is the sum of the junction-to-case and case-to-ambient thermal resistance where the case thermal reference is defined as the solder mounting surface of the drain pins. R
θ
JC
is guaranteed by
design while R
θ
CA
is determined by the user's board design.
1.3
V
GS
= 0 V, I
S
= 1.3 A
(Note 2)
0.75
1.2
A
V
P
D
(
t
) =
R
θ
J A
t
)
(
T
J
−
T
A
=
R
θ
J C
R
θ
CA
t
)
+
(
T
J
−
T
A
=
I
2
(
t
) ×
R
DS
(
ON
)
D
T
J
Typical R
θ
JA
using the board layouts shown below on 4.5"x5" FR-4 PCB in a still air environment:
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stm32/stm8
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