View irfbc40as datasheet:

PD- 91897A SMPS MOSFET IRFBC40AS HEXFET® Power MOSFET Applications VDSS Rds(on) max ID Switch Mode Power Supply ( SMPS ) Uninterruptable Power Supply 600V 1.2? 6.2A High speed power switching Benefits Low Gate Charge Qg results in Simple Drive Requirement Improved Gate, Avalanche and dynamic dv/dt Ruggedness Fully Characterized Capacitance and Avalanche Voltage and Current D 2 Pak Effective Coss Specified ( See AN 1001) Absolute Maximum Ratings Parameter Max. Units ID @ TC = 25°C Continuous Drain Current, VGS @ 10V 6.2 ID @ TC = 100°C Continuous Drain Current, VGS @ 10V 3.9 A IDM Pulsed Drain Current 25 PD @TC = 25°C Power Dissipation 125 W Linear Derating Factor 1.0 W/°C VGS Gate-to-Source Voltage ± 30 V dv/dt Peak Diode Recovery dv/dt 6.0 V/ns TJ Operati