FST8115, FST8120
F
A
N 2-PLCS
P
E
L
1
2
3
A=Common Anode
3
1
2
Common Cathode
Dim. Inches
A
C
E
F
G
H
J
K
L
M
N
P
1.180
.027
.350
1.490
.695
.088
.240
.115
.460
.065
.151
.015
1.195
.037
.370
1.510
.715
.098
.260
.135
.480
.085
.161
.025
Millimeter
29.97
0.69
8.89
37.85
17.65
2.24
6.10
2.92
11.68
1.65
3.84
0.38
30.35
0.94
9.40
38.35
18.16
2.49
6.60
3.43
12.19
2.16
4.09
0.64
Minimum Maximum Minimum Maximum Notes
1
2
3
Schottky Diode
M
3 PINS eq sp at .200
G
K
C
J
H
Note: Baseplate Common with Pin 2
1
2
3
D=Doubler
Dia.
Schottky Barrier Rectifier
Guard ring protection
Microsemi
Catalog Number
FST8115*
FST8120*
Industry
Part Number
87CNQ020A
Working Peak
Reverse Voltage
15V
20V
Repetitive Peak
Reverse Voltage
15V
20V
Common cathode center tap
2X40 Amperes avg.
125°C Junction temperature
Reverse energy tested
Low forward voltage
*Add the Suffix A for Common Anode, D for Doubler
ROHS Compliant
Electrical Characteristics
I F(AV) 80 Amps
Average forward current per pkg
I F(AV) 40 Amps
Average forward current per leg
I FSM 800 Amps
Maximum surge current per leg
Max repetitive peak reverse current per leg I R(OV) 2 Amps
VFM 0.32 Volts
Max peak forward voltage per leg
VFM 0.44 Volts
Max peak forward voltage per leg
I RM 1.0 Amp
Max peak reverse current per leg
I RM 10 mA
Max peak reverse current per leg
CJ 4000 pF
Typical junction capacitance per leg
TC = 107°C, Square wave, R0JC = 0.5°C/W
TC = 107°C, Square wave, R0JC = 1.0°C/W
8.3 ms, half sine, T J = 125°C
f = 1 KHZ, 25°C, 1µsec square wave
I FM = 40A: T J = 125°C
I FM = 40A: T J = 25°C *
VRRM, T J = 125°C*
VRRM, T J = 25°C
VR = 5.0V, T C = 25°C
*Pulse test: Pulse width 300µsec, Duty cycle 2%
Thermal and Mechanical Characteristics
Storage temp range
Operating junction temp range
Max thermal resistance per leg
Max thermal resistance per pkg
Typical thermal resistance (greased)
Mounting Base Torque
Weight
T STG
TJ
R 0JC
R 0JC
R 0CS
-55°C to 125°C
-55°C to 125°C
1.0°C/W
Junction to case
0.5°C/W
Junction to case
Case to sink
0.3°C/W
10 inch pounds maximum
0.3 ounce (8.4 grams) typical
www.microsemi.com
January, 2010 - Rev. 5
FST8115, FST8120
Figure 1
Typical Forward Characteristics - Per Leg
1000
800
600
Junction Capacitance - pF
400
Figure 3
Typical Junction Capacitance - Per Leg
100000
60000
40000
20000
10000
6000
4000
2000
1000
0.1
200
100
80
60
40
Instantaneous Forward Current - Amperes
0.5
1.0
5.0
10
50
100
Reverse Voltage - Volts
Figure 4
Forward Current Derating - Per Leg
135
130
125
120
115
110
105
100
0
60
5
10
90
15
20
120
25
30
180
35
40
45
50
DC
20
125 C
25 C
10
8.0
6.0
4.0
2.0
1.0
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Instantaneous Forward Voltage - Volts
Maximum Allowable Case Temperature - C
Maximum Power Dissipation - Watts
Average Forward Current - Amperes
Figure 5
Maximum Forward Power Dissipation - Per Leg
21
18
15
12
9
6
3
0
0
5
10
15
20
25
30
35
40
45
50
Average Forward Current - Amperes
60
90
120
DC
180
Figure 2
Typical Reverse Characteristics - Per Leg
Typical Reverse Current - mAmperes
10000
1000
100
125 C
10
1.0
0.1
0
75 C
25 C
2
4
6
8
10
12
14
16
18
20
Reverse Voltage - Volts
www.microsemi.com
January, 2010 - Rev. 5
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