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   MBRM120ET1G, NRVBM120ET1G, MBRM120ET3G, NRVBM120ET3G http://onsemi.com 4 T J , DERATED OPERATING TEMPERATURE ( C) C, CAPACITANCE (pF) Figure 7. Capacitance Figure 8. Typical Operating Temperature Derating* 2.0 4.0 8.0 10 8.0 1012 14 16 18 12 1420 2.0 4.0 0 VR, REVERSE VOLTAGE (VOLTS) 1000 100 10 VR, DC REVERSE VOLTAGE (VOLTS) 6.0 2016 18 0 146 144 6.0 148 150 * 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 = 33.72 ?C/W 51?C/W 83.53?C/W 96?C/W TJ = 25 ?C 69?C/W |