Power Dissipation on FR-5 Board at TL=75ºC (Note 1) Derated Above 75ºC Thermal Resistance, Junction to Ambient (Note 2) Thermal Resistance, Junction to Lead (Note 2) Operating and Storage Junction Temperature Range SYMBOL PD Rth (j-a) Rth (j-L) Tj, Tstg VALUE 500 6.7 340 150 - 55 to +150 UNIT mW .