FST80SM1-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
FST8035SM _ _
FST8040SM _ _
FST8045SM _ _
FST8050SM _ _
Industry
Part Number
81CNQ035ASL
81CNQ035ASM
81CNQ040ASL
81CNQ040ASM
81CNQ045ASL
81CNQ045ASM
Working Peak
Reverse Voltage
35V
40V
45V
50V
Repetitive Peak
Reverse Voltage
35V
40V
45V
50V
Schottky Barrier Rectifier
Guard Ring Protection
2 X 40 Amperes Avg.
175°C Junction Temperature
Reverse Energy Tested
VRRM - 35 to 50 Volts
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 0.49 volts
VFM 0.68 volts
I RM 50 mA
I RM 2.0 mA
CJ 1900 pF
TC = 145°C, Square wave, R 0JC = 0.5°C/W
T C = 145°C, Square wave, R 0JC = 1.0°C/W
8.3 ms, half sine, T J = 175°C
f = 1 KHZ, 25°C, 1µsec square wave
I FM = 40A: T J = 175°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 175°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. 2
FST80SM1 - FST80SM6
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
180
170
160
150
140
130
120
110
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
120
DC
180
Figure 2
Typical Reverse Characteristics - Per Leg
Typical Reverse Current - mAmperes
1000
175 C
100
10
1.0
0.1
.01
75 C
25 C
0
10
20
30
40
50
125 C
Reverse Voltage - Volts
www.microsemi.com
January, 2010 - Rev. 2
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