link to page 3 BSS123TYPICAL CHARACTERISTICS (continued) 1 5 100 s Single Pulse RDS(on) Limit RJA = 350°C/W 1 ms 4 TA = 25°C 0.1 10 ms 3 100 ms ransient Power (W) 2 , Drain Current (A) 0.01 I D V 1 s GS = 10 V Single Pulse 10 s 1 RJA = 350°C/W DC P(pk), Peak T TA = 25°C 0.001 0 1 10 100 1000 0.001 0.01 0.1 1 10 100 1000 VDS, Drain−Source Voltage (V)t1, Time (s)Figure 9. Maximum Safe Operating AreaFigure 10. Single Pulse Maximum Power Dissipation 1 D = 0.5 0.2 ransient 0.1 0.1 RJA(t)= r(t) * RJA 0.05 RJA = 350°C/W 0.02 P(pk) 0.01 0.01 t1 Thermal Resistance t2 Single Pulse TJ − TA = P * RJA(t) r(t), Normalized Effective T Duty Cycle, D = t1 / t2 0.001 0.0001 0.001 0.01 0.1 1 10 100 1000 t1, Time (s)Figure 11. Transient Thermal Response Curve Thermal characterization performed using the conditions described in Note 1a. Transient thermal response will change depending on the circuit board design. www.onsemi.com5