UT Series
Silicone Coated Power Resistors
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Resistances from 0.005 to 260kOhms
Power Rating 0.1 to 13Watts
Resistance Tolerances to ± 0.01%
Low TCR: ± 20ppm/K Standard
MIL-R-26 / MIL-R-39007 Power Ratings
Temperature Range: -55°C to +350°C ( “V” Rating )
Non-Inductive Windings Available
SPECIFICATIONS
Specification
Tolerances
Temperature Coefficient
Value
±0.01% to ±10% ( 1% Standard )
>10W : ±20ppm/K
1W to10W : ±50ppm/K
<1W : Call Factory
-55°C to +250°C : Characteristic U
-55°C to +350°C : Characteristic V
500 VAC : UT-1 / UT-1/2A / UT-1/2 / UT-1A
1000 VAC : All Others
Centerless ground ceramic core
Tinned copper or copperweld leads
High temperature / trivalent / inorganic Silicone coating
All welded terminations
Temperature Range
Dielectric Strength
Constuction
Environmental Performance
(MIL-STD 202)
DR
Characteristic U
±0.2% + 0.05W
±1% + 0.05W
±0.2% + 0.05W
±0.2% + 0.05W
±0.2% + 0.05W
±0.2% + 0.05W
±0.1% + 0.05W
±0.1% + 0.05W
120
100
Characteristic V
±0.2% + 0.05W
±3% + 0.05W
±2% + 0.05W
±2% + 0.05W
±2% + 0.05W
±2% + 0.05W
±0.2% + 0.05W
±0.2% + 0.05W
Dielectric
Load Life
Storage
Moisture Resistance
Thermal Shock
5X Overload ( 5s )
Shock
Vibration
Power Derating Curve
Power ( % )
80
60
40
20
0
CH
AR
CH
AR
V
U
0
50
100
150
200
250
300
350
400
Ordering Information
For Non-Inductive Windings / insert the letter “N” ( i.e. UTN-5 )
Part Number - Resistance - Tolerance - TCR ( If not standard )
Example: UT-5 25kOhms 0.1%
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
info@willow.co.uk
rev. 03/2006A
UT Series
Silicone Coated Power Resistors
SPECIFICATIONS
(continued)
Type
Wattage Rating
( Watts )
U
V
0.25
0.5
0.9
1.5
2.0
3.0
3.75
4.0
3.5
5.5
6.5
6.5
6.5
9.0
9.0
9.0
13
Dimensions
Maximum
Ohms
2
±0.062”
[±1.6mm]
A
±0.031”
[±0.8mm]
B
±0.002”
[±0.05mm]
0.018 [0.46]
0.020 [0.5]
0.025 [0.6]
0.020 [0.5]
0.025 [0.6]
0.020 [0.5]
0.025 [0.6]
0.032 [0.8]
0.025 [0.6]
0.032 [0.8]
0.032 [0.8]
0.040 [1.0]
0.032 [0.8]
0.032 [0.8]
0.032 [0.8]
0.040 [1.0]
0.040 [1.0]
0.032 [0.8]
0.040 [1.0]
0.040 [1.0]
0.040 [1.0]
0.040 [1.0]
0.040 [1.0]
C
1
Maximum
Working
Voltage
MIL-R-26 /
MIL-R-39007
Style
UT-1
UT-1/2A
UT-1/2
3
UT-1A
UT-2
UT-2A
UT-2B
UT-2C
UT-2E
UT-3
UT-5
UT-5A
UT-6
UT-7A
3
UT-7B
UT-7C
UT-10
0.1
0.4
0.75
1.0
1.5
2.5
3.0
3.0
3.0
4.0
5.0
5.0
5.0
7.0
7.0
7.0
10
500
2.5k
7.5k
10k
12.5k
22k
22k
40k
30k
45k
91k
65k
95k
150k
100k
154k
260k
0.150 [3.8]
0.250 [6.4]
0.330 [8.4]
0.406 [10.3]
0.350 [8.9]
0.500 [12.7]
0.560 [14.2]
0.500 [12.7]
0.500 [12.7]
0.625 [15.9]
0.875 [22.2]
0.970 [24.6]
1.000 [25.4]
1.375 [35.0]
1.400 [35.6]
1.220 [31.0]
1.780 [45.2]
0.078 [2.0]
0.078 [2.0]
0.078 [2.0]
0.094 [2.4]
0.156 [4.0]
0.187 [4.7]
0.187 [4.7]
0.250 [6.4]
0.200 [5.1]
0.250 [6.4]
0.312 [7.9]
0.203 [5.2]
0.312 [7.9]
0.375 [9.5]
0.312 [7.9]
0.312 [7.9]
0.375 [9.5]
8.5
20
29
52
60
130
140
140
140
210
360
390
504
650
590
620
850
RW-78
RWR-78
RW-67
RW-74
RWR-74
RW-69
RW-79
RWR-79
RW-70
Lead Diameter: 18 AWG = 0.040” / 20 AWG = 0.032” / 22 AWG = 0.025” / 24 AWG = 0.020” / 25 AWG = 0.018”
Where more than one lead is listed / the top value is Standard
2
For non-inductive windings / divide maximum resistance by 2
3
This part does not meet the RoHS directive - call factory for details
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
info@willow.co.uk
rev. 03/2006A
NXP MCU
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