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     MBRS2040LT3G, NRVBS2040LT3G http://onsemi.com 4 Figure 7. Capacitance Figure 8. Typical Operating Temperature Derating* Figure 9. Thermal Response Junction to Lead Figure 10. Thermal Response Junction to Ambient 5.0 10 20 25 35 40 30 3530 5.0 10 2015 0 VR, REVERSE VOLTAGE (VOLTS) 1000 100 10 VR, DC REVERSE VOLTAGE (VOLTS) 25 40 65 0 105 85 75 100 0.0001 0.001 0.01 1.0 100.1 0.00001 T, TIME (s) 1.0 0.1 0.01 C, CAPACITANCE (pF) T R 15 95 115 125 , DERATED OPERATING TEMPERATURE ( C) J ? 0.001 , TRANSIENT THERMAL RESISTANCE (NORMALIZED) (T) T, TIME (s) 1.0 0.1 0.01 R 0.001 , TRANSIENT THERMAL RESISTANCE (NORMALIZED) (T) * Reverse power dissipation and the possibility of thermal runaway must be considered when operating this device under any re- verse voltage conditions. Calculations of TJ therefore must include forward and reverse power effects. The allowable operating TJ may be calculated from the equation: T J = T Jmax ? r(t)(Pf + Pr) where r(t) = thermal impedance under given conditions, Pf = forward power dissipation, and Pr = reverse power dissipation This graph displays the derated allowable TJ due to reverse bias under DC conditions only and is calculated as T J = T Jmax ? r(t)Pr, where r(t) = Rthja. For other power applications further calculations must be performed. Rtja = 22.5 ?C/W 42?C/W 61?C/W 78?C/W 92?C/W Rtjl(t) = Rtjl*r(t) 50% 20% 10% 5.0% 2.0% 1.0% 100 0.0001 0.001 0.01 1.0 100.1 0.00001 1,000 Rtjl(t) = Rtjl*r(t) 50% 20% 10% 5.0% 2.0% 1.0% TJ = 25 ?C |