ROHS Compliant
Microsemi
Catalog Number
FST20040*
FST20045*
FST20050*
50V
45V
40V
Reverse Voltage
Repetitive Peak
Schottky Barrier Rectifier
Guard Ring Protection
Electrical Characteristics
Average forward current per pkg
Average forward current per leg
Maximum surge current per leg
Max peak forward voltage per leg
Max peak forward voltage per leg
Max peak reverse current per leg
Max peak reverse current per leg
F(AV)
F(AV)
FSM
FM
FM
RM
RM
I
I
I
V
V
I
I
T
T
V
I
I
T
T
T
T
T
Thermal and Mechanical Characteristics
200 Amperes/35 to 50 Volts
Storage temp range
Operating junction temp range
Max thermal resistance per leg
Typical thermal resistance (greased)
Terminal Torque
35-50 inch pounds
T
T
O
O
R
R
30-40 inch pounds
Mounting Base Torque
Case to sink
Working Peak
Reverse Voltage
40V
45V
50V
*Add Suffix A for Common Anode, D for Doubler
Reverse Energy Tested
Typical junction capacitance per leg
J
C
V
T
Maximum repetitive reverse current per leg
R(OV)
I
*Pulse test: Pulse width 300µsec, Duty cycle 2%
FST20035*
35V35V
Weight
3.4 ounces (95 grams) typical
Schottky PowerMod
FST20035 - FST20050
175 C Junction Temperature
C = 143°C, Square wave, 0JC = 0.25°C/W
C = 143°C, Square wave, 0JC = 0.50°C/W
8.3ms, half sine, J = 175°C
f = 1 KHZ, 25°C, 1µsec square wave
FM = 200A: J = 25°C*
FM = 200A: J = 175°C*
RRM, J = 125°C*
RRM, J = 25°C
R = 5.0V, C = 25°C
V
-55°C to 175°C
-55°C to 175°C
STG
J
JC
CS
Junction to case
0.08°C/W
0.05°C/W
4600 pF
4.0 mA
75 mA
0.60 Volts
0.80 Volts
2 Amps
2000 Amps
100 Amps
200 Amps
Captive Lockwasher
1/4-20UNC with
E
0.625
---
15.88
---
D
17.78
0.700
7.670
7.140
0.3000.280
A
B
F
C
D
G
Baseplate
Common Cathode
Baseplate
A=Common Anode
Baseplate
D=Doubler
Notes:
Baseplate: Nickel plated
copper
Dim. Inches
Millimeters
A
B
C
E
F
G
---
34.29
79.76
---
62.23
35.56
20.32
80.26
92.71
---
1.350
3.140
---
2.450
1.400
0.800
3.160
3.650
Dia.
Min.
Max.
Min.
Max.
Notes
R
R
TO-244AB
Max thermal resistance per pkg
JC
R
O
0.25°C/W
Junction to case
January, 2010 - Rev. 4
www.microsemi.com
25 C
Instantaneous Forward Voltage - Volts
Instantaneous Forward Current - Amperes
1000
800
600
400
200
100
80
60
40
20
10
8.0
6.0
4.0
2.0
1.0
Figure 1
Figure 2
50
100
5.0
10
1.0
0.5
100,000
60,000
40,000
20,000
10,000
6000
4000
2000
1000
Figure 3
0.1
Junction Capacitance - pF
100
10
1.0
0.1
Reverse Voltage - Volts
10
20 30 40
Reverse Voltage - Volts
50
.01
Typical Reverse Current - mA
175 C
75 C
25 C
Forward Current Derating - Per Leg
Figure 4
Average Forward Current - Amperes
Maximum Allowable Case Temperature - C
175
165
155
145
030
180
120
60 90
DC
0
0 30
Average Forward Current - Amperes
Maximum Power Dissipation - Watts
Figure 5
Maximum Forward Power Dissipation - Per Leg
60
90
120
180
DC
FST20035 - FST20050
Typical Forward Characteristics - Per Leg
Typical Junction Capacitance - Per Leg
Typical Reverse Characteristics - Per Leg
0
0.2 0.4 0.6 0.8
1.0 1.2 1.4
1000
125 C
0
105
115
125
135
60 90
120 150
60 90
120 150
105
90
75
60
45
30
15
175 C
January, 2010 - Rev. 4
www.microsemi.com
