WW Series

PRODUCT BULLETIN
WILLOW TECHNOLOGIES LTD.
SHAWLANDS COURT, NEWCHAPEL ROAD
LINGFIELD, SURREY, RH7 6BL, ENGLAND
Tel. + 44 (0) 1342 835234 Fax. + 44 (0) 1342 834306
E-mail [email protected]
Website http://www.willow.co.uk
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.
Specifications
PRP
Style
U
V
WW1/2
.75
1.0
0.1
WW1
1.0
1.5
WW2
2.0
WW3
Wattage
Voltage
Resistance
Range
U
V
to 5.23K
32
44
0.1
to 5.0K
44
54
2.6
.02
to 7.2K
65
77
3.0
3.6
.01
to 9.5K
130
147
WW4
4.0
5.0
0.1
to 14.0K
210
250
WW5
5.0
6.5
.01
to 42.0K
360
410
WW7
7.0
8.0
0.1
to 63.0K
490
530
10.0
11.0
0.1
to 92.0K
632
700
WW10
L
D
Dimensional
Correlation
d
Dimensions
DIMENSIONS Inches
PRP
Style
L
D
WW1/2
.266 ± .015
.095 ± .015
.025 *
WW1
.400 ± .030
.100 ± .030
.025 *
.460 ± .030
.175 ± .030
.032
Lead Dia. (d)
in.
mm
WW2
.015
.020
.025
.030
.032
.060
.095
0.38
0.5
0.64
0.76
0.81
1.52
2.41
WW3
.490 ± .030
.210 ± .030
.032
WW4
.550 ± .030
.220 ± .030
.032
WW5
.910 ± .030
.295 ± .030
.032
WW7
1.250 ± .060
.295 ± .030
.032
WW10
1.750 ± .060
.295 ± .030
.032
.100
.175
.210
.220
.266
.295
.400
.460
.490
.550
.910
1.25
1.75
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
S = Standard
Options N = Non-Inductive
Resistance Tolerance
Resistance Value
Temperature Coefficient
Type
DEDICATION TO EXCELLENCE
Subject to change without notice
Continued on reverse side
ENVIRONMENTAL
SPECIFICATIONS
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
LOAD LIFE
MOISTURE RESISTANCE
THERMAL SHOCK
SHORT TIME OVERLOAD
DIELECTRIC STRENGTH
LOW TEMP. STORAGE
HIGH TEMP. EXPOSURE
TERMINAL STRENGTH
SHOCK
VIBRATION
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
LOAD %
80
CHAR. V
60
CHAR. U
40
20
0
25
50
75
100
125
150
175
200
225
250
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
275
300
325
350