SM
www.vishay.com
Vishay Huntington
Wirewound Resistors, Precision Power, Surface Mount
FEATURES
• All welded construction
• Molded encapsulation
• Wraparound terminations
• Excellent stability at different environmental
conditions
• High power ratings (up to 4 W)
• Available in non-inductive styles (“NI”
SPECIAL)
with
Ayrton-Perry
winding
(Resistance max. value is one half standard
value)
• Material categorization: for definitions of compliance
please see
www.vishay.com/doc?99912
STANDARD ELECTRICAL SPECIFICATIONS
GLOBAL
MODEL
SM-1
SM-2
SM-3
SM-4
SM-5
HISTORICAL
MODEL
SM1
SM2
SM3
SM4
SM5
POWER RATING
P
70 °C
W
0.5
1
3
2
4
RESISTANCE
RANGE
0.1 to 400
0.1 to 3K
0.1 to 25K
0.1 to 15K
0.1 to 50K
TOLERANCE
±%
0.1, 0.25, 0.5, 1, 5
0.1, 0.25, 0.5, 1, 5
0.1, 0.25, 0.5, 1, 5
0.1, 0.25, 0.5, 1, 5
0.1, 0.25, 0.5, 1, 5
WEIGHT (TYPICAL)
g/1000 PIECES
45
230
1360
680
2040
TECHNICAL SPECIFICATIONS
PARAMETER
Temperature Coefficient
Dielectric Withstanding Voltage
Operating Temperature Range
Maximum Working Voltage
UNIT
ppm/°C
V
AC
°C
V
SM RESISTOR CHARACTERISTICS
± 20 > 10
,
± 50 1
to 10
,
contact factory for 0.99
and below
1000
-55 to +275
(P x
R)
1/2
GLOBAL PART NUMBER INFORMATION
Global Part Numbering example: SM-2R4000FE6
(visit
www.vishay.net
SAP parts manual for all options)
S
M
-
2
R
VALUE
(5 digits)
R
= Decimal
K
= Thousand
1R500
= 1.5
4K000
= 4 k
4
0
0
0
F
E
6
SPECIAL
(up to 3 digits)
(Dash Number)
From
1
to
999
as applicable
NI
= Non-inductive
GLOBAL MODEL
(4 digits)
SM-1
SM-2
SM-3
SM-4
SM-5
TOLERANCE
(1 digit)
B
= ± 0.1 %
C=
± 0.25 %
D
= ± 0.5 %
F
=±1%
J
= ± 5%
PACKAGING CODE
(2 digits)
E6
= lead (Pb)-free,
7" tape and reel pack
E7
= lead (Pb)-free,
13" tape and reel pack
Historical Part Number example: SM2-0.4-1%
SM2
HISTORICAL MODEL
0.4
RESISTANCE VALUE
1%
TOLERANCE
Revision: 04-Oct-17
Document Number: 31812
1
For technical questions, contact:
ww2bresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
SM
www.vishay.com
DIMENSIONS
in inches [millimeters]
L
T
c
Vishay Huntington
+
W
b
H
W1
a
GLOBAL
MODEL
SM-1
SM-2
SM-3
SM-4
SM-5
DIMENSIONS
in inches [millimeters]
L ± 0.015
[0.381]
0.190 [4.83]
0.260 [6.60]
0.625 [15.88]
0.450 [11.43]
0.820 [20.83]
W ± 0.015
[0.381]
0.130 [3.30]
0.155 [3.94]
0.270 [6.86]
0.250 [6.35]
0.295 [7.49]
H ± 0.015
[0.381]
0.110 [2.79]
0.125 [3.18]
0.250 [6.35]
0.180 [4.57]
0.305 [7.75]
W1 ± 0.015
[0.381]
0.060 [1.52]
0.070 [1.78]
0.120 [3.05]
0.120 [3.05]
0.150 [3.81]
T ± 0.015
[0.381]
0.040 [1.02]
0.070 [1.78]
0.135 [3.43]
0.100 [2.54]
0.190 [4.83]
SOLDER PAD DIMENSIONS
a ± 0.015
[0.381]
0.062 [1.57]
0.096 [2.44]
0.200 [5.08]
0.155 [3.94]
0.220 [5.59]
b ± 0.015
[0.381]
0.100 [2.54]
0.112 [2.84]
0.150 [3.81]
0.230 [5.84]
0.250 [6.35]
c ± 0.015
[0.381]
0.250 [6.35]
0.337 [8.56]
0.700 [17.78]
0.540 [13.72]
0.900 [22.86]
MATERIAL SPECIFICATIONS
Element:
copper-nickel alloy
Encapsulation:
molded epoxy
Core:
ceramic
Terminal:
matte tin
Part Marking:
HEI, model, value, tolerance, date code
Note
• Due to resistor size limitations some resistors will have minimal
information marked on parts
DERATING
RATED POWER IN %
120
100
80
60
40
20
0
- 55
0
50
70
100
150
200
250
300
350
AMBIENT TEMPERATURE IN °C
PERFORMANCE
TEST
Thermal Shock
Short Time Overload
Low Temperature Storage
Load Life
5x rated power for 5 s
-55 °C for 24 h
1000 h at rated power, +70 °C, 1.5 h “ON”, 0.5 h “OFF”
CONDITIONS OF TEST
-55 °C to +150 °C, 1000 cycles, 15 min at each extreme
TEST LIMITS
± 0.5 % + 0.05
± 0.5 % + 0.05
± 0.5 % + 0.05
± 1.0 % + 0.05
PACKAGING
MODEL
SM-1
SM-2
SM-3
SM-4
SM-5
REEL
TAPE WIDTH
12 mm/embossed plastic
16 mm/embossed plastic
24 mm/embossed plastic
24 mm/embossed plastic
32 mm/embossed plastic
DIAMETER
178 mm/7"
330 mm/13"
178 mm/7"
330 mm/13"
178 mm/7"
330 mm/13"
178 mm/7"
330 mm/13"
178 mm/7"
330 mm/13"
PIECES/REEL
650
3000
600
2000
125
500
250
1000
180
500
PACKAGE CODE
E6
E7
E6
E7
E6
E7
E6
E7
E6
E7
Revision: 04-Oct-17
Document Number: 31812
2
For technical questions, contact:
ww2bresistors@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
Legal Disclaimer Notice
www.vishay.com
Vishay
Disclaimer
ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE
RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively,
“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other
disclosure relating to any product.
Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or
the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all
liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special,
consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular
purpose, non-infringement and merchantability.
Statements regarding the suitability of products for certain types of applications are based on Vishay’s knowledge of
typical requirements that are often placed on Vishay products in generic applications. Such statements are not binding
statements about the suitability of products for a particular application. It is the customer’s responsibility to validate that a
particular product with the properties described in the product specification is suitable for use in a particular application.
Parameters provided in datasheets and / or specifications may vary in different applications and performance may vary over
time. All operating parameters, including typical parameters, must be validated for each customer application by the customer’s
technical experts. Product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase,
including but not limited to the warranty expressed therein.
Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining
applications or for any other application in which the failure of the Vishay product could result in personal injury or death.
Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk.
Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for
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No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document
or by any conduct of Vishay. Product names and markings noted herein may be trademarks of their respective owners.
© 2017 VISHAY INTERTECHNOLOGY, INC. ALL RIGHTS RESERVED
Revision: 08-Feb-17
1
Document Number: 91000
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