MC33275, NCV33275
180
160
140
120
100
80
1.6
1.4
1.2
1.0
0.8
0.6
0.4
P
for T = 50°C
D(max)
A
2.0 oz. Copper
L
Minimum
Size Pad
L
R
ꢁ
JA
60
0
5.0
10
15
20
25
30
L, LENGTH OF COPPER (mm)
Figure 17. SOT−223 Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
1.6
1.4
1.2
1.0
0.8
0.6
0.4
100
90
P
for T = 50°C
A
D(max)
2.0 oz. Copper
80
70
60
50
L
Minimum
Size Pad
L
R
ꢁ
JA
40
0
5.0
10
15
20
25
30
L, LENGTH OF COPPER (mm)
Figure 18. DPAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
170
150
130
110
90
3.2
2.8
2.4
2.0
1.6
1.2
P
for T = 50°C
A
D(max)
Graph Represents Symmetrical Layout
2.0 oz.
L
Copper
70
3.0
L
R
ꢁ
JA
mm
50
30
0.8
0.4
0
10
20
30
40
50
L, LENGTH OF COPPER (mm)
Figure 19. SOP−8 Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
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