FRD Fast Recovery Diodes

A Fast Recovery Diode (FRD) is a PN junction diode that can switch between forward and reverse oper­ation for an extremely short time. In these diodes, which also include ultra fast recovery diodes and fast recovery epitaxial diodes (FRED), there is a time-dependent corre­lation between the drop in forward voltage and reverse voltage. Different types of fast re­covery diodes cover different ranges.

The faster switching between the forward and reverse ranges, which is expressed in the switch-on and switch-off behaviour and is referred to as the reverse delay time, reduces the reverse current and the power loss of the FRD diode. These lower switching losses make PN diodes parti­cularly robust. This is a major reason for their use in switching power supplies as power diodes with up to approx. 1000V and several hundred amperes. A fast recovery diode does not differ exter­nally from a normal semi­con­ductor diode. The markings as well as the pola­rity with anode and cathode are the same for both.

Properties of FRD diodes

• Variants: Fast & Super Fast Recovery Diodes
• 25 - 400 A
• Passivated glass plate (up to 70 A)
• Low forward voltage drop
• High overvoltage capability
• Low leakage current
• Normal and reverse polarity
• Twin Tower Packages (from 100 A)
• Metric and UNF threads available

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