Rev Date: 02/02/2010 75 www.seielect.com
This specification may be changed at any time without prior notice marketing@seielect.com
Please confirm technical specifications before you order and/or use.
SM Series
Surface Mount Wirewound Resistors Stackpole Electronics, Inc.
Resistive Product Solutions
Features: • High temperature molded encapsulation
• Flex termination for absorbing thermal expansion
• All welded construction
• Non-inductive types available as NSM
• RoHS compliant / lead-free
Maximum Dielectric
T
y
pe / Code Workin
g
Withstandin
g
Voltage Voltage 0.1%, 0.5%, 1%, 5%
0.01 - 10(*)
10.2 - 1K
0.01 - 10(*)
10.2 - 2K
SM 2A 2W 60V >500V ±75 ppm/ºC 0.01 - 0.06(*)
SM 3A 3W 60V >500V ±75 ppm/ºC 0.01 - 0.06(*)
0.01 - 10(*)
10.2 - 3.01K
0.01 - 10(*)
10.2 - 5K
(*) Zero ohm available on all sizes
SM 4 4W 100V ±100 ppm/ºC ± 20 ppm/ºC>500V
±100 ppm/ºC ± 20 ppm/ºC
SM 3 3W 100V ±100 ppm/ºC ± 20 ppm/ºC>500V
>500VSM 2 2W 50V
Power Rating
(Watts) @ 70ºC Resistance Temperature Coefficient Ohmic Range(Ω) and Tolerance
SM 1 1W 25V ±100 ppm/ºC ± 20 ppm/ºC>500V
Electrical Specifications
Ambient Temperature (ºC)
150 200 250 300
25
050 100
Power Derating Curve
100
75
50
Percent Rated Power (%)
275
25 70
Nominal
Resistance Tolerance
1K 1%
T
y
pe Description Code Size Tolerance T
y
pes Qt
y
Description Code
SM Standard 1 2815 0.1% SM 1 1,500
NSM Non-inductive 24324 0.5% SM 2 800
2A 4827 1% SM 2A 1,200
3A 4827 5% SM 3, 3A 750
36528 SM4 350
48035
13" Reel R
SEI Type Code Packaging
SM 2 R
How to Order
Rev Date: 02/02/2010 76 www.seielect.com
This specification may be changed at any time without prior notice marketing@seielect.com
Please confirm technical specifications before you order and/or use.
SM Series
Surface Mount Wirewound Resistors Stackpole Electronics, Inc.
Resistive Product Solutions
ABCDEF
Body Total Body Body Termination Termination
Length Length Height Width Width Length
0.26 ± 0.015 0.28 ± 0.032 0.14 ± 0.015 0.15 ± 0.015 0.1 ± 0.015 0.09 ± 0.015 0.138 0.13 0.35 inches
6.6 ± 0.4 7.1 ± 0.81 3.6 ± 0.4 3.8 ± 0.4 2.5 ± 0.4 2.3 ± 0.4 3.5 3.3 8.9 mm
0.41 ± 0.015 0.43 ± 0.032 0.18 ± 0.015 0.24 ± 0.015 0.122 ± 0.015 0.09 ± 0.015 0.181 0.157 0.583 inches
10.4 ± 0.4 10.9 ± 0.81 4.6 ± 0.4 6.1 ± 0.4 3.1 ± 0.4 2.3 ± 0.4 4.6 4 14.8 mm
0.455 ± 0.015 0.475 ± 0.032 0.15 ± 0.015 0.27 ± 0.015 0.122 ± 0.015 0.105 ± 0.015 0.169 0.157 0.587 inches
11.6 ± 0.4 12.1 ± 0.81 3.8 ± 0.4 6.9 ± 0.4 3.1 ± 0.4 2.7 ± 0.4 4.3 4 14.9 mm
0.455 ± 0.015 0.475 ± 0.032 0.15 ± 0.015 0.27 ± 0.015 0.122 ± 0.015 0.105 ± 0.015 0.169 0.157 0.587 inches
11.6 ± 0.4 12.1 ± 0.81 3.8 ± 0.4 6.9 ± 0.4 3.1 ± 0.4 2.7 ± 0.4 4.3 4 14.9 mm
0.625 ± 0.015 0.645 ± 0.032 0.25 ± 0.015 0.275 ± 0.015 0.122 ± 0.015 0.13 ± 0.015 0.236 0.165 0.85 inches
15.9 ± 0.4 16.4 ± 0.81 6.4 ± 0.4 7 ± 0.4 3.1 ± 0.4 3.3 ± 0.4 6.2 4.2 21.6 mm
0.8 ± 0.015 0.825 ± 0.032 0.362 ± 0.015 0.35 ± 0.015 0.24 ± 0.015 0.123 ± 0.015 0.34 0.19 0.95 inches
20.3 ± 0.4 21 ± 0.81 9.2 ± 0.4 8.9 ± 0.4 6.1 ± 0.4 3.1 ± 0.4 8.6 4.8 24.1 mm
SM 3
SM 4
SM 3A
SM 2A
Type / Code Units
SM 1
SM 2
WH L
Mechanical Specifications
Test Results
Moisture Resistance ±1%
Thermal Shock ±0.5%
Load Life @ 70ºC - 1,000 hrs. ±1%
Shock and Vibration ±1%
Resistance to Soldering Heat ±1
Terminal Strength ±0.5%
Dielectric Withstanding Voltage ±0.001% / V
Short Time Overload ±0.2%
Low Temperature Operation ±0.5%
perating Temperature Range: -55ºC to +275ºC
Performance Characteristics
O
