Fast recovery diode in a TO-220AC through-hole package
The BYC10D-600,127 from WeEn Semiconductors is a standard fast recovery diode rated for 500 V DC reverse voltage and 10 A average rectified current, housed in a TO-220AC through-hole package. Its 18 ns reverse recovery time (trr) places it firmly in the fast recovery class, suited for high-frequency switching in power supplies, motor drives, and snubber circuits where switching losses matter.
The 18 ns trr is the time to sweep stored charge from the junction when the diode transitions from forward conduction to reverse blocking. In a 50–100 kHz PFC boost or flyback converter, that recovery charge (Qrr) is the dominant contributor to turn-off loss in the diode and switching noise in the loop. At 10 A forward current, the maximum forward voltage is 2.5 V, so conduction loss at full load is 25 W — the TO-220AC package with a proper heatsink can handle that thermal budget in a forced-air or well-ventilated enclosure.