pation Derate above 25°C Thermal Resistance, Junction to Ambient Max BAV19 / 20 / 21 500 3.33 300 Units mW mW/°C °C/W 2000 Fairchild Semiconductor International BAV19/20/21, Rev. A BAV19 / BAV20 / BAV21 High Voltage General Purpose Diode (continued) Electrical Characteristics Symbol BV TA =.