ROHS Compliant
Electrical Characteristics
Thermal and Mechanical Characteristics
.015
.025 0.38 0.64
.085.065
2.161.65
.260.240 6.60
6.10
.098.088 2.492.24
.370.350 9.40
8.89
.110
.120
.100
2.54
2.79 3.04
D
Millimeter
Notes
Maximum
Minimum
Maximum
Minimum
29.97 30.35
1.180 1.195
E
F
G
H
J
K
L
Dim. Inches
26.12
26.42
1.020 1.040
.695
.715
17.65
18.16
Schottky Power Surface Mount
.110
2.79
FST80SM1-SM6 Series
35V
40V
45V 45V
40V
35V
M
1.490
1.510
37.85 38.35
N
.695
.715
17.65
18.16
.027 .037 0.69 0.94
Microsemi Catalog
Catalog Number
Working Peak
Reverse Voltage
Repetitive Peak
Reverse Voltage
32
1
M
3 PINS eq sp at .200
G
C
H
J
N
E
32
1
L
32
1
F
A1
A2
A3
SM1 & SM2
SM3 & SM4
SM5 & SM6
B
D
A1
A2
A3
B
C
.151 .161
3.84 4.09
FOR SM2, SM4, & SM6
Dia.
TYP. PIN CONFIGURATION
D
B
TYP. PIN CONFIGURATION
FOR SM1, SM3, & SM5
K
T
T
J
STG
Typical thermal resistance (greased)
Max thermal resistance per pkg.
Max thermal resistance per leg
Operating junction temp range
Storage temp range
R
OJC
1.0°C/W
0.5°C/W
0.3 ounce (8.4 grams) typical
Weight
Mounting Base Torque
-55°C to 175°C
-55°C to 175°C
Case to sink
*Pulse test: Pulse width 300µsec, Duty cycle 2%
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
Typical junction capacitance per leg
F(AV) 80 Amps
F(AV) 40 Amps
FSM 800 Amps
R(OV) 2 Amps
FM 0.49 volts
FM 0.68 volts
RM 50 mA
J 1900 pF
RM 2.0 mA
I
I
I
I
V
V
I
I
C
C = 145°C, Square wave, 0JC = 0.5°C/W
C = 145°C, Square wave, 0JC = 1.0°C/W
8.3 ms, half sine, J = 175°C
f = 1 KHZ, 25°C, 1µsec square wave
FM = 40A: J = 175°C*
FM = 40A: J = 25°C*
RRM, C = 125°C*
RRM, J = 25°C
R = 5.0V, C = 25°C
R
R
V
V
V
I
I
T
T
T
T
T
T
.230 .250 5.84 6.35
2 Specify C-Common Cathode, A-Common Anode, D-Doubler
10 inch pounds maximum (SM1, 2)
SM1-2
SM3-4
ounce (
grams) typical
ounce (
grams) typical
Note: 1 Specify (1-6) to identify package desired
FST8035SM _ _
FST8040SM _ _
FST8045SM _ _
1
2
6.7
5.2
0.24
0.18
SM5-6
T
T
OJC
R
Junction to case
Junction to case
0.3°C/W
OCS
R
Note: Baseplate Common with Pin 2
2-PLCS.
D=Doubler
A=Common Anode
Common Cathode
1
2
1
2
1
2
3
3
3
Max peak reverse current per leg
Industry
Part Number
81CNQ035ASL
81CNQ040ASL
81CNQ045ASL
81CNQ035ASM
81CNQ040ASM
81CNQ045ASM
FST8050SM _ _
50V 50V
Reverse Energy Tested
V
175°C Junction Temperature
2 X 40 Amperes Avg.
RRM - 35 to 50 Volts
Guard Ring Protection
Schottky Barrier Rectifier
January, 2010 - Rev. 2
www.microsemi.com
FST80SM1 - FST80SM6
Instantaneous Forward Current - Amperes
Typical Reverse Current - mAmperes
Reverse Voltage - Volts
0
75 C
25 C
.01
0.1
10
20 4030 50
Typical Reverse Characteristics - Per Leg
Instantaneous Forward Voltage - Volts
100
125 C
10
1.0
175 C
1000
Figure 2
0
1.0
0.2
2.0
4.0
0.4 0.6 0.8
1.0 1.2 1.4
600
25 C
60
150 C
6.0
8.0
10
20
40
200
100
80
400
Typical Forward Characteristics - Per Leg
Figure 1
800
1000
Maximum Allowable Case Temperature - C
50
50
Maximum Power Dissipation - Watts
Average Forward Current - Amperes
0
5.0
0
10
10
5.0
15
3520 25 30 40 45
Maximum Forward Power Dissipation - Per Leg
Average Forward Current - Amperes
20
15
25
Figure 5
30
35
120
0
110
130
150
140
10
0.5
15
90
60
120 180
DC
120
3520 25
60 90
30
180
40 45
DC
100
Reverse Voltage - Volts
Forward Current Derating - Per Leg
160
180
170
Figure 4
0.1
0.5
1.0
Junction Capacitance - pF
600
200
100
400
1000
2000
4000
10
5.0
50
Typical Junction Capacitance - Per Leg
6000
10000
Figure 3
January, 2010 - Rev. 2
www.microsemi.com
