Schottky Power Surface Mount
FST80SM1-SM6 Series
A1
A2
Dim. Inches
Millimeter
K
N
2-PLCS.
Minimum Maximum Minimum Maximum Notes
1
2
3
F
E
1
2
3
A1
38.35
26.42
1.490
1.510
1.040
37.85
26.12
L
1 2 3
Common Cathode
A2 1.020
M
.695
.110
.027
.715
.120
.037
.110
.370
.025
.715
17.65
2.79
0.69
2.54
8.89
0.38
17.65
18.16
3.04
0.94
A3
B
3 PINS eq sp at .200
SM3 & SM4
C
G
D .100
2.79
9.40
0.64
A3
J
E
F
.350
.015
1 2 3
A=Common Anode
C
H
1
2
3
G .695
18.16
2.49
SM1 & SM2
H
.088
J .240
.098
2.24
.260
1.195
.250
.085
.161
6.10
29.97
5.84
1.65
6.60
30.35
6.35
2.16
B
D
B
D
K
L
1.180
.230
1 2 3
D=Doubler
SM5 & SM6
M .065
.151
TYP. PIN CONFIGURATION TYP. PIN CONFIGURATION
FOR SM1, SM3, & SM5
FOR SM2, SM4, & SM6
Dia.
3.84
4.09
N
Note: Baseplate Common with Pin 2
Microsemi Catalog
Catalog Number
Industry
Working Peak
Repetitive Peak
Schottky Barrier Rectifier
Guard Ring Protection
Part Number Reverse Voltage Reverse Voltage
1 2
81CNQ035ASL
81CNQ035ASM
81CNQ040ASL
81CNQ040ASM
81CNQ045ASL
81CNQ045ASM
35V
40V
35V
40V
FST8035SM _ _
FST8040SM _ _
2 X 40 Amperes Avg.
175°C Junction Temperature
Reverse Energy Tested
FST8045SM _ _
FST8050SM _ _
45V
50V
45V
50V
V
RRM - 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
I
I
I
R
R
T
T
F(AV) 80 Amps
F(AV) 40 Amps
C = 145°C, Square wave, 0JC = 0.5°C/W
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
C = 145°C, Square wave, 0JC = 1.0°C/W
T
FSM 800 Amps 8.3 ms, half sine, J = 175°C
R(OV) 2 Amps f = 1 KHZ, 25°C, 1µsec square wave
I
V
V
I
I
C
I
I
V
V
V
T
FM 0.49 volts
FM 0.68 volts
RM 50 mA
FM = 40A: J = 175°C*
T
FM = 40A: J = 25°C*
T
RRM, C = 125°C*
T
RRM, J = 25°C
RM 2.0 mA
J 1900 pF
T
R = 5.0V, C = 25°C
*Pulse test: Pulse width 300µsec, Duty cycle 2%
Thermal and Mechanical Characteristics
T
T
R
R
R
Storage temp range
STG
J
OJC
OJC
-55°C to 175°C
-55°C to 175°C
1.0°C/W Junction to case
Operating junction temp range
Max thermal resistance per leg
Max thermal resistance per pkg.
Typical thermal resistance (greased)
Mounting Base Torque
Junction to case
0.5°C/W
OCS
0.3°C/W Case to sink
10 inch pounds maximum (SM1, 2)
SM1-20.3 ounce (8.4 grams) typical
Weight
0.24
0.18
ounce (
6.7
5.2
ounce (
grams) typical
grams) typical
SM3-4
SM5-6
www.microsemi.com
January, 2010 - Rev. 2