SNVS774L – MAY 2004 – REVISED FEBRUARY 2011
LM317A and LM317-N Electrical Characteristics
(continued)
Specifications with standard type face are for T
J
= 25°C, and those with
boldface type
apply over
full Operating
Temperature Range.
Unless otherwise specified, V
IN
−
V
OUT
= 5V, and I
OUT
= 10 mA.
Parameter
Conditions
NDS (TO-3) Package
NDE (TO-220) Package
Thermal Resistance,
θ
JC
Junction-to-Case
KTT (TO-263) Package
DCY (SOT-223) Package
NDT (TO) Package
MDT (PFM) Package
NDS (TO-3) Package
NDE (TO-220) Package
Thermal Resistance,
θ
JA
Junction-to-Ambient (No
Heat Sink)
KTT (TO-263) Package
NDT (TO) Package
MDT (PFM) Package
(3)
(3)
(3)
(3)
LM317A
Min
Typ
-
4
-
23.5
21
12
-
50
-
140
186
103
Max
Min
LM317-N
Typ
2
4
4
23.5
21
12
39
50
50
140
186
103
°C/W
°C/W
Max
Units
DCY (SOT-223) Package
When surface mount packages are used (TO-263, SOT-223, PFM), the junction to ambient thermal resistance can be reduced by
increasing the PC board copper area that is thermally connected to the package. See the Applications Hints section for heatsink
techniques.
6
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