620 V, 5.5 A N-channel in TO-220FP
The STF6N62K3 is an N-channel MOSFET from STMicroelectronics' SuperMESH3™ series, rated for 620 V drain-to-source voltage and 5.5 A continuous drain current at 25°C case temperature. The 1.28 Ohm maximum on-resistance at 2.8 A and 10 V gate drive sets the conduction loss floor — at full rated current the dissipation in the channel alone is roughly 39 W, which exceeds the 30 W package limit, so real-world operation derates the current or requires a heatsink that keeps the junction below 150°C. The through-hole TO-220FP full-pack package isolates the metal tab from the drain, so the device can be bolted directly to a chassis or heatsink without an insulating pad — a time-saver on the assembly line and one less thermal interface to model. The 30 W maximum power dissipation at case temperature is the thermal budget to work with; a 50°C ambient with a 1°C/W heatsink leaves about 70°C junction rise, which is comfortable for continuous 2 A loads.
Gate drive and switching profile
Gate charge is 34 nC at 10 V gate drive — a manageable figure for a discrete driver or a PWM controller's totem-pole output. At a 50 kHz switching frequency the average gate-drive current is 1.7 mA, well within the capability of most gate-drive ICs. The 875 pF input capacitance at 50 V drain bias means the driver sees a capacitive load that rises with the Miller plateau; the total switching loss depends on how fast the driver can push that 34 nC in and out. The 4.5 V gate threshold at 50 µA drain current is a typical SuperMESH3 figure — the device is fully enhanced at 10 V drive (the specified Rds(on) condition) but will start conducting well below that. For logic-level drive at 5 V the on-resistance will be higher than the 1.28 Ohm datasheet value, so factor that into the conduction loss calculation if the gate drive rail is not 10 V.
Lifecycle and compliance
The base product number is STF6, covering the TO-220FP family in this voltage and current class. The part is supplied in Tube packaging — 50 pieces per tube typical for TO-220, though the exact quantity per tube should be confirmed with the distributor at order time.