current limit of 880 mA. The device features a maximum on-resistance of 155 mOhms, ensuring efficient power delivery. It operates within a supply voltage range of 2.25 V to 5.5 V for logic and 9 V to 32 V for the load side. The component supports fast switching with a maximum turn-on time of 2.5 µs and a blanking time of 3.5 µs. It is housed in a DFN-32 package and functions reliably across an operating temperature range of -40°C to +125°C.

Feature Summary

• Integrates four independent isolated channels for flexible power distribution management
• Combines high-side and low-side switching capabilities within a single compact package
• Provides built-in current limiting protection to safeguard connected loads
• Supports digital control interfaces for precise operational monitoring and configuration

Applications

• Industrial automation systems requiring isolated power switching
• Automotive electronic control units (ECUs) for peripheral power management
• Telecommunications infrastructure equipment needing reliable channel isolation
• Test and measurement instruments utilizing multi-channel power distribution

Procurement Notes

Verify the specific suffix IF against official Skyworks documentation to confirm pinout and thermal pad configurations. Ensure compatibility with the intended isolation voltage requirements and control logic levels. Check for moisture sensitivity handling procedures due to the DFN-32 packaging type. Confirm that the 9V to 32V load voltage range aligns with the target application's power supply specifications before finalizing procurement orders.

Selection Notes

Select this component when four isolated channels are required for power distribution in space-constrained designs. The DFN-32 package offers a compact footprint suitable for dense PCB layouts. Consider the 155 mOhm on-resistance for efficiency calculations in low-voltage applications. The wide operating temperature range makes it suitable for harsh industrial or automotive environments where thermal stability is critical for long-term reliability.

Part Context

The Si83408AFA-IF belongs to the Si834xx series of isolated smart switches from Skyworks Solutions. This family focuses on providing integrated power switching solutions with digital control interfaces. The series is designed to replace discrete MOSFET arrangements, simplifying circuit design and reducing board space. It complements other Skyworks isolation products by offering robust channel separation and protection features.

FAQ

What is the maximum load voltage supported by the Si83408AFA-IF?

The device supports a load voltage range from 9 V to 32 V.

Does the Si83408AFA-IF include both high-side and low-side switches?

Yes, the IC integrates both high-side and low-side switch types within its four channels.

What is the typical current limit setting for each channel?

Each channel has a specified current limit of 880 mA.