FFA20U40DNTU

Diode Arrays Overview

The FFA20U40DN is an ultrafast recovery power rectifier manufactured by Fairchild Semiconductor, now part of onsemi. It features a dual common cathode configuration housed in a TO-3PN package. Key electrical parameters include a peak repetitive reverse voltage (VRRM) of 400 V and an average rectified forward current (IF(AV)) of 20 A at a case temperature of 100°C. The device exhibits a maximum instantaneous forward voltage of 1.4 V at 25°C and 1.3 V at 100°C when conducting 20 A. Reverse recovery time is specified at a maximum of 50 ns under conditions of IF=20A and di/dt=200A/µs. Maximum thermal resistance from junction to case is 2.0 °C/W.

Diode Arrays Feature Summary

• Ultrafast recovery characteristics with soft recovery behavior
• Low forward voltage drop for efficient conduction
• RoHS compliant construction

Diode Arrays Applications

• Power switching circuits
• Output rectifiers
• Freewheeling diodes
• Switching mode power supplies

Diode Arrays Procurement Notes

Verify the specific manufacturer origin, as the component was originally produced by Fairchild Semiconductor before its acquisition by onsemi. Confirm that the TO-3PN package dimensions and pinout match the design requirements. Ensure compliance with RoHS standards if required by the final assembly specifications. Check for any obsolescence notices or lifecycle status updates regarding this specific revision.

Diode Arrays Selection Notes

Select this component for applications requiring high-speed switching with low conduction losses. The 400 V rating suits medium-voltage AC-DC conversion systems. Consider the 20 A current capability and thermal management needs given the 2.0 °C/W junction-to-case resistance. The soft recovery feature helps minimize electromagnetic interference in sensitive switching environments compared to hard-recovery alternatives.

Diode Arrays Part Context

This rectifier belongs to the ultrafast recovery power diode category designed for high-frequency operation. It serves as a critical component in power electronics where rapid turn-off times are essential to reduce switching losses. The TO-3PN package provides robust mechanical stability and efficient heat dissipation capabilities suitable for industrial and commercial power supply designs.

Diode Arrays Replacement Considerations

Check for direct equivalents such as the FFA20U60DNTU for higher voltage ratings or similar packages from other manufacturers like STMicroelectronics or Vishay. Verify that substitute parts maintain compatible reverse recovery times and forward voltage characteristics to ensure circuit performance remains within design limits.

Diode Arrays FAQ

What is the maximum non-repetitive peak surge current?

The maximum non-repetitive peak surge current is 200 A for a 60 Hz single half-sine wave.

Does the device support avalanche energy handling?

Yes, the datasheet specifies an avalanche energy (AVL) rating of 1.0 mJ.

What is the typical junction capacitance?

The typical junction capacitance is 930 pF at 0 V reverse bias.