950 V N-channel MOSFET for offline flyback and auxiliary supplies
The STP2N95K5: The 5 Ohm maximum on-resistance at 1 A and 10 V drive gives a conduction loss of about 5 W at 1 A — budget the thermal path for that dissipation through the TO-220 tab to a heatsink.
Input capacitance is 105 pF at 100 V drain bias — a low figure that contributes to fast switching edges and minimal cross-conduction losses in a half-bridge topology.
Temperature range and thermal limits
Maximum power dissipation is 45 W at the case, but the actual safe operating area depends on the heatsink and ambient — the 150°C junction ceiling is the hard limit for thermal design.