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    MBR120ESF, NRVB120ESF http://onsemi.com 4 C, CAPACITANCE (pF) Figure 7. Capacitance 12 0 VR, REVERSE VOLTAGE (VOLTS) 1000 100 10 2.0 4.0 8.0 106.0 TJ = 25 °C 20 18 16 14 Figure 8. Typical Operating Temperature Derating* * 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. T J , DERATED OPERATING TEMPERATURE ( ° C) 2.0 4.0 8.0 10 2012 14 16 18 0 VR, DC REVERSE VOLTAGE (VOLTS) 155 145 6.0 135 137 139 141 143 147 149 151 153 RJA = 25.6 °C/W 400°C/W 324.9°C/W 235°C/W 130°C/W r(t), TRANSIENT THERMAL RESISTANCE Figure 9. Thermal Response 1000 0.0001 0.001 0.01 1 10 1000.1 0.000001 0.00001 t1, TIME (sec) 1000 1 0.1 10 100 P(pk) t1 t2 DUTY CYCLE, D = t1/t2 JA = 321.8 °C/W Test Type > Min Pad < Die Size 38x38 @ 75% mils D = 0.5 SINGLE PULSE 0.2 0.1 0.05 0.01 |