Fast Recovery Rectifiers
Silicon rectifiers with short reverse-recovery time for high-frequency power converters.
What is it?
Fast Recovery Rectifiers (FRRs) are silicon P-N junction diodes optimised for short reverse-recovery time (Trr), typically 35-100 ns vs ~1000+ ns for general-purpose rectifiers. Used in high-frequency power converters (>50 kHz) where slow reverse recovery would waste energy and cause voltage spikes. Compared to Schottky, FRRs handle higher reverse voltage (200-1000 V) with lower leakage at high T.
When do you need it?
- Flyback converter secondary rectifier above 100 V output.
- Boost converter output rectifier above 150 V.
- PFC (Power Factor Correction) boost diode.
- Snubber diode in inductive switching circuits.
- Any high-frequency rectifier above the practical Schottky voltage range.
How to pick the right one
- IF (Average forward current)
- Sufficient for continuous load current with thermal margin.
- VR (Repetitive Reverse Voltage)
- Choose well above the maximum reverse voltage during converter switching.
- Trr (Reverse Recovery Time)
- Shorter is better. <50 ns for switching >100 kHz; <35 ns for >250 kHz.
- QRR (Reverse Recovery Charge)
- Stored charge swept out during recovery. Lower QRR = less switching loss and lower EMI.
- VF (Forward Voltage)
- Trade-off with Trr, ultra-fast diodes have higher VF. Pick the slowest VF that meets your switching speed.
What Magnias offers
Magnias fast recovery rectifiers cover 1 A to 8 A and 50 V to 1000 V, with Trr from 35 ns to 500 ns: 1 A to 3 A parts in SOD123-FL, SMA (DO-214AC) and SMB (DO-214AA), from the 35 ns ES series to the PRS1xxxFL (up to 500 ns at 800-1000 V), plus the 8 A superfast MUR805-CT to MUR860-CT (50-600 V, 35 / 50 ns) in TO-220AC. AEC-Q101 versions are available for several series (see the -A ordering code in each datasheet).