DF451
1/8
FEATURES
s
Double Side Cooling
s
High Surge Capability
s
Low Recovery Charge
Applications
s
Induction Heating
s
A.C. Motor Drives
s
Inverters And Choppers
s
Welding
s
High Frequency Rectification
s
UPS
Voltage Ratings
KEY PARAMETERS
V
RRM
1600V
I
F(AV)
295A
I
FSM
3500A
Q
r
25
C
t
rr
1.22
s
CURRENT RATINGS
Symbol
Parameter
Conditions
Double Side Cooled
I
F(AV)
Mean forward current
I
F(RMS)
RMS value
I
F
Continuous (direct) forward current
Single Side Cooled (Anode side)
I
F(AV)
Mean forward current
I
F(RMS)
RMS value
I
F
Continuous (direct) forward current
Units
Max.
Half wave resistive load, T
case
= 65
o
C
295
A
T
case
= 65
o
C
543
A
T
case
= 65
o
C
391
A
Half wave resistive load, T
case
= 65
o
C
220
A
T
case
= 65
o
C
348
A
T
case
= 65
o
C
285
A
1600
1400
1200
1000
800
600
DF451 16
DF451 14
DF451 12
DF451 10
DF451 08
DF451 06
Conditions
V
RSM
= V
RRM
+ 100V
Type Number
Repetitive Peak
Reverse Voltage
V
RRM
V
Outline type code: M771.
See Package Details for further information.
DF451
Fast Recovery Diode
Replaces March 1999 version, DS4142-4.0
DS4143-5.0 January 2000
DF451
2/8
SURGE RATINGS
Conditions
Max.
Units
3.5
kA
61.25 x 10
3
A
2
s
I
2
t for fusing
I
2
t
Surge (non-repetitive) forward current
I
FSM
Parameter
Symbol
10ms half sine; with 0% V
RRM,
T
j
= 150
o
C
2.8
kA
39.2 x 10
3
A
2
s
I
2
t for fusing
I
2
t
Surge (non-repetitive) forward current
I
FSM
10ms half sine; with 50% V
RRM,
T
j
= 150
o
C
THERMAL AND MECHANICAL DATA
dc
Conditions
Max.
Units
o
C/W
-
0.133
Anode dc
Clamping force 5.0kN
with mounting compound
Thermal resistance - case to heatsink
R
th(c-h)
0.02
Double side
-
Single side
Thermal resistance - junction to case
R
th(j-c)
Single side cooled
Symbol
Parameter
-
0.02
o
C/W
o
C/W
Cathode dc
-
0.147
o
C/W
Double side cooled
-
0.07
o
C/W
T
stg
Storage temperature range
55
150
o
C
kN
5.5
4.5
Clamping force
-
T
vj
Virtual junction temperature
Forward (conducting)
-
150
o
C
-
t
rr
100
Symbol
Typ.
Units
Parameter
V
FM
Forward voltage
I
RRM
Peak reverse current
Reverse recovery time
Q
RA1
Recovered charge (50% chord)
I
RM
Reverse recovery current
K
Soft factor
V
TO
Threshold voltage
r
T
Slope resistance
V
FRM
Forward recovery voltage
di/dt = 1000A/
s, T
j
= 125
o
C
-
40
V
At T
vj
= 125
o
C
-
1.5
m
At T
vj
= 125
o
C
-
1.6
V
1.7
-
-
-
40
A
-
25
C
1.22
-
s
At V
RRM
, T
case
= 125
o
C
-
mA
At 600A peak, T
case
= 25
o
C
-
2.65
V
Conditions
Max.
I
F
= 500A, di
RR
/dt = -80A/
s
T
case
= 125
o
C, V
R
= 100V
CHARACTERISTICS
DF451
3/8
CURVES
Fig.1 Maximum (limit) forward characteristics
500
1000
1500
2000
2500
3000
Instantaneous forward current, I
F
- (A)
2.0
3.0
4.0
5.0
6.0
Instantaneous forward voltage, V
F
- (V)
Measured under pulse conditions
T
j
= 150C
T
j
= 25C
DEFINITION OF K FACTOR AND Q
RA1
0.5x I
RR
I
RR
dI
R
/dt
t
1
t
2
Q
RA1
= 0.5x I
RR
(t
1
+ t
2
)
k = t
1
/t
2
DF451
4/8
Fig.2 Maximum (limit) forward characteristics
0
100
200
300
400
500
Instantaneous forward current, I
F
- (A)
1.25
1.5
1.75
2.0
2.25
Instantaneous forward voltage, V
F
- (V)
Measured under pulse conditions
T
j
= 150C
T
j
= 25C
DF451
5/8
Fig.3 Recovered charge
Fig.4 Typical reverse recovery current vs rate of rise of forward current
1
10
100
1000
Rate of rise of reverse current, dI
R
/dt - (A/
s)
10
1
100
1000
Reverse recovered charge Q
S
- (
C)
I
RR
Q
S
t
p
= 1ms
I
F
dI
R
/dt
Q
S
=
Conditions:
T
j
= 125C,
V
R
= 100V
50
s
0
I
F
= 2000A
I
F
= 1000A
I
F
= 500A
I
F
= 200A
I
F
= 100A
1
10
100
1000
Rate of rise of reverse current, dI
R
/dt - (A/
s)
10
1
100
1000
Reverse recovery current, I
RR
- (A)
Conditions:
T
j
= 125C,
V
R
= 100V
I
F
= 2000A
I
F
= 1000A
I
F
= 500A
IF = 100A
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