RD33FG
80
I
2
t = Î
2
x t
70
Peak half sine forward current - (kA)
8
7
6
I
2
t value - (A
2
s x 10
6
)
Thermal Impedance - Junction to case (˚C/W)
0.1
Anode side cooled
2
60
50
40
30
20
Double side cooled
5
4
3
2
0.01
I
2
t
10
1
ms
10
1
2 3 5
10 20
Cycles at 50Hz
Duration
1
50
0.001
0.001
Conduction Effective thermal resistance
Junction to case ˚C/W
Double side Anode side
0.032
0.064
d.c.
0.034
0.066
Halfwave
0.044
0.076
3 phase 120˚
0.057
0.089
6 phase 60˚
0.01
0.1
Time - (s)
1.0
10
Fig. 5 Surge (non-repetitive) forward current vs time
(with 50% V
RRM
@ T
case
= 175˚C)
Fig. 6 Maximum (limit) transient thermal impedance
5/7
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