BUY IXTM21N50 https://www.utsource.net/itm/p/999733.html
MegaMOSFET
Description: MOSFET Transistor, N-Channel, 500V, 21A, TO-3 Features: Low on-resistance Low gate charge Low gate-source capacitance Low input capacitance Low output capacitance High frequency operation High avalanche energy High current capability High voltage capability High power dissipation Applications: Motor control Power switching DC/DC converters Uninterruptible power supplies Lighting control Home appliances Automotive applications (For reference only)