SM Series
Surface Mount Wirewound Resistors
Features:
•
•
•
•
•
High temperature molded encapsulation
Flex termination for absorbing thermal expansion
All welded construction
Non-inductive types available as NSM
RoHS compliant / lead-free
Stackpole Electronics, Inc.
Resistive Product Solutions
Electrical Specifications
Type / Code
SM 1
SM 2
SM 2A
SM 3A
SM 3
SM 4
Power Rating
(Watts) @ 70ºC
1W
2W
2W
3W
3W
4W
Maximum
Working
Voltage
25V
50V
60V
60V
100V
100V
Dielectric
Withstanding
Voltage
>500V
>500V
>500V
>500V
>500V
>500V
Resistance Temperature
Coefficient
±100 ppm/ºC ± 20 ppm/ºC
±100 ppm/ºC ± 20 ppm/ºC
±75 ppm/ºC
±75 ppm/ºC
±100 ppm/ºC ± 20 ppm/ºC
±100 ppm/ºC ± 20 ppm/ºC
Ohmic Range(Ω) and Tolerance
0.1%, 0.5%, 1%, 5%
0.01 - 10(1)
10.2 - 1K
0.01 - 10(1)
10.2 - 2K
0.01 - 0.06(1)
0.01 - 0.06(1)
0.01 - 10(1)
10.2 - 3.01K
0.01 - 10(1)
10.2 - 5K
(1) Zero ohm available on all sizes
Power Derating Curve
Power Derating Curve:
Percent Rated Power (%)
100
75
50
25
0
25
50
70
100
150
200
250
275
300
Ambient Temperature (ºC)
How to Order
SEI Type
Code
Nominal
Resistance
Tolerance
Packaging
SM
Type
SM
NSM
Description
Standard
Non-inductive
Code
1
2
2A
3A
3
4
2
Size
2815
4324
4827
4827
6528
8035
1K
1%
Tolerance
0.1%
0.5%
1%
5%
Types
SM 1
SM 2
SM 2A
SM 3, 3A
SM4
Qty
1,500
800
1,200
750
350
R
Description
Code
13" Reel
R
Rev Date: 02/02/2010
This specification may be changed at any time without prior notice
Please confirm technical specifications before you order and/or use.
77
www.seielect.com
marketing@seielect.com
SM Series
Surface Mount Wirewound Resistors
Stackpole Electronics, Inc.
Resistive Product Solutions
Mechanical Specifications
Type / Code
SM 1
SM 2
SM 2A
SM 3A
SM 3
SM 4
A
Body
Length
0.26 ± 0.015
6.6 ± 0.4
0.41 ± 0.015
10.4 ± 0.4
0.455 ± 0.015
11.6 ± 0.4
0.455 ± 0.015
11.6 ± 0.4
0.625 ± 0.015
15.9 ± 0.4
0.8 ± 0.015
20.3 ± 0.4
B
Total
Length
0.28 ± 0.032
7.1 ± 0.81
0.43 ± 0.032
10.9 ± 0.81
0.475 ± 0.032
12.1 ± 0.81
0.475 ± 0.032
12.1 ± 0.81
0.645 ± 0.032
16.4 ± 0.81
0.825 ± 0.032
21.0 ± 0.81
C
Body
Height
0.14 ± 0.015
3.6 ± 0.4
0.18 ± 0.015
4.6 ± 0.4
0.15 ± 0.015
3.8 ± 0.4
0.15 ± 0.015
3.8 ± 0.4
0.25 ± 0.015
6.4 ± 0.4
0.362 ± 0.015
9.2 ± 0.4
D
Body
Width
0.15 ± 0.015
3.8 ± 0.4
0.24 ± 0.015
6.1 ± 0.4
0.27 ± 0.015
6.9 ± 0.4
0.27 ± 0.015
6.9 ± 0.4
0.275 ± 0.015
7.0 ± 0.4
0.35 ± 0.015
8.9 ± 0.4
E
Termination
Width
0.1 ± 0.015
2.5 ± 0.4
0.122 ± 0.015
3.1 ± 0.4
0.122 ± 0.015
3.1 ± 0.4
0.122 ± 0.015
3.1 ± 0.4
0.122 ± 0.015
3.1 ± 0.4
0.24 ± 0.015
6.1 ± 0.4
F
Termination
Length
0.09 ± 0.015
2.3 ± 0.4
0.09 ± 0.015
2.3 ± 0.4
0.105 ± 0.015
2.7 ± 0.4
0.105 ± 0.015
2.7 ± 0.4
0.13 ± 0.015
3.3 ± 0.4
0.123 ± 0.015
3.1 ± 0.4
W
0.138
3.5
0.181
4.6
0.169
4.3
0.169
4.3
0.236
6.2
0.34
8.6
H
0.13
3.3
0.157
4.0
0.157
4.0
0.157
4.0
0.165
4.2
0.19
4.8
L
0.35
8.9
0.583
14.8
0.587
14.9
0.587
14.9
0.85
21.6
0.95
24.1
Units
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
inches
mm
Performance Characteristics
Test
Moisture Resistance
Thermal Shock
Load Life @ 70ºC - 1,000 hrs.
Shock and Vibration
Resistance to Soldering Heat
Terminal Strength
Dielectric Withstanding Voltage
Short Time Overload
Low Temperature Operation
Operating Temperature Range: -55ºC to +275ºC
Results
±1%
±0.5%
±1%
±1%
±1
±0.5%
±0.001% / V
±0.2%
±0.5%
Rev Date: 02/02/2010
This specification may be changed at any time without prior notice
Please confirm technical specifications before you order and/or use.
78
www.seielect.com
marketing@seielect.com
PCB Design
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