SM/ SMX Series — Surface Mount - Wirewound/ Film
Features
SM - Wirewound Element
SMX - Metal Oxide Element
• High temperature molded encapsulation
• SMX: economical SMT 2 and 3watt
• Flex termination for absorbing thermal expansion
• SMX extends value range up to 470K
• All welded construction
• Both are RoHS compliant/ lead-free
• Available in non-inductive styles
Electrical Specifications
Ohmic Range and Tolerance
Power Rating
(Watts)
@ 70°C
Maximum
Working Voltage
Resistance
Temperature
Coefficient
0.1% & 0.5%
1%
5%
SM 1
1W
25
±100 ppm/°C
± 20 ppm/°C
0.01Ω – 10Ω*
10Ω – 1K
0.01Ω – 10Ω*
10Ω – 1K
0.01Ω – 10Ω*
10Ω – 1K
SM 2
2W
50
±100 ppm/°C
± 20 ppm/°C
0.01Ω – 10Ω*
10Ω – 2K
0.01Ω – 10Ω*
10Ω – 2K
0.01Ω – 10Ω*
10Ω – 2K
SMX 2
2W
350
±200 ppm/°C
–
2.0K – 100K
2.0K – 470K
SM 2A
2W
60
±100 ppm/°C
0.005Ω – 0.976Ω*
0.005Ω – 0.976Ω*
0.005Ω – 0.976Ω*
SM 3
3W
100
±100 ppm/°C
± 20 ppm/°C
0.01Ω – 10Ω*
10Ω – 3.01K
0.01Ω – 10Ω*
10Ω – 3.01K
0.01Ω – 10Ω*
10Ω – 3.01K
SMX 3
3W
500
±200 ppm/°C
–
3.01K – 118K
3.01K – 470K
Type
* Zero ohm available on all sizes .
Mechanical Specifications
Type
Tolerance
SM 1
SM/ SMX 2
SM 2A
SM/ SMX 3
A
Body Length
B
Total Length
C
Body Height
D
Body Width
±0.015
±0.4
0.260
6.6
0.410
10.4
0.475
12.1
0.629
16.0
±0.032
±0.81
0.280
7.1
0.435
11.1
0.500
12.7
0.708
18.0
±0.015
±0.4
0.140
3.6
0.180
4.6
0.140
3.6
0.256
6.5
E
F
Termination Width Termination Length Units
±0.015
±0.4
0.150
3.8
0.240
6.1
0.305
7.8
0.276
7.0
±0.015
±0.4
0.090
2.3
0.100
2.5
0.110
2.8
0.110
2.8
±0.015
±0.4
0.100
2.5
0.115
2.9
0.115
2.9
0.115
2.9
inches
mm
inches
mm
inches
mm
inches
mm
How to Order
SM
2
1K
1%
R
SEI Type
Code
Nominal Resistance
Tolerance
Packaging
Type
Element
Code
Size
Tolerance
Series
Code
Description
Pkg Qty
SM
Wirewound
1
2815
0.1%
SM 1
R
13" Reel
1,500
SMX
Metal Oxide
2
4424
0.5%
SM 2, SMX 2
R
13" Reel
800
2A
5031
1%
SM 2A
R
13" Reel
1,200
3
7128
5%
SM 3, SMX 3
R
13" Reel
750
Toll Free: (888) SEI-SEIS
(888) 734-7347
www.seielect.com
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email: marketing@seielect.com