RD43FF
0.1
100
80
9
8
7
6
5
4
I2t = Î2 x t
2
Anode side cooled
60
40
Double side cooled
0.01
Effective thermal resistance
Junction to case ˚C/W
Conduction
Double side Anode side
20
0
0.022
0.024
0.026
0.027
0.038
0.040
0.042
0.043
d.c.
Halfwave
3 phase 120˚
6 phase 60˚
I2t
0.001
0.001
0.01
0.1
1.0
10
1
10
1
2 3 5 10 20 50
Time - (s)
ms
Cycles at 50Hz
Duration
Fig. 5 Surge (non-repetitive) forward current vs time
(with 50% VRRM @ Tcase = 175˚C)
Fig. 6 Maximum (limit) transient thermal impedance
5/7
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