Owner's Manual

IRF840
www.vishay.com
Vishay Siliconix
S21-0883-Rev. E, 30-Aug-2021
5
Document Number: 91070
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ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
Fig. 12a - Unclamped Inductive Test Circuit Fig. 12b - Unclamped Inductive Waveforms
Fig. 12c - Maximum Avalanche Energy vs. Drain Current
Fig. 13a - Basic Gate Charge Waveform Fig. 13b - Gate Charge Test Circuit
R
G
I
AS
0.01 Ω
t
p
D.U.T.
L
V
DS
+
-
V
DD
10 V
Vary t
p
to obtain
required I
AS
I
AS
V
DS
V
DD
V
DS
t
p
91070_12c
Bottom
To p
I
D
3.6 A
5.1 A
8.0 A
V
DD
= 50 V
1200
0
200
400
600
800
1000
25 150
125
10075
50
Starting T
J
, Junction Temperature (°C)
E
AS
, Single Pulse Energy (mJ)
Q
GS
Q
GD
Q
G
V
G
Charge
10 V
D.U.T.
3 mA
V
GS
V
DS
I
G
I
D
0.3 µF
0.2 µF
50 kΩ
12 V
Current regulator
Current sampling resistors
Same type as D.U.T.
+
-