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Date:- 27 Nov, 2014
Data Sheet Issue:- 2
Soft Recovery Diode
Type M0280S/R#200 to M0280S/R#250
Absolute Maximum Ratings
VRRM
VRSM
VOLTAGE RATINGS
Repetitive peak reverse voltage, (note 1)
Non-repetitive peak reverse voltage, (note 1)
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=100°C, (note 2)
Nominal RMS forward current, Tsink=25°C, (note 2)
D.C. forward current, Tsink=25°C, (note 3)
Peak non-repetitive surge tp=10ms, VRM=60%VRRM, (note 3)
Peak non-repetitive surge tp=10ms, VRM10V, (note 3)
I2t capacity for fusing tp=10ms, VRM=60%VRRM, (note 3)
I2t capacity for fusing tp=10ms, VRM10V, (note 3)
Operating temperature range
Storage temperature range
Notes:-
1) De-rating factor of 0.13% per °C is applicable for Tj below 25°C.
2) single phase; 50Hz, 180° half-sinewave.
3) Half-sinewave, 125°C Tj initial.
MAXIMUM
LIMITS
2000-2500
2100-2600
UNITS
V
V
MAXIMUM
LIMITS
280
123
573
453
4500
4950
100×103
123×103
-40 to +125
-40 to +150
UNITS
A
A
A
A
A
A
A2s
A2s
°C
°C
Data Sheet. Types M0280S/R#200 to M0280S/R#250 Issue 2
Page 1 of 9
November 2014

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Characteristics
Soft Recovery Diode Types M0280S/R#200 to M0280S/R#250
PARAMETER
MIN. TYP. MAX. TEST CONDITIONS (Note 1)
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
RthJC Thermal resistance, junction to case
T Mounting torque
Wt Weight
- - 1.71 IFM=470A
- - 1.28
- - 0.92
- 51 - di/dt = 400A/µs
- - 20 Rated VRRM
- - 730
- - 342 IFM=1000A, tp=200µs, di/dt=150A/µs,
- - 265 Vr=50V.
- 2.8 -
- - 0.13
24.5 -
- 220
- 250
27
- S/RJ housing option
- S/RC housing option
Notes:-
1) Unless otherwise indicated Tj=125°C.
UNITS
V
V
m
V
mA
µC
µC
A
µs
K/W
Nm
g
Data Sheet. Types M0280S/R#200 to M0280S/R#250 Issue 2
Page 2 of 9
November 2014

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Notes on Ratings and Characteristics
1.0 Voltage Grade Table
Voltage Grade
20
25
VRRM
(V)
2000
2500
Soft Recovery Diode Types M0280S/R#200 to M0280S/R#250
VRSM
(V)
2100
2600
VR dc
(V)
1250
1500
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(IF ) C IF D IF
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 150s integration time.
150s
I.e. Qrr irr.dt
0
(iii)
K Factor t1
t2
Data Sheet. Types M0280S/R#200 to M0280S/R#250 Issue 2
Page 3 of 9
November 2014

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Soft Recovery Diode Types M0280S/R#200 to M0280S/R#250
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.
RthJK = 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 didt
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 M0280S/R#200 to M0280S/R#250 Issue 2
Page 4 of 9
November 2014

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7.0 Computer Modelling Parameters
7.1 Device Dissipation Calculations
Soft Recovery Diode Types M0280S/R#200 to M0280S/R#250
I AV   VT 0
VT 0 4 ff 2 rT WAV
2 ff 2 rT
Where VT0 =1.28V, rT = 0.92m
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 IF 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.
125°C Coefficients
A 0.1805148
B 0.2223172
C 0.924871×10-3
D -0.01399568
Data Sheet. Types M0280S/R#200 to M0280S/R#250 Issue 2
Page 5 of 9
November 2014