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
HISTORICAL
MODEL
POWER RATING
P70 °C
W
RESISTANCE
RANGE
TOLERANCE
±%
WEIGHT (TYPICAL)
g/1000 PIECES
SM-1
SM1
0.5
0.1 to 400
0.1, 0.25, 0.5, 1, 5
45
SM-2
SM2
1
0.1 to 3K
0.1, 0.25, 0.5, 1, 5
230
SM-3
SM3
3
0.1 to 25K
0.1, 0.25, 0.5, 1, 5
1360
SM-4
SM4
2
0.1 to 15K
0.1, 0.25, 0.5, 1, 5
680
SM-5
SM5
4
0.1 to 50K
0.1, 0.25, 0.5, 1, 5
2040
GLOBAL
MODEL
TECHNICAL SPECIFICATIONS
PARAMETER
Temperature Coefficient
UNIT
SM RESISTOR CHARACTERISTICS
ppm/°C
± 20 > 10 , ± 50 1 to 10 , contact factory for 0.99 and below
Dielectric Withstanding Voltage
VAC
1000
Operating Temperature Range
°C
-55 to +275
Maximum Working Voltage
V
(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
4
0
0
0
F
E
6
GLOBAL MODEL
(4 digits)
VALUE
(5 digits)
TOLERANCE
(1 digit)
PACKAGING CODE
(2 digits)
SPECIAL
(up to 3 digits)
SM-1
SM-2
SM-3
SM-4
SM-5
R = Decimal
K = Thousand
1R500 = 1.5
4K000 = 4 k
B = ± 0.1 %
C= ± 0.25 %
D = ± 0.5 %
F=±1%
J = ± 5%
E6 = lead (Pb)-free,
7" tape and reel pack
E7 = lead (Pb)-free,
13" tape and reel pack
(Dash Number)
From 1 to 999
as applicable
NI = Non-inductive
Historical Part Number example: SM2-0.4-1%
SM2
0.4
1%
HISTORICAL MODEL
RESISTANCE VALUE
TOLERANCE
Revision: 06-Apr-18
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
Vishay Huntington
DIMENSIONS in inches [millimeters]
T
L
c
+
H
GLOBAL
MODEL
SM-1
W
b
a
W1
DIMENSIONS in inches [millimeters]
SOLDER PAD DIMENSIONS
L ± 0.015
[0.381]
W ± 0.015
[0.381]
H ± 0.015
[0.381]
W1 ± 0.015
[0.381]
T ± 0.015
[0.381]
a ± 0.015
[0.381]
b ± 0.015
[0.381]
c ± 0.015
[0.381]
0.190 [4.83]
0.130 [3.30]
0.110 [2.79]
0.060 [1.52]
0.040 [1.02]
0.062 [1.57]
0.100 [2.54]
0.250 [6.35]
SM-2
0.260 [6.60]
0.155 [3.94]
0.125 [3.18]
0.070 [1.78]
0.070 [1.78]
0.096 [2.44]
0.112 [2.84]
0.337 [8.56]
SM-3
0.625 [15.88]
0.270 [6.86]
0.250 [6.35]
0.120 [3.05]
0.135 [3.43]
0.200 [5.08]
0.150 [3.81]
0.700 [17.78]
SM-4
0.450 [11.43]
0.250 [6.35]
0.180 [4.57]
0.120 [3.05]
0.100 [2.54]
0.155 [3.94]
0.230 [5.84]
0.540 [13.72]
SM-5
0.820 [20.83]
0.295 [7.49]
0.305 [7.75]
0.150 [3.81]
0.190 [4.83]
0.220 [5.59]
0.250 [6.35]
0.900 [22.86]
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
RATED POWER IN %
DERATING
MATERIAL SPECIFICATIONS
120
100
80
60
40
20
0
- 55
0
50
100
70
150
200
250
300
350
AMBIENT TEMPERATURE IN °C
PERFORMANCE
TEST
CONDITIONS OF TEST
TEST LIMITS
± 0.5 % + 0.05
Thermal Shock
-55 °C to +150 °C, 1000 cycles, 15 min at each extreme
Short Time Overload
5x rated power for 5 s
± 0.5 % + 0.05
Low Temperature Storage
-55 °C for 24 h
± 0.5 % + 0.05
Load Life
1000 h at rated power, +70 °C, 1.5 h “ON”, 0.5 h “OFF”
± 1.0 % + 0.05
Resistance to Solder Heat
MIL-STD 202; 260 °C, 10 s
± 0.5 % + 0.05
Moisture Resistance
Per MIL-STD 202
± 1.0 % + 0.05
PACKAGING
MODEL
SM-1
SM-2
SM-3
SM-4
SM-5
Revision: 06-Apr-18
REEL
TAPE WIDTH
12 mm/embossed plastic
16 mm/embossed plastic
24 mm/embossed plastic
24 mm/embossed plastic
32 mm/embossed plastic
DIAMETER
PIECES/REEL
PACKAGE CODE
178 mm/7"
650
E6
330 mm/13"
3000
E7
178 mm/7"
600
E6
330 mm/13"
2000
E7
178 mm/7"
125
E6
330 mm/13"
500
E7
178 mm/7"
250
E6
330 mm/13"
1000
E7
178 mm/7"
180
E6
330 mm/13"
500
E7
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
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Vishay
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Revision: 09-Jul-2021
1
Document Number: 91000