FST81SM1-SM6 Series
A1
K
N
2-PLCS.
E
L
M
3 PINS eq sp at .200
G
J
C
H
1
1
Schottky Power Surface Mount
A2
Dim. Inches
3
Millimeter
Minimum Maximum Minimum Maximum Notes
2
F
1
2
3
1
2
3
Common Cathode
SM3 & SM4
A3
1
2
3
A=Common Anode
3
SM1 & SM2
B
D
2
A1
A2
A3
B
C
D
E
F
G
H
J
K
L
M
N
1.490
1.020
.695
.110
.027
.100
.350
.015
.695
.088
.240
1.180
.230
.065
.151
1.510
1.040
.715
.120
.037
.110
.370
.025
.715
.098
.260
1.195
.250
.085
.161
37.85
26.12
17.65
2.79
0.69
2.54
8.89
0.38
17.65
2.24
6.10
29.97
5.84
1.65
3.84
38.35
26.42
18.16
3.04
0.94
2.79
9.40
0.64
18.16
2.49
6.60
30.35
6.35
2.16
4.09
B
D
SM5 & SM6
1
2
3
D=Doubler
TYP. PIN CONFIGURATION
FOR SM1, SM3, & SM5
TYP. PIN CONFIGURATION
FOR SM2, SM4, & SM6
Dia.
Note: Baseplate Common with Pin 2
Microsemi Catalog
Catalog Number
1 2
FST8135SM _ _
FST8140SM _ _
FST8145SM _ _
Industry
Part Number
80CNQ035ASL
80CNQ035ASM
80CNQ040ASL
80CNQ040ASM
80CNQ045ASL
80CNQ045ASM
Working Peak
Reverse Voltage
35V
40V
45V
Repetitive Peak
Reverse Voltage
35V
40V
45V
Schottky Barrier Rectifier
Guard Ring Protection
Common Cathode
Center Tap
Low Forward Voltage
2 X 40 Amperes Avg.
150°C Junction Temperature
Reverse Energy Tested
ROHS Compliant
Note: 1 Specify (1-6) to identify package desired
2 Specify C-Common Cathode, A-Common Anode, D-Doubler
Electrical Characteristics
Average forward current per pkg
Average forward current per leg
Maximum surge current per leg
Max repetitive peak reverse 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
Typical junction capacitance per leg
I F(AV) 80 Amps
I F(AV) 40 Amps
I FSM 800 Amps
I R(OV) 2 Amps
VFM 0.47 volts
VFM 0.53 volts
I RM 500 mA
I RM 3.0 mA
CJ 2100 pF
TC = 110°C, Square wave, R 0JC = 0.5°C/W
TC = 110°C, Square wave, R 0JC = 1.0°C/W
8.3 ms, half sine, T J = 150°C
f = 1 KHZ, 25°C, 1µsec square wave
I FM = 40A: T J = 150°C*
I FM = 40A: T J = 25°C*
VRRM, T C = 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 OJC
R OJC
R OCS
-55°C to 175°C
-55°C to 150°C
1.0°C/W
Junction to case
Junction to case
0.5°C/W
Case to sink
0.3°C/W
10 inch pounds maximum (SM1, 2)
SM1-2 0.3 ounce (8.4 grams) typical
SM3-4 0.24 ounce (6.7 grams) typical
SM5-6 0.18 ounce (5.2 grams) typical
www.microsemi.com
January, 2010 - Rev. 4
FST81SM1 - SM6
Figure 1
Typical Forward Characteristics - Per Leg
1000
800
600
Junction Capacitance - pF
400
Figure 3
Typical Junction Capacitance - Per Leg
10000
6000
4000
2000
1000
600
400
200
100
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
150
140
130
120
110
100
90
80
0
0.5
10
15
60
20
90
25
30
120
35
180
40
45
DC
50
20
150 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
35
30
25
20
15
10
5.0
0
0
5.0
10
15
20
25
30
35
40
45
50
Average Forward Current - Amperes
60
90
180
120
DC
Figure 2
Typical Reverse Characteristics - Per Leg
Typical Reverse Current - Amperes
1000
150 C
100
10
1.0
0.1
.01
0
10
20
30
40
50
Reverse Voltage - Volts
25 C
125 C
75 C
www.microsemi.com
January, 2010 - Rev. 4
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