WESTCODE
An
Date:- 21 Dec, 2004
Data Sheet Issue:- 1
IXYS
Company
Rectifier Diode
Types W1856NC400 to W1856NC500
Old Type No: SW40-50CXC815
Absolute Maximum Ratings
VOLTAGE RATINGS
V
RRM
V
RSM
Repetitive peak reverse voltage, (note 1)
Non-repetitive peak reverse voltage, (note 1)
MAXIMUM
LIMITS
4000 - 5000
4100 - 5100
UNITS
V
V
OTHER RATINGS
I
F(AV)M
I
F(AV)M
I
F(AV)M
I
F(RMS)
I
F(d.c.)
I
FSM
I
FSM2
It
It
T
j op
T
stg
2
2
MAXIMUM
LIMITS
1856
1301
814
3399
3026
16
21
1.28×10
2.21×10
6
6
UNITS
A
A
A
A
A
kA
kA
As
As
°C
°C
2
2
Maximum average forward current, T
sink
=55°C, (note 2)
Maximum average forward current. T
sink
=100°C, (note 2)
Maximum average forward current. T
sink
=100°C, (note 3)
Nominal RMS forward current, T
sink
=25°C, (note 2)
D.C. forward current, T
sink
=25°C, (note 4)
Peak non-repetitive surge t
p
=10ms, V
rm
=0.6V
RRM
, (note 5)
Peak non-repetitive surge t
p
=10ms, V
rm
≤10V,
(note 5)
I t capacity for fusing t
p
=10ms, V
rm
=0.6V
RRM
, (note 5)
I t capacity for fusing t
p
=10ms, V
rm
≤10V,
(note 5)
Operating temperature range
Storage temperature range
2
2
-40 to +160
-55 to +160
Notes:-
1)
De-rating factor of 0.13% per °C is applicable for T
j
below 25°C.
2)
Double side cooled, single phase; 50Hz, 180° half-sinewave.
3)
Single side cooled, single phase; 50Hz, 180° half-sinewave.
4)
Double side cooled.
5)
Half-sinewave, 160°C T
j
initial.
Data Sheet. Types W1856NC400 to W1856NC500 Issue 1
Page 1 of 9
December, 2004
WESTCODE
An IXYS Company
Characteristics
Rectifier Diode Types W1856NC400 to W1856NC500
PARAMETER
V
FM
V
T0
r
T
I
RRM
Q
rr
Q
ra
I
rr
t
rr
R
thJK
F
W
t
Maximum peak forward voltage
Threshold voltage
Slope resistance
Peak reverse current
Recovered charge
Recovered charge, 50% Chord
Reverse recovery current
Reverse recovery time
Thermal resistance, junction to heatsink
Mounting force
Weight
Notes; -
1)
Unless otherwise indicated T
j
=160
°
C.
MIN.
-
-
-
-
-
-
-
-
-
-
-
-
19
-
TYP.
-
-
-
-
-
-
6200
3000
165
36
-
-
-
480
MAX. TEST CONDITIONS
(Note 1)
2.02
2.95
0.975
0.348
50
50
-
3200
-
-
0.022
0.044
26
-
Double side cooled
Single side cooled
I
TM
=1000A, t
p
=1000µs, di/dt=10A/µs,
V
r
=50V
Rated V
RRM
Rated V
RRM
, T
j
=25°C
I
FM
=3000A
I
FM
=5550A
UNITS
V
V
mΩ
mA
µC
µC
A
µs
K/W
kN
g
Data Sheet. Types W1856NC400 to W1856NC500 Issue 1
Page 2 of 9
December, 2004
WESTCODE
An IXYS Company
Notes on Ratings and Characteristics
1.0 Voltage Grade Table
Voltage Grade
40
42
44
46
48
50
V
DRM
V
DSM
V
RRM
V
4000
4200
4400
4600
4800
5000
Rectifier Diode Types W1856NC400 to W1856NC500
V
RSM
V
4100
4300
4500
4700
4900
5100
V
D
V
R
DC V
2000
2040
2080
2120
2160
2200
2.0 Extension of Voltage Grades
This report is applicable to other voltage grades when supply has been agreed by Sales/Production.
3.0 De-rating Factor
A blocking voltage de-rating factor of 0.13%/°C is applicable to this device for T
j
below 25°C.
4.0 Snubber Components
When selecting snubber components, care must be taken not to use excessively large values of snubber
capacitor or excessively small values of snubber resistor. Such excessive component values may lead to
device damage due to the large resultant values of snubber discharge current. If required, please consult
the factory for assistance.
5.0 Computer Modelling Parameters
5.1 Device Dissipation Calculations
I
AV
−
V
T
0
+
V
T
0
+
4
⋅
ff
⋅
r
T
⋅
W
AV
=
2
⋅
ff
2
⋅
r
T
2
2
W
AV
=
And:
∆
T
R
th
∆
T
=
T
j
max
−
T
K
Where V
T0
=0.975V, r
T
=0.348mΩ,
R
th
= Supplementary thermal impedance, see table below and
ff
= Form factor, see table below.
Supplementary Thermal Impedance
Conduction Angle
Square wave Double Side Cooled
Square wave Single Side Cooled
Sine wave Double Side Cooled
Sine wave Single Side Cooled
6 phase (60°)
0.0285
0.0513
0.0257
0.0482
3 phase (120°)
0.0255
0.0484
0.0233
0.0463
½ wave (180°)
0.0240
0.0469
0.022
0.044
d.c.
0.0220
0.0440
Form Factors
Conduction Angle
Square wave
Sine wave
6 phase (60°)
2.449
2.778
3 phase (120°)
1.732
1.879
½ wave (180°)
1.414
1.57
d.c.
1
Data Sheet. Types W1856NC400 to W1856NC500 Issue 1
Page 3 of 9
December, 2004
WESTCODE
An IXYS Company
5.2 Calculating V
F
using ABCD Coefficients
Rectifier Diode Types W1856NC400 to W1856NC500
The on-state characteristic I
F
vs. V
F
, on page 6 is represented in two ways;
(i)
the well established V
T0
and r
T
tangent used for rating purposes and
(ii)
a set of constants A, B, C, D, forming the coefficients of the representative equation for V
F
in
terms of I
F
given below:
V
F
=
A
+
B
⋅
ln
(
I
F
)
+
C
⋅
I
F
+
D
⋅
I
F
The constants, derived by curve fitting software, are given below for both hot and cold characteristics. The
resulting values for V
F
agree with the true device characteristic over a current range, which is limited to
that plotted.
25°C Coefficients
A
B
C
D
0.641971348
0.0254553
1.77411×10
-4
-3
160°C Coefficients
A
B
C
D
0.326766748
0.05167461
2.926949 ×10
7.328941×10
-4
-3
6.294207×10
Data Sheet. Types W1856NC400 to W1856NC500 Issue 1
Page 4 of 9
December, 2004
WESTCODE
An IXYS Company
5.3 D.C. Thermal Impedance Calculation
Rectifier Diode Types W1856NC400 to W1856NC500
−
t
τ
r
t
=
∑
r
p
⋅
1
−
e
p
p
=
1
p
=
n
Where
p = 1
to
n, n
is the number of terms in the series and:
t = Duration of heating pulse in seconds.
r
t
= Thermal resistance at time t.
r
p
= Amplitude of p
th
term.
τ
p
= Time Constant of r
th
term.
The coefficients for this device are shown in the tables below:
D.C. Single Side Cooled
Term
r
p
1
0.0291698
5.67822
2
4.295845×10
1.123602
-3
3
7.57109×10
0.1407857
-3
4
2.195801×10
-3
5
1.628753×10
1.272749×10
-3
-3
τ
p
0.014381914
D.C. Double Side Cooled
Term
r
p
1
0.01177146
0.9495346
2
6.485814×10
0.1337950
-3
3
2.471007×10
0.01636628
-3
4
1.607109×10
1.255571×10
-3
-3
τ
p
6.0 Reverse recovery ratings
(i) Q
ra
is based on 50% I
rm
chord as shown in Fig. 1
Fig. 1
(ii) Q
rr
is based on a 150µs integration time i.e.
150
µ
s
Q
rr
=
(iii)
∫
i
0
rr
.
dt
t
1
K Factor
=
t
2
Data Sheet. Types W1856NC400 to W1856NC500 Issue 1
Page 5 of 9
December, 2004
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