800 V N-channel in a full-pack through-hole package
The full-pack TO-220-3 (PG-TO220-3-31) isolates the tab electrically, so no insulating pad or washer is needed between the device and the heatsink — a time-saver on the assembly line and one less BOM line for thermal interface material.
Conduction loss and gate drive budget
That 10 V drive level is the recommended operating point for minimum Rds(on); the gate is rated to ±20 V absolute maximum, giving headroom for a 12 V or 15 V gate driver without risk of oxide breakdown. Total gate charge is 10 nC at 10 V — a light enough load that a simple PWM output from a controller IC or a low-current gate driver can switch it at moderate frequencies without excessive drive losses.
Where the 800 V rating fits the bill
An 800 V Vdss rating with 4 A continuous current places this part squarely in offline flyback converters, auxiliary power supplies, and PFC stages where the DC bus sits at 380–400 V and the reflected voltage on the primary MOSFET can exceed 600 V. The 250 pF input capacitance at 500 V drain-source is low enough that the switching losses stay manageable in a quasi-resonant or hard-switched topology at 65–100 kHz. Operating junction temperature spans -55 to 150 °C, covering industrial and outdoor telecom enclosures where ambient heat pushes the junction.