For BOM lines that still require this exact order code, procurement must turn to the independent distribution channel.
The 650 V drain-source rating places it squarely in the 600 V–650 V class used for power-factor-correction stages, flyback converters, and auxiliary switched-mode power supplies in industrial and consumer equipment.
The gate is driven with 10 V for the rated Rds(on) minimum; the absolute maximum gate-source voltage is ±25 V. Total gate charge is 22 nC at 10 V, which is moderate for this voltage/current class — a typical gate driver with 1 A peak source/sink can switch the device in the 50–100 ns range, though the actual switching speed depends on the driver's output resistance and the external gate resistor. Input capacitance is 816 pF at 100 V drain-source, a value that helps keep the Miller plateau manageable for designs that need to balance switching losses against EMI.
The STFI15N65M5 comes in a TO-262-3 Full Pack (I²Pak) through-hole package, also designated I2PAKFP (TO-281). The full-pack (isolated tab) variant means the metal backside tab is electrically isolated from the drain, simplifying heatsink attachment — no insulating pad is required, though thermal grease is still recommended. The junction-to-case thermal path must handle up to 30 W power dissipation at the case temperature rating. The 150°C maximum junction temperature allows a reasonable derating window: for a 105°C ambient, the allowable temperature rise is 45°C, which at 30 W gives a required thermal resistance of 1.5°C/W or better from case to ambient — achievable with a modest heatsink and forced airflow.