FAST RECOVERY DIODE
ARF678
Repetitive voltage up to
4500
V
Mean forward current
1690
A
Surge current
27
kA
FINAL SPECIFICATION
apr 97 - ISSUE : 01
Symbol
Characteristic
Conditions
Tj
[C]
Value
Unit
BLOCKING
V
RRM
Repetitive peak reverse voltage
150
4500
V
V
RSM
Non-repetitive peak reverse voltage
150
4600
V
I
RRM
Repetitive peak reverse current
V=VRRM
150
150
mA
CONDUCTING
I
F (AV)
Mean forward current
180 sin ,50 Hz, Th=55C, double side cooled
1690
A
I
F (AV)
Mean forward current
180 square,50 Hz,Th=55C,double side cooled
1735
A
I
FSM
Surge forward current
Sine wave, 10 ms
150
27
kA
I t
I t
reapplied reverse voltage up to 50% VRSM
2880 x1E3
As
V
FM
Forward voltage
Forward current =2000 A
25
2.40
V
V
F(TO)
Threshold voltage
150
1.30
V
r
F
Forward slope resistance
150
0.650
mohm
SWITCHING
t rr
Reverse recovery time
I F = 1000 A
4.2
s
Q rr
Reverse recovery charge
di/dt=
250 A/s
150
1350
C
I rr
Peak reverse recovery current
VR =
50 V
650
A
s
Softness (s-factor), min
0.5
V
FR
Peak forward recovery
di/dt=
400 A/s
150
40
V
MOUNTING
R
th(j-h)
Thermal impedance
Junction to heatsink, double side cooled
14.0
C/kW
T
j
Operating junction temperature
-30 / 150
C
F
Mounting force
35.0 / 40.0
kN
Mass
850
g
ORDERING INFORMATION : ARF678 S 45
standard specification
VRRM/100
Via N. Lorenzi 8 - I 16152 GENOVA - ITALY
Tel. int. +39/(0)10 6556549 - (0)10 6556488
Fax Int. +39/(0)10 6442510
Tx 270318 ANSUSE I -
ANSALDO
Ansaldo Trasporti s.p.a.
Unita' Semiconduttori
ARF678 FAST RECOVERY DIODE
FINAL SPECIFICATION apr 97 - ISSUE : 01
DISSIPATION CHARACTERISTICS
SQUARE WAVE
SINE WAVE
DC
180
0
1000
2000
3000
4000
5000
6000
7000
0
500
1000
1500
2000
2500
Mean Forward Current [A]
Power Dissipation [
W
]
60
90
30
120
ANSALDO
0
1000
2000
3000
4000
5000
6000
7000
0
500
1000
1500
2000
2500
Mean Forward Current [A]
Power Dissipation [
W
]
180
120
90
60
30
ARF678 FAST RECOVERY DIODE
FINAL SPECIFICATION apr 97 - ISSUE : 01
SWITCHING CHARACTERISTICS
ANSALDO
REVERSE RECOVERY CHARGE
Tj=150C
0
200
400
600
800
1000
1200
1400
1600
0
100
200
300
400
di/dt [A/s]
Qrr [C]
250 A
500 A
1000 A
REVERSE RECOVERY CURRENT
Tj=150C
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
750
800
0
100
200
300
400
di/dt [A/s]
Irr [A]
250 A
500 A
1000 A
FORWARD RECOVERY VOLTAGE
0
10
20
30
40
50
60
70
80
0
200
400
600
800
1000
1200
di/dt [A/s]
VFR [V]
Tj = 150 C
Tj = 25 C
I
F
V
FR
V
F
ta
ta = Irr / (di/dt) tb = trr - ta
Softness (s factor) s = tb / ta
Energy dissipation during recovery Er = Vr (Qrr - Irr ta / 2 )
Irr
Vr
tb
I
F
d i/d t
ARF678 FAST RECOVERY DIODE
FINAL SPECIFICATION apr 97 - ISSUE : 01
Distributed by
FORWARD CHARACTERISTIC
Tj = 150 C
0
1000
2000
3000
4000
5000
6000
0.6
1.6
2.6
3.6
4.6
5.6
Forward Voltage [V]
Forward Current [A]
TRANSIENT THERMAL IMPEDANCE
DOUBLE SIDE COOLED
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
0.001
0.01
0.1
1
10
100
t[s]
Zth j-h [C/kW]
SURGE CHARACTERISTIC
Tj = 150 C
0
5
10
15
20
25
30
1
10
100
n cycles
ITSM [kA]
All the characteristics given in this data sheet are guaranteed only with uniform
clamping force, cleaned and lubricated heatsink, surfaces with flatness < .03 mm
and roughness < 2 m.
In the interest of product improvement ANSALDO reserves the right to change
any data given in this data sheet at any time without previous notice.
If not stated otherwise the maximum value of ratings (simbols over shaded
background) and characteristics is reported.
ANSALDO
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