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WESTCODE
An IXYS Company
Date:- 10 Mar, 2004
Data Sheet Issue:- 1
Soft Recovery Diode
Type M0872LC140 to M0872LC210
(Old Type No.: SM14-21CXC224)
Absolute Maximum Ratings
VRRM
VRSM
VOLTAGE RATINGS
Repetitive peak reverse voltage, (note 1)
Non-repetitive peak reverse voltage, (note 1)
MAXIMUM
LIMITS
1400-2100
1400-2200
UNITS
V
V
IF(AV)M
IF(AV)M
IF(AV)M
IF(RMS)
If(d.c.)
IFSM
IFSM2
I2t
I2t
Tj op
Tstg
OTHER RATINGS
Maximum average forward current, Tsink=55°C, (note 2)
Maximum average forward current. Tsink=85°C, (note 2)
Maximum average forward. Tsink=85°C, (note 3)
Nominal RMS forward current, Tsink=25°C, (note 2)
D.C. forward current, Tsink=25°C, (note 4)
Peak non-repetitive surge tp=10ms, VRM=60%VRRM, (note 5)
Peak non-repetitive surge tp=10ms, VRM10V, (note 5)
I2t capacity for fusing tp=10ms, VRM=60%VRRM, (note 5)
I2t capacity for fusing tp=10ms, VRM10V, (note 5)
Operating temperature range
Storage temperature range
Notes:-
1) De-rating factor of 0.13% per °C is applicable for Tj 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, 125°C Tj initial.
MAXIMUM
LIMITS
872
577
332
1757
1439
10
11
500×103
605×103
-40 to +125
-40 to +150
UNITS
A
A
A
A
A
kA
kA
A2s
A2s
°C
°C
Data Sheet. Types M0872LC140 to M0872LC210 Issue 1
Page 1 of 11
March, 2004

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Characteristics
Soft Recovery Diode Type M0872LC140 to M0872LC210
PARAMETER
VFM Maximum peak forward voltage
VT0 Threshold voltage
rT Slope resistance
VFRM Maximum forward recovery voltage
IRRM Peak reverse current
Qrr Recovered charge
Qra Recovered charge, 50% Chord
Irm Reverse recovery current
trr Reverse recovery time, 50% Chord
R
thJK
Thermal resistance, junction to heatsink
F Mounting force
Wt Weight
MIN.
-
-
-
-
-
-
-
-
-
-
-
-
-
10
-
TYP. MAX. TEST CONDITIONS (Note 1)
- 1.5 IFM=1200A
- 1.7 IFM=1750A
- 1.09
- 0.34
- 30 di/dt = 1000A/µs, Tj=25°C
- 40 di/dt = 1000A/µs
- 50 Rated VRRM
700 -
280 320 IFM=1000A, tp=1000µs, di/dt=60A/µs,
140 - Vr=50V, 50% Chord.
4.0 -
- 0.044 Double side cooled
- 0.088 Single side cooled
- 20
340 -
Notes:-
1) Unless otherwise indicated Tj=125°C.
UNITS
V
V
m
V
mA
µC
µC
A
µs
K/W
kN
g
Data Sheet. Types M0872LC140 to M0872LC210 Issue 1
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March, 2004

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Notes on Ratings and Characteristics
1.0 Voltage Grade Table
Voltage Grade
14
16
18
20
21
VRRM
(V)
1400
1600
1800
2000
2100
Soft Recovery Diode Type M0872LC140 to M0872LC210
VRSM
(V)
1500
1700
1900
2100
2200
VR dc
(V)
930
1040
1150
1250
1300
2.0 De-rating Factor
A blocking voltage de-rating factor of 0.13% per °C is applicable to this device for Tj below 25°C.
3.0 ABCD Constants
These constants (applicable only over current range of VF characteristic in Figure 1) are the coefficients of
the expression for the forward characteristic given below:
VF = A + B ln(I F ) + C I F + D I F
where IF = instantaneous forward current.
4.0 Reverse recovery ratings
(i) Qra is based on 50% Irm chord as shown in Fig.(a) below.
(ii) Qrr is based on a 150µs integration time.
150 µs
I.e. Qrr = irr .dt
0
(iii)
K Factor = t1
t2
Data Sheet. Types M0872LC140 to M0872LC210 Issue 1
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Soft Recovery Diode Type M0872LC140 to M0872LC210
5.0 Reverse Recovery Loss
The following procedure is recommended for use where it is necessary to include reverse recovery loss.
From waveforms of recovery current obtained from a high frequency shunt (see Note 1) and reverse
voltage present during recovery, an instantaneous reverse recovery loss waveform must be constructed.
Let the area under this waveform be E joules per pulse. A new sink temperature can then be evaluated
from:
[ ]TSINK = Tj(MAX ) E k + f RthJK
Where k = 0.2314 (°C/W)/s
E = Area under reverse loss waveform per pulse in joules (W.s.)
f = Rated frequency in Hz at the original sink temperature.
Rth(JK) = d.c. thermal resistance (°C/W)
The total dissipation is now given by:
W(tot ) = W(original ) + E f
NOTE 1 - Reverse Recovery Loss by Measurement
This device has a low reverse recovered charge and peak reverse recovery current. When measuring the
charge, care must be taken to ensure that:
(a) AC coupled devices such as current transformers are not affected by prior passage of high
amplitude forward current.
(b) A suitable, polarised, clipping circuit must be connected to the input of the measuring oscilloscope
to avoid overloading the internal amplifiers by the relatively high amplitude forward current signal.
(c) Measurement of reverse recovery waveform should be carried out with an appropriate critically
damped snubber, connected across diode anode to cathode. The formula used for the calculation of this
snubber is shown below:
R2 = 4 Vr
CS
di
dt
Where: Vr = Commutating source voltage
CS = Snubber capacitance
R = Snubber resistance
6.0 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.
Data Sheet. Types M0872LC140 to M0872LC210 Issue 1
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7.0 Computer Modelling Parameters
7.1 Device Dissipation Calculations
Soft Recovery Diode Type M0872LC140 to M0872LC210
I AV = − Vo +
Vo + 4 ff 2 rs WAV
2 ff 2 rs
Where VT0 = 1.09V, rT = 0.34m
ff = form factor (normally unity for fast diode applications)
WAV
=
T
Rth
T = Tj(MAX ) Tk
7.2 Calculation of VF using ABCD Coefficients
The forward characteristic IF Vs VF, on page 6 is represented in two ways;
(i) the well established VT0 and rT tangent used for rating purposes and
(ii) a set of constants A, B, C, and D forming the coefficients of the representative equation for VF in
terms of IF given below:
VF = A + B ln(IF ) + C I F + D IF
The constants, derived by curve fitting software, are given in this report for both hot and cold
characteristics. The resulting values for VF agree with the true device characteristic over a current range,
which is limited to that plotted.
25°C Coefficients
A 1.162077
B 5.895938×10-3
C 3.14729×10-4
D -9.380176×10-4
125°C Coefficients
A 1.087889
B 3.637731×10-3
C 3.537834×10-4
D 1.10333×10-3
8.0 Frequency Ratings
The curves illustrated in figures 8 to 16 are for guidance only and are superseded by the maximum ratings
shown on page 1.
9.0 Square wave ratings
These ratings are given for load component rate of rise of forward current of 100 and 500 A/µs.
10.0 Duty cycle lines
The 100% duty cycle is represented on all the ratings by a straight line. Other duties can be included as
parallel to the first.
Data Sheet. Types M0872LC140 to M0872LC210 Issue 1
Page 5 of 11
March, 2004