GM1117S
1A LOW DROPOUT
PRECISION VOLTAGE REGULATOR
As a design aid, the table below shows the value of the ΘJA of SOT-223 and TO-252 for different
heat sink area.
Copper Area
Thermal Resistance
Layout
* Top Side (in2)
Bottom Side (in2)
(ΘJA, °C/W) SOT-223
(ΘJA, °C/W) TO-252
1
2
0.0123
0.066
0.3
0
0
136
123
84
103
87
60
54
52
47
84
70
63
57
57
89
72
61
55
53
3
0
4
0.53
0.76
1
0
75
5
0
69
6
0
66
7
0
0.2
0.4
0.6
0.8
1
115
98
8
0
9
0
89
10
11
12
13
14
15
16
0
82
0
79
0.066
0.175
0.284
0.392
0.5
0.066
0.175
0.284
0.392
0.5
125
93
83
75
70
* Tab of device attached to top side copper.
12