FMX-4203S

Diode Arrays Overview

The FMX-4203S is a fast recovery diode manufactured by Sanken Electric. It features a maximum repetitive peak reverse voltage of 300 V and an average forward current rating of 20 A. The device achieves a maximum reverse recovery time of 30 ns through optimized lifetime control. Key electrical characteristics include a typical forward voltage drop of 0.97 V at 10 A and a junction-to-case thermal resistance of 2.0 °C/W. It operates within a junction temperature range of -40 to 150 °C.

Diode Arrays Feature Summary

• Optimized lifetime control for high-speed switching performance
• Low thermal resistance package design for efficient heat dissipation
• Lead-free construction compliant with RoHS standards

Diode Arrays Applications

• Secondary-side rectifier diodes in flyback converters
• Secondary-side rectifier diodes in LLC converters
• Freewheel diodes in offline buck converters
• Freewheel diodes in offline buck-boost converters

Diode Arrays Procurement Notes

Verify the specific revision number (e.g., Rev.1.2) against the manufacturer's official datasheet before procurement, as specifications are subject to change without notice. Confirm that the bare lead frame meets Pb-free requirements for your assembly process. Ensure heatsink mounting torque remains within the specified 0.686 to 0.882 N·m range during installation.

Diode Arrays Selection Notes

Select this component for applications requiring a 300 V blocking capability and 20 A continuous current handling. The 30 ns reverse recovery time makes it suitable for high-frequency switching topologies. Consider the TO3PF-3L package dimensions and screw-mounting requirements when designing the PCB layout and thermal management system.

Diode Arrays Part Context

This component belongs to Sanken Electric's fast recovery diode series designed for power conversion circuits. It utilizes a three-terminal TO3PF-3L package configuration with two anode terminals and one cathode terminal. The device is intended for general-purpose electronic equipment such as home appliances and telecommunications devices.

Diode Arrays Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.

Diode Arrays FAQ

What is the maximum nonrepetitive peak reverse voltage?

The maximum nonrepetitive peak reverse voltage (VRSM) is 300 V.

How is the thermal resistance defined for this device?

The junction-to-case thermal resistance (Rth(J-C)) is 2.0 °C/W, measured at the back side near the screw hole.

What are the conditions for measuring the maximum reverse recovery time?

The maximum trr of 30 ns is measured at IF = IRP = 500 mA with a 90% recovery point at TJ = 25 °C.