UW

UW Series
Ceramic Wirewound Resistors
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Resistances from 0.01 to 91kOhms
Tolerance to ±0.01%
Low Temperature Coefficient
Power Rating to 15Watts
All Welded Resistance Element
Non-Inductive Windings are Available
Flameproof Inorganic Construction
SPECIFICATIONS
L
H
HS
W
d2
Type
Power Rating
W @ 70°C
Resistance1
Range
±0.04 [±1.0]
±0.04 [±1.0]
±0.04 [±1.0]
±0.015 [±0.4]
±0.015 [±0.4]
UW-2
2
0.01 to 22k
0.700 [17.8]
0.245 [6.2]
0.300 [7.6]
0.255 [6.5]
0.032 [0.8]
UW-3
3
0.01 to 22k
0.875 [22.2]
0.312 [7.9]
0.375 [9.5]
0.312 [7.9]
0.032 [0.8]
UW-5
5
0.01 to 45k
0.875 [22.2]
0.375 [9.5]
0.437 [11.1]
0.375 [9.5]
0.032 [0.8]
UW-10
10
0.01 to 65k
1.875 [48]
0.375 [9.5]
0.500 [12.7]
0.375 [9.5]
0.040 [1.0]
UW-15
15
0.01 to 91k
1.875 [48]
0.500 [12.7]
0.625 [15.9]
0.500 [12.7]
0.040 [1.0]
1
2
For non-inductive windings / divide maximum resistance by 2
Lead Diameter: 18 AWG = 0.040” / 20 AWG = 0.032”
Ordering Information
For Non-Inductive Windings / insert the letter “N” ( i.e. UWN-5 )
Part Number - Resistance - Tolerance - TCR ( If not standard )
Example: UW-5 100 Ohm 1%
Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, United Kingdom.
http://www.willow.co.uk
+ 44 (0) 1342 835234 + 44 (0) 1342 834306 [email protected]
rev. 03/2006A
UW Series
Ceramic Wirewound Resistors
SPECIFICATIONS (continued)
Specification
Value
Tolerances
±0.01% to ±10% ( 1% Standard )
Temperature Coefficient
>10W : ±20ppm/K
1W to10W : ±50ppm/K
<1W : Call Factory
Temperature Range
-55°C to +275°C
Dielectric Strength
1500 VAC
Constuction
Centerless ground ceramic core
Tinned copper or copperweld leads
High temperature / inorganic potting compound
All welded terminations
Environmental Performance
DR
Dielectric
±0.2% + 0.05W
Load Life
±1% + 0.05W
Storage
±0.2% + 0.05W
Moisture Resistance
±0.2% + 0.05W
Thermal Shock
±0.2% + 0.05W
5X Overload ( 5s )
±0.2% + 0.05W
Shock
±0.1% + 0.05W
Vibration
±0.1% + 0.05W
(MIL-STD 202)
Power Derating Curve
120
Power ( % )
100
80
60
40
20
0
0
50
100
150
200
250
300
350
Ambient Temperature (°C)
Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, United Kingdom.
http://www.willow.co.uk
+ 44 (0) 1342 835234 + 44 (0) 1342 834306 [email protected]
rev. 03/2006A