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Date:- 17 Jan, 2003
Data Sheet Issue:- 1
Fast Recovery Diode
Type M0914LC200 to M0914LC250
Old Type No.: SM18-25CXC804
Absolute Maximum Ratings
VRRM
VRSM
VOLTAGE RATINGS
Repetitive peak reverse voltage, (note 1)
Non-repetitive peak reverse voltage, (note 1)
MAXIMUM
LIMITS
2000-2500
2100-2600
UNITS
V
V
IF(AVM)
IF(AVM)
IF(AVM)
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=0.6VRRM, (note 5)
Peak non-repetitive surge tp=10ms, VRM10V, (note 5)
I2t capacity for fusing tp=10ms, VRM=0.6VRRM, (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, 150°C Tj initial.
MAXIMUM
LIMITS
914
578
337
1730
1442
8.5
9.4
361×103
442×103
-40 to +150
-40 to +150
UNITS
A
A
A
A
A
kA
kA
A2s
A2s
°C
°C
Data Sheet. Types M0914LC200 to M0914LC250 Issue 1
Page 1 of 11
January, 2003

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Characteristics
Fast Recovery Diode Type M0914LC200 to M0914LC250
PARAMETER
VFM Maximum peak forward voltage
VT0
rT
VFRM
Threshold voltage
Slope resistance
Maximum forward recovery voltage
IRRM Peak reverse current
Qrr
Qra
Irm
trr
RthJK
Recovered charge
Recovered charge, 50% Chord
Reverse recovery current
Reverse recovery time, 50% Chord
Thermal resistance, junction to heatsink
F Mounting force
Wt Weight
MIN.
-
-
-
-
-
-
-
-
-
-
-
-
-
10
-
TYP.
-
-
-
-
-
-
-
300
170
110
3.2
-
-
-
340
MAX. TEST CONDITIONS (Note 1)
4.1
3.0
1.768
IFM=3770A
IFM=1800A
0.653
75 di/dt = 1000A/µs
50 Rated VRRM
50 Rated VRRM, Tj=25°C
-
250 IFM=1000A, tp=1000µs, di/dt=60A/µs,
- Vr=50V, 50% Chord.
-
0.032 Double side cooled
0.064 Single side cooled
20
-
Notes:-
1) Unless otherwise indicated Tj=150°C.
UNITS
V
V
m
V
mA
µC
µC
A
µs
K/W
kN
g
Data Sheet. Types M0914LC200 to M0914LC250 Issue 1
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Notes on Ratings and Characteristics
1.0 Voltage Grade Table
Voltage Grade
20
22
25
VRRM
(V)
2000
2200
2500
Fast Recovery Diode Type M0914LC200 to M0914LC250
VRSM
(V)
2100
2300
2600
VR dc
(V)
1250
1350
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(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 M0914LC200 to M0914LC250 Issue 1
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Fast Recovery Diode Type M0914LC200 to M0914LC250
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 Rth(J Hs)
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(J-Hs) = 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 M0914LC200 to M0914LC250 Issue 1
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7.0 Computer Modelling Parameters
7.1 Device Dissipation Calculations
Fast Recovery Diode Type M0914LC200 to M0914LC250
I AV = − Vo +
Vo + 4 ff rs WAV
2 ff rs
Where V0 = 1.768V, rs = 0.653m
ff = form factor (normally unity for fast diode applications)
WAV
=
T
Rth
T = Tj(MAX ) THs
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 Vo and rs 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 hot 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 0.806428
B 0.1553537
C 3.4543×10-4
D 8.80253×10-3
150°C Coefficients
A 0.5176484
B 0.1144229
C 2.48156×10-4
D 0.02779502
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 M0914LC200 to M0914LC250 Issue 1
Page 5 of 11
January, 2003