SM8

SM8 Thermal Resistance and Derating Information Single die on 2.25W Devices Both die on 2.75W Devices Thermal Resistance (˚C/W) D=1(D.C.) Thermal Resistance (˚C/W) 56 50 40 30 20 10 Single device on t1 tp D=0.5 46 40 Both devices on D=1(D.C.) D=t1 tp t1 tp D=0.5 D=t1 tp 30 20 D=0.2 D=0.1 D=0.05 Single Pulse D=0.2 D=0.1 D=0.05 10 Single Pulse 0 100µs 1ms 10ms 100ms 1s 10s 100s 0 100µs 1ms 10ms 100ms 1s 10s 100s Pulse Width (s) j-a=55.6˚ C/W maximum Mounted on an FR4 p.c.b. of 50mm x 50mm connected using 25mm x 0.5mm copper wire 2.25W and 2.75W Derating Pulse Width (s)  j-a=45.6 C/W maximum ˚ Mounted on an FR4 p.c.b. of 50mm x 50mm connected using 25mm x 0.5mm copper wire PD - Power Dissipation (W) 4.0 3.0 2.75W 2.0 2.25W 1.0 0 0 20 40 60 80 100 120 140 160 TA - Ambient Temperature (˚C)