MODEL CW
Wirewound Resistors
Commercial Coated
FEATURES
•
High performance for low cost
•
High temperature silicone coating
•
Complete welded construction
•
Excellent stability in operation
•
High power/size ratio
STANDARD ELECTRICAL SPECIFICATIONS
POWER RATING
(Max. Hot Spot)
MODEL
CW-1/2
CW-1
CW-1M
CW-2
CW-2M
CW-2B
CW-2C
CW-2C-14
CW-5
CW-5-2
CW-5-3
CW-7
CW-10
CW-10-3
Characteristic U
+ 275
°
C
.5 W
1.0 W
1.0 W
4.0 W
3.0 W
3.0 W
2.5 W
2.5 W
5.0 W
4.0 W
5.0 W
7.0 W
10.0 W
10.0 W
Characteristic V
+ 350
°
C
—
—
—
5.5 W
3.75 W
3.75 W
3.25 W
3.25 W
6.5 W
5.0 W
6.5 W
9.0 W
13.0 W
13.0 W
RESISTANCE
RANGE
(Ohms)
0.1 - 1.54k
0.1 - 5.50k
0.1 - 3.30k
0.1 - 28.7k
0.1 - 8.38k
0.1 - 15k
0.1 - 19.9k
0.1 - 19.9k
0.1 - 58.5k
0.1 - 40.3k
0.1 - 58.5k
0.1 - 95.2k
0.1 - 167k
0.1 - 167k
MAXIMUM
WEIGHT
(Grams)
.21
.34
.30
2.1
.65
.70
1.6
1.6
4.2
4.2
4.2
4.7
9.0
9.0
MAXIMUM*
WORKING VOLTAGE
Characteristic U
+ 275
°
C
19.6 V
45.9 V
37.4 V
200.0 V
83.0 V
125.0 V
130.0 V
130.0 V
320.0 V
240.0 V
320.0 V
460.0 V
765.0 V
765.0 V
Characteristic V
+ 350
°
C
—
—
—
235.0 V
116.0 V
140.0 V
150.0 V
150.0 V
365.0 V
265.0 V
365.0 V
520.0 V
875.0 V
875.0 V
MEMO TO DIV:
PLEASE FILL IN
MISSING INFO
*Maximum working voltage determined at .0008" [.020mm] diameter wire resistance values.
Note:
Shaded areas indicate most popular models.
ELECTRICAL SPECIFICATIONS
MECHANICAL SPECIFICATIONS
Resistance Tolerance:
±
5% standard 1 ohm and above.
±
10% standard below 1 ohm.
±
3% available.
Temperature Coefficient:
(- 55°C to + 350°C).
±
90PPM/°C below 1 ohm.
±
50PPM/°C 1 ohm to 9.9 ohm.
±
30PPM/°C 10 ohm and above.
Short Time Overload:
5 seconds at 5 times rated power for
3.75 watt size and smaller. 5 seconds at 10 times rated
power for 4 watt size and larger.
Dielectric Strength:
1000 VAC minimum.
Terminal Strength:
10 pound pull test.
Solderability:
60/40 electro tin plated terminals to
facilitate soldering.
MATERIAL SPECIFICATIONS
Core:
Ceramic: Steatite or alumina, depending on
physical size.
Element:
Copper-nickel alloy or nickel-chrome alloy,
depending on resistance value.
End Caps:
Stainless steel.
Coating:
Special high temperature silicone.
Standard Terminals:
Tinned Copperweld
®
.
Vishay Dale
1122 23rd Street, Columbus, NE 68601-3647 •
Phone
(402) 563-6506 •
Fax
402-563-6418 •
Internet
www.vishay.com
Major Vishay Brands
Dale • Draloric • Foil Resistors • Measurements Group • Roederstein • Sfernice • Sprague • Thin Film • Vitramon
MODEL CW
DIMENSIONAL CONFIGURATIONS
[Numbers in brackets indicate millimeters]
1.50 [38.10]
Min.
A
B
D
C
B
MODEL
CW-1/2
CW-1
CW-1M
CW-2
CW-2M
CW-2B
CW-2C
CW-2C-14
CW-5
CW-5-2
CW-5-3
CW-7
CW-10
CW-10-3
A
.250
±
.031
[6.35
±
.787]
.406
±
.031
[10.31
±
.787]
.285
±
.025
[7.24
±
.635]
.625
±
.062
[15.87
±
1.57]
.500
±
.062
[12.70
±
1.57]
.562
±
.062
[14.27
±
1.57]
.500
±
.062
[12.70
±
1.57]
.500
±
.062
[12.70
±
1.57]
.875
±
.062
[22.22
±
1.57]
.875
±
.062
[22.22
±
1.57]
.875
±
.062
[22.22
±
1.57]
1.218
±
.062
[30.94
±
1.57]
1.781
±
.062
[45.24
±
1.57]
1.781
±
.062
[45.24
±
1.57]
(Max.)
C
.085
±
.020
[2.16
±
.508]
.094
±
.031
[2.39
±
.787]
.110
±
.015
[2.79
±
.381]
.250
±
.032
[6.35
±
.813]
.185
±
.015
[4.70
±
.381]
.188
±
.032
[4.78
±
.813]
.218
±
.032
[5.54
±
.813]
.218
±
.032
[5.54
±
.813]
.312
±
.032
[7.92
±
.813]
.250
±
.032
[6.35
±
.813]
.312
±
.032
[7.92
±
.813]
.312
±
.032
[7.92
±
.813]
.375
±
.032
[9.52
±
.813]
.375
±
.032
[9.52
±
.813]
D
.020
±
.002]
[.508
±
.051]
.020
±
.002
[.508
±
.051]
.020
±
.002
[.508
±
.051]
.040
±
.002
[1.02
±
.051]
.032
±
.002
[.813
±
.051]
.032
±
.002
[.813
±
.051]
.040
±
.002
[1.02
±
.051]
.032
±
.002
[.813
±
.051]
.040
±
.002
[1.02
±
.051]
.032
±
.002
[.813
±
.051]
.032
±
.002
[.813
±
.051]
.040
±
.002
[1.02
±
.051]
.040
±
.002
[1.02
±
.051]
.032
±
.002
[.813
±
.051]
.281
[ 7.14]
.437
[11.10]
.311
[7.90]
.765
[19.43]
.562
[14.27]
.622
[15.80]
.593
[15.06]
.593
[15.06]
1.0
[25.40]
1.0
[25.40]
1.0
[25.40]
1.281
[32.54]
1.875
[47.62]
1.875
[47.62]
ENVIRONMENTAL PERFORMANCE *
TEST
Temperature Coefficient
DALE MAXIMUM
±
90PPM/°C below 1Ω
±
50PPM/°C 1Ω to 9.9Ω
±
30PPM/°C 10Ω and above
±
(2% + .05Ω)
∆R
±
(2% + .05Ω)
∆R
±
(.1% + .05Ω)
∆R
±
(2% + .05Ω)
∆R
±
(4% + .05Ω)
∆R
±
(2% + .05Ω)
∆R
±
(.2% + .05Ω)
∆R
±
(.2% + .05Ω)
∆R
±
(3% + .05%)
∆R
±
(1% + .05Ω)
∆R
DERATING
% OF RATED POWER
120
100
80
60
40
20
0
25
75
125
175
225
275
325
AMBIENT TEMP. DEG. CENTIGRADE
375
CHAR. U
CHAR. V
Thermal Shock
Short Time Overload
Dielectric
Low Temperature Storage
High Temperature Exposure
Moisture Resistance
Shock
Vibration
Load Life
Terminal Strength
POWER RATING
Dale
®
CW Models have two power ratings, depending on operating
temperature and stability requirements.
CHARACTERISTIC U:
1. + 275°C maximum hot spot temperature.
2. .5% maximum
∆R
in 2000 hour load life.
CHARACTERISTIC V:
1. + 350°C maximum hot spot temperature.
2. 3% maximum
∆R
in 2000 hour load life.
PACKAGING
See Packaging Methods - Wirewound
Resistors at the back of the catalog.
Some standard reel pack methods trim
the leads to a shorter length than shown
in the Dimensional Outline.
*
All
∆R
figures shown are maximum, based upon testing requirements per
MIL-R-26 at a maximum operating temperature of + 350°C.
∆R
maximum
figures are considerably lower when tested at a maximum operating
temperature of + 275°C.
PART MARKING
— Dale
— Model
— Value
— Tolerance
— Date code
HOW TO ORDER
CW-5
MODEL
3
STYLE
3k
RESISTANCE
±
5%
TOLERANCE
Vishay Dale
1122 23rd Street, Columbus, NE 68601-3647 •
Phone
(402) 563-6506 •
Fax
402-563-6418 •
Internet
www.vishay.com
Major Vishay Brands
Dale • Draloric • Foil Resistors • Measurements Group • Roederstein • Sfernice • Sprague • Thin Film • Vitramon
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