LB-20 Datasheet, PDF (1/1 Pages) List of Unclassifed Manufacturers – Effect of PWB Copper Area on Thermal Performance of 20-Lead SOIC LB Package

Effect of PWB Copper Area on Thermal Performance
of 20−Lead SOIC LB Package
Thermal Resistance (R_θJA) vs. Copper Area on PWB
100
90
One side Copper
Two side Copper
80
70
60
50
40
0
1
2
3
4
Area of Copper on Board (in²)
Variable Copper Area Test Board
Red-hatched area is copper on the surface of the PWB
Copper Area Must Be Connected to
Package Ground Leads
The 20 lead LB package has 4 ground
leads as shown. Additional copper
area must be connected to these
leads.
16 15
56
Using a Double-Layer PWB
For the double-layer copper board, the
copper area on the bottom is identical
to the area on the top. Both the top and
bottom layers are thermally connected
through vias placed on each ground
lead.