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SCHOTTKY RECTIFIER
Bulletin PD-20579 04/00
203DMQ... SERIES
200 Amp
Major Ratings and Characteristics
Characteristics
203DMQ... Units
IF(AV) Rectangular
waveform
VRRM range
IFSM @ tp = 5 µs sine
VF @100Apk,TJ=125°C
(per leg)
TJ range
200
80 to100
16,000
0.70
- 55 to 175
A
V
A
V
°C
TO-244AB isolated
Common Cathode
Description/Features
The 203DMQ center tap Schottky rectifier module series has
been optimized for low reverse leakage at high temperature.
The proprietary barrier technology allows for reliable operation
up to 175 °C junction temperature. Typical applications are in
high current switching power supplies, plating power supplies,
UPS systems, converters, free-wheeling diodes, welding, and
reverse battery protection.
175 °C TJ operation
Center tap module
High purity, high temperature epoxy encapsulation for
enhanced mechanical strength and moisture resistance
Low forward voltage drop
High frequency operation
Guard ring for enhanced ruggedness and long term
reliability
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1
2
3
Modified JEDEC
Outline TO-244AB Isolated
Dimensions in millimeters and (inches)

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203DMQ... Series
Bulletin PD-20579 04/00
Voltage Ratings
Part number
VR Max. DC Reverse Voltage (V)
VRWM Max. Working Peak Reverse Voltage (V)
Absolute Maximum Ratings
203DMQ080
80
203DMQ100
100
Parameters
203DMQ Units
Conditions
IF(AV) Max.AverageForward
Current * See Fig. 5 (Per Device)
I FSM Max.PeakOneCycleNon-Repetitive
SurgeCurrent (Per Leg) *SeeFig.7
EAS Non-RepetitiveAvalancheEnergy
(Per Leg)
IAR RepetitiveAvalancheCurrent
(Per Leg)
200
16,000
2,100
15
1
A 50%dutycycle@TC=107°C,rectangularwaveform
5µs Sine or 3µs Rect. pulse Following any rated
A load condition and with
10ms Sine or 6ms Rect. pulse rated VRRMapplied
mJ TJ = 25 °C, IAS = 1 Amps, L = 30 mH
A Currentdecayinglinearlytozeroin1µsec
Frequency limited by TJ max. VA = 1.5 x VR typical
Electrical Specifications
Parameters
203DMQ Units
Conditions
VFM Max. Forward Voltage Drop
(Per Leg) * See Fig. 1
(1)
0.86 V @ 100A
1.03 V @ 200A
0.70 V @ 100A
0.84 V @ 200A
TJ = 25 °C
TJ = 125 °C
IRM Max. Reverse Leakage Current
(Per Leg) * See Fig. 2 (1)
3
40
VF(TO) Threshold Voltage
rt Forward Slope Resistance
CT Max. Junction Capacitance (Per Leg)
LS Typical Series Inductance (Per Leg)
dv/dt Max. Voltage Rate of Change
(Rated VR)
0.50
1.08
2,650
7.0
10,000
Thermal-Mechanical Specifications
mA TJ = 25 °C
mA TJ = 125 °C
V TJ = TJ max.
m
VR = rated VR
pF VR = 5VDC, (test signal range 100KHz to 1MHz) 25°C
nH From top of terminal hole to mounting plane
V/ µs
(1) Pulse Width < 300µs, Duty Cycle <2%
Parameters
203DMQ Units
Conditions
TJ Max. Junction Temperature Range
Tstg Max. Storage Temperature Range
- 55 to 175 °C
- 55 to 175 °C
RthJC Max. Thermal Resistance Junction
to Case (Per Leg)
0.70 °C/W DCoperation * See Fig. 4
RthJC Max. Thermal Resistance Junction
to Case(Per Package)
0.35 °C/W DCoperation
RthCS Typical Thermal Resistance, Case
to Heatsink
0.10 °C/W Mounting surface , smooth and greased
wt Approximate Weight
79(2.80) g(oz.)
T Mounting Torque
Min. 40 (35) Kg-cm
Max. 58 (50) (Ibf-in)
Mounting Torque Center Hole Typ. 17 (15)
Terminal Torque
Min. 58 (50)
Max. 86 (75)
www.DataSheet4U.comCase Style
TO-244AB Isolated Modified JEDEC
2 www.irf.com

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1000
100
10
TJ = 175˚C
TJ = 125˚C
T = 25˚C
J
203DMQ... Series
Bulletin PD-20579 04/00
1000
100
T J= 175˚C
150˚C
10 125˚C
100˚C
1
75˚C
0.1 50˚C
0.01 25˚C
0.001
0
20 40 60 80 100
ReverseVoltage-VR(V)
Fig. 2 - Typical Values Of Reverse Current
Vs. Reverse Voltage (PerLeg)
10000
1000
TJ = 25˚C
1
0 0.2 0.4 0.6 0.8 1 1.2 1.4
Forward Voltage Drop - VFM (V)
Fig.1-Max. Forward Voltage Drop Characteristics
(PerLeg)
1
D = 0.75
D = 0.50
D = 0.33
D = 0.25
0.1 D = 0.20
100
0
20 40 60 80 100
Reverse Voltage - VR (V)
Fig. 3 - Typical Junction Capacitance
Vs. Reverse Voltage (Per Leg)
PDM
0.01
0.001
0.00001
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Single Pulse
(Thermal Resistance)
t1
t2
Notes:
1. Duty factor D = t1/ t2
2. Peak Tj = Pdm x ZthJC + Tc
0.0001
0.001
0.01
0.1
1
t 1 , Rectangular Pulse Duration (Seconds)
10
Fig. 4 - Max. Thermal Impedance ZthJC Characteristics (Per Leg)
100
3

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203DMQ... Series
Bulletin PD-20579 04/00
180
160
140
DC
120
80% Square Wave
(D = 0.50)
100
see note (2)
80
0 50 100 150 200 250 300
Average Forward Current - I F(AV) (A)
Fig.5-Max. Allowable CaseTemperature
Vs. Average Forward Current (PerLeg)
100000
At Any Rated Load Condition
And With Rated Vrrm Applied
Following Surge
250
D = 0.75
D = 0.50
200 D = 0.33
D = 0.25
D = 0.20
150
RMS Limit
100
DC
50
0
0 50 100 150 200 250 300
Average Forward Current - IF(AV) (A)
Fig.6-Forward Power Loss Characteristics
(PerLeg)
10000
D UT
C URRENT
M O N ITO R
1000
10
100
1000
10000
Square Wave Pulse Duration - tp(microsec)
Fig.7-Max. Non-Repetitive Surge Current (PerLeg)
L
IRFP4 60
Rg = 25 ohm
H IG H -SP E ED
SW ITC H
FR EE-W HEEL
D IO D E
40 HFL4 0 S02
+ V d = 2 5 V olt
Fig. 8 - Unclamped Inductive Test Circuit
(2) Formula used: T = T - (Pd + Pd ) x R ;
CJ
REV
thJC
Pd = Forward Power Loss = IF(AV) x VFM @ (IF(AV) / D) (see Fig. 6);
www.DataSheet4U.cPodmREV = Inverse Power Loss = VR1 x IR (1 - D); IR @ VR1= 80% rated VR
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203DMQ... Series
Bulletin PD-20579 04/00
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