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
Electrical Specifications
Type
Power Rating
(Watts)
@ 70°C
1W
2W
2W
3W
Maximum Working
Voltage
25V
50V
60V
100V
Resistance Temperature
Coefficient
±100 ppm/°C
± 20 ppm/°C
±100 ppm/°C
± 20 ppm/°C
±100 ppm/°C
±100 ppm/°C
± 20 ppm/°C
Ohmic Range and Tolerance
0.1%, 0.5%, 1% & 5%
0.01Ω – 10.0Ω*
10.2Ω – 1KΩ
0.01Ω – 10.0Ω*
10.2Ω – 2KΩ
0.005Ω – 0.976Ω*
0.01Ω – 10.0Ω*
10.2Ω – 3.01KΩ
SM 1
SM 2
SM 2A
SM 3
*
Zero ohm available on all sizes .
Mechanical Specifications
Type
Tolerance
SM 1
SM 2
SM 2A
SM 3
A
Body
Length
±0.015
±0.4
0.260
6.6
0.410
10.4
0.475
12.1
0.629
16.0
B
Total
Length
±0.032
±0.81
0.280
7.1
0.435
11.1
0.500
12.7
0.708
18.0
C
Body
Height
±0.015
±0.4
0.140
3.6
0.180
4.6
0.140
3.6
0.256
6.5
D
Body
Width
±0.015
±0.4
0.150
3.8
0.240
6.1
0.305
7.8
0.276
7.0
E
Termination
Width
±0.015
±0.4
0.090
2.3
0.100
2.5
0.110
2.8
0.110
2.8
F
Termination
Length
±0.015
±0.4
0.100
2.5
0.115
2.9
0.115
2.9
0.115
2.9
W
-
-
0.138
3.5
0.157
4.0
0.161
4.1
0.197
5.0
H
-
-
0.130
3.3
0.157
4.0
0.157
4.0
0.165
4.2
L
-
-
0.350
8.9
0.539
13.7
0.571
14.5
0.850
21.6
Units
inches
mm
inches
mm
inches
mm
inches
mm
How to Order
SM
SEI Type
2
Code
1K
Nominal Resistance
1%
Tolerance
R
Packaging
Type
SM
NSM
Description
Standard
Non-inductive
Code
1
2
2A
3
Size
2815
4424
5031
7128
Tolerance
0.1%
0.5%
1%
5%
Type
SM 1
SM 2
SM 2A
SM 3
Pkg Qty
1,500
800
1,200
750
Description
13" Reel
13" Reel
13" Reel
13" Reel
Code
R
R
R
R
Toll Free: (888) SEI-SEIS
(888) 734-7347
www.seielect.com
65
email: marketing@seielect.com
Rev 12/07
SM Series — Surface Mount Wirewound Resistors
Performance Characteristics
Test
Moisture Resistance
Thermal Shock
Load Life @70°C – 1,000 hrs.
Shock and Vibration
Resistance to Soldering Heat
Terminal Strength
Dielectric Withstanding Voltage
Short Time Overload
Low Temperature Operation
Operating Temperature Range
Results
±1.0%
± 0.5%
±1.0%
±1.0%
±1.0
±0.5%
±0.001%/V
±0.5%
±0.5%
-55°C to +275°C
Toll Free: (888) SEI-SEIS
(888) 734-7347
www.seielect.com
66
email: marketing@seielect.com
Rev12/07
