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
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
POWER RATING
(Max. Hot Spot)
*Maximum working voltage determined at .0008" [.020mm] diameter wire resistance values.
Note: Shaded areas indicate most popular models.
MECHANICAL SPECIFICATIONS
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®.
ELECTRICAL 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.
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
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
MEMO TO DIV:
PLEASE FILL IN
MISSING INFO
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
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
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]
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
ENVIRONMENTAL PERFORMANCE *
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]
DERATING
TEST
Temperature Coefficient
Thermal Shock
Short Time Overload
Dielectric
Low Temperature Storage
High Temperature Exposure
Moisture Resistance
Shock
Vibration
Load Life
Terminal Strength
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
*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.
B
(Max.)
.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]
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]
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]
D
C
1.50 [38.10]
Min. A
B
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.
PART MARKING
120
100
80
60
40
20
0
% OF RATED POWER
25 75 125 175 225 275 325 375
AMBIENT TEMP. DEG. CENTIGRADE
CHAR. V
CHAR. U
HOW TO ORDER
— Dale
— Model
— Value
— Tolerance
— Date code
CW-5
MODEL ± 5%
TOLERANCE
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.
3
STYLE 3k
RESISTANCE
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
