View irf740as datasheet:

PD- 92005 SMPS MOSFET IRF740AS/L HEXFET® Power MOSFET Applications VDSS Rds(on) max ID Switch Mode Power Supply ( SMPS ) Uninterruptable Power Supply 400V 0.55? 10A 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 D 2 TO-262 Pak Avalanche Voltage and Current Effective Coss specified ( See AN 1001) Absolute Maximum Ratings Parameter Max. Units ID @ TC = 25°C Continuous Drain Current, VGS @ 10V 10 ID @ TC = 100°C Continuous Drain Current, VGS @ 10V 6.3 A IDM Pulsed Drain Current 40 PD @TA = 25°C Power Dissipation 3.1 W PD @TC = 25°C Power Dissipation 125 Linear Derating Factor 1.0 W/°C VGS Gate-to-Source Voltage ± 30 V dv/dt