Thermal Data ® DIP 24 24 leads PACKAGE MATERIAL LIST item # material thickness thermal conductivity leadframe copper 0.25 mm 2.61 W/cm°C die attach epoxy glue ( silver filler ) 10-40 µm 0.01 W/cm°C molding compound epoxy resin 3 mm 0.0063W/cm°C Charts enclosed : 1) Rth(j-a) vs power dissipation 2) Zth(j-a) vs time width and die size February 1998 1/2 Thermal Data DIP 24 Rth(j-a) (ºC/W) 85 1) copper frame thickness = 0.25 mm die pad = 150 x 280 sq.mils 80 die size = 10.000 sq.mils 75 70 floating in air 65 60 mounted on board 55 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 dissipated power ( Watt ) 2 2.2 2.4 2.6 2.8 3 Transient Thermal Resistance (ºC/W) 100 50 copper frame thickness = 0.25 mm die pad = 110 x 280 sq.mils 30 20 2) 10 on die dissipating area = 2000 sq.mils mounted on board pd = 2 Watt 5 3 2 1 0.001 2/2 0.01 0.1 1 10 Time or pulse width ( s ) 100 1,000