PRODUCT BULLETIN
WW-SERIES
FLAMEPROOF WIREWOUND RESISTORS
1 TO 10 WATT
0.1% THRU 10% TOLERANCE
SILICONE COATED
HIGH PURITY CERAMIC CORE
STAINLESS STEEL END CAPS
TINNED COPPER-CLAD STEEL LEADS
WELDED CONSTRUCTION
PACKAGED TAPE & REEL OR BULK
AVAILABLE IN NON-INDUCTIVE STYLE
MEETS REQUIREMENTS FOR MIL-R-26
1.375" Min.
WILLOW TECHNOLOGIES LTD.
SHAWLANDS COURT, NEWCHAPEL ROAD
LINGFIELD, SURREY, RH7 6BL, ENGLAND
Tel. + 44 (0) 1342 835234 Fax. + 44 (0) 1342 834306
E-mail
rob@willow.co.uk
Website
http://www.willow.co.uk
Specifications
PRP
Style
WW1/2
WW1
WW2
WW3
WW4
WW5
WW7
WW10
Wattage
U
.75
1.0
2.0
3.0
4.0
5.0
7.0
10.0
V
1.0
1.5
2.6
3.6
5.0
6.5
8.0
11.0
Resistance
Range
0.1
0.1
.02
.01
0.1
.01
0.1
0.1
to 5.23K
to 5.0K
to 7.2K
to 9.5K
to 14.0K
to 42.0K
to 63.0K
to 92.0K
Voltage
U
32
44
65
130
210
360
490
632
V
44
54
77
147
250
410
530
700
L
D
d
Dimensions
PRP
Style
WW1/2
WW1
WW2
WW3
WW4
WW5
WW7
WW10
DIMENSIONS Inches
L
.266 ± .015
.400 ± .030
.460 ± .030
.490 ± .030
.550 ± .030
.910 ± .030
1.250 ± .060
1.750 ± .060
Dimensional
Correlation
D
.095 ± .015
.100 ± .030
.175 ± .030
.210 ± .030
.220 ± .030
.295 ± .030
.295 ± .030
.295 ± .030
Lead Dia. (d)
.025 *
.025 *
.032
.032
.032
.032
.032
.032
in.
.015
.020
.025
.030
.032
.060
.095
.100
.175
.210
.220
.266
.295
.400
.460
.490
.550
.910
1.25
1.75
mm
0.38
0.5
0.64
0.76
0.81
1.52
2.41
2.54
4.45
5.33
5.59
6.76
7.49
10.2
11.7
12.4
14.0
23.1
31.8
44.5
* ALSO AVAILABLE IN .020
Temperature
TC20 = ±20PPM/°C, 10 ohm and above.
TC50 = ±50PPM/°C, 1 ohm - 9.9 ohm.
TC90 = ±90PPM/°C, below 1 ohm.
How to Order
Sample Part Number
WW1 TC20
7.5K
±1% S
Options
N = Non-Inductive
Resistance Tolerance
Resistance Value
Temperature Coefficient
Type
DEDICATION TO EXCELLENCE
Subject to change without notice
Continued on reverse side
S = Standard
ENVIRONMENTAL
SPECIFICATIONS
LOAD LIFE
MOISTURE RESISTANCE
THERMAL SHOCK
SHORT TIME OVERLOAD
DIELECTRIC STRENGTH
LOW TEMP. STORAGE
HIGH TEMP. EXPOSURE
TERMINAL STRENGTH
SHOCK
VIBRATION
CHARACTERISTIC
U
± .5% + .05
Ω
± .2% + .05
Ω
± .2% + .05
Ω
± .2% + .05
Ω
± .1% + .05
Ω
± .2% + .05
Ω
± .5% + .05
Ω
± .1% + .05
Ω
± .1% + .05
Ω
± .1% + .05
Ω
V
± 3.0% + .05
Ω
± .2% + .05
Ω
± .2% + .05
Ω
± .5% + .05
Ω
± .1% + .05
Ω
± .2% + .05
Ω
± .5% + .05
Ω
± .1% + .05
Ω
± .1% + .05
Ω
± .1% + .05
Ω
Derating Curve
100
80
LOAD %
60
CHAR. U
CHAR. V
40
20
0
25
50
75
100
125
150
175
200
225
250
275
300
325
350
AMBIENT TEMP (°C)
WW Series resistors have an operating
temperature of -55°C to +350°C.
They must be derated for use at high
ambient temperatures as shown above.
Resistors with characteristic V are available
in 3%, 5% and 10% only.
Subject to change without notice