STP4NK80Z.
STMicroelectronics
Price range: $1.33 - $2.40
N CHANNEL MOSFET 800V 3A TO-220; Transistor Polarity:N Channel; Continuous Drain Current Id:3A; Drain Source Voltage Vds:800V; On Resistance Rds(on):3ohm; Rds(on) Test Voltage Vgs:10V; Threshold Voltage Vgs:3.75V; No. of Pins:3