Page 1
Tj
Forward current =
ANSALDO
Ansaldo Trasporti s.p.a.
Unita' Semiconduttori
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
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 -
Symbol Characteristic Conditions
[°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=55°C, double side cooled 1690 A
I F (AV) Mean forward current 180° square,50 Hz,Th=55°C,double side cooled 1735 A
I FSM Surge forward current Sine wave, 10 ms 150 27 kA
I² t I² t
V FM Forward voltage
V F(TO) Threshold voltage 150 1.30 V
r F Forward slope resistance 150 0.650 mohm
reapplied reverse voltage up to 50% VRSM
2880 x1E3 A²s
2000 A 25 2.40 V
SWITCHING
t rr Reverse recovery time I F = 1000 A 4.2 µs
Q rr Reverse recovery charge
I rr Peak reverse recovery current
s Softness (s-factor), min 0.5
V FR Peak forward recovery di/dt= 400 A/µs 150 40 V
di/dt= 250 A/µs
VR = 50 V
150 1350 µC
650 A
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
Page 2
ARF678 FAST RECOVERY DIODE
Power Dissipation [W]
ANSALDO
Power Dissipation [W]
FINAL SPECIFICATION apr 97 - ISSUE : 01
DISSIPATION CHARACTERISTICS
7000
SQUARE WAVE
DC
6000
90°
120°
180°
5000
60°
4000
30°
3000
2000
1000
0
0 500 1000 1500 2000 2500
Mean Forward Current [A]
SINE WAVE
7000
180°
6000
5000
60°
30°
90°
120°
4000
3000
2000
1000
0
0 500 1000 1500 2000 2500
Mean Forward Current [A]
Page 3
ARF678 FAST RECOVERY DIODE
ANSALDO
Qrr [µC]
Irr [A]
500 A
VFR [V]
I
FINAL SPECIFICATION apr 97 - ISSUE : 01
SWITCHING CHARACTERISTICS
FORWARD RECOVERY VOLTAGE
80
70
60
50
40
30
20
10
0
0 200 400 600 800 1000 1200
REVERSE RECOVERY CHARGE
1600
1400
1200
1000
800
600
400
200
0
0 100 200 300 400
Tj = 150 °C
Tj = 25 °C
di/dt [A/µs]
Tj=150°C
1000 A
500 A
250 A
di/dt [A/µs]
F
VFR
VF
REVERSE RECOVERY CURRENT
Tj=150°C
800
750
700
650
600
550
500
450
400
350
300
250
200
150
100
50
0
0 100 200 300 400
di/dt [A/µs]
1000 A
250 A
ta = Irr / (di/dt) tb = trr - ta
Softness (s factor) s = tb / ta
Energy dissipation during recovery Er = Vr · (Qrr - Irr ·ta / 2 )
IF
d i/d t
ta
tb
Irr
Vr
Page 4
ARF678 FAST RECOVERY DIODE
FORWARD CHARACTERISTIC
Forward Current [A]
Zth j-h [°C/kW]
SURGE CHARACTERISTIC
ITSM [kA]
ANSALDO
FINAL SPECIFICATION apr 97 - ISSUE : 01
Tj = 150 °C
6000
5000
4000
3000
2000
1000
0
0.6 1.6 2.6 3.6 4.6 5.6
Forward Voltage [V]
TRANSIENT THERMAL IMPEDANCE
DOUBLE SIDE COOLED
Tj = 150 °C
30
25
20
15
10
5
0
1 10 100
n° cycles
14.0
12.0
10.0
8.0
6.0
4.0
2.0
0.0
0.001 0.01 0.1 1 10 100
t[s]
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 µm.
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.
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