Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704
www.riedon.com Page 135
1.01
UT Series
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
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SPECIFICATIONS
Specifi cation Value
Tolerances ±0.01% to ±10% ( 1% Standard )
Temperature Coeffi cient >10Ω : ±20ppm/K
1Ω to10Ω : ±50ppm/K
<1Ω : Call Factory
Temperature Range -55°C to +250°C : Characteristic U
-55°C to +350°C : Characteristic V
Dielectric Strength 500 VAC : UT-1 / UT-1/2A / UT-1/2 / UT-1A
1000 VAC : All Others
Constuction Centerless ground ceramic core
Tinned copper or copperweld leads
High temperature / trivalent / inorganic Silicone coating
All welded terminations
Environmental Performance
(MIL-STD 202)
ΔR
Characteristic U Characteristic V
Dielectric ±0.2% + 0.05Ω±0.2% + 0.05Ω
Load Life ±1% + 0.05Ω ±3% + 0.05Ω
Storage ±0.2% + 0.05Ω±2% + 0.05Ω
Moisture Resistance ±0.2% + 0.05Ω±2% + 0.05Ω
Thermal Shock ±0.2% + 0.05Ω±2% + 0.05Ω
5X Overload ( 5s ) ±0.2% + 0.05Ω±2% + 0.05Ω
Shock ±0.1% + 0.05Ω±0.2% + 0.05Ω
Vibration ±0.1% + 0.05Ω±0.2% + 0.05Ω
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%
0 50 100 150 200 250 300 350 400
0
20
40
60
80
100
120
Power ( % )
Ambient Temperature (°C)
CHAR U
CHAR V
Power Derating Curve
Silicone Coated Power Resistors
Ordering Information
Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704
www.riedon.com Page 136
1.01
Type
Wattage Rating
( Watts ) Maximum
Ohms 2
Dimensions Maximum
Working
Voltage
MIL-R-26 /
MIL-R-39007
Style
A
±0.062”
[±1.6mm]
B
±0.031”
[±0.8mm]
C1
±0.002”
[±0.05mm]
UV
UT-1 0.1 0.25 500 0.150 [3.8] 0.078 [2.0] 0.018 [0.46] 8.5
UT-1/2A 0.4 0.5 2.5k 0.250 [6.4] 0.078 [2.0] 0.020 [0.5]
0.025 [0.6] 20
UT-1/2 0.75 0.9 7.5k 0.330 [8.4] 0.078 [2.0] 0.020 [0.5]
0.025 [0.6] 29
UT-1A 1.0 1.5 10k 0.406 [10.3] 0.094 [2.4] 0.020 [0.5]
0.025 [0.6] 52 RW-70
UT-2 1.5 2.0 12.5k 0.350 [8.9] 0.156 [4.0] 0.032 [0.8] 60
UT-2A 2.5 3.0 22k 0.500 [12.7] 0.187 [4.7] 0.032 [0.8] 130 RW-69
UT-2B 3.0 3.75 22k 0.560 [14.2] 0.187 [4.7] 0.032 [0.8] 140 RW-79
RWR-79
UT-2C 3.0 4.0 40k 0.500 [12.7] 0.250 [6.4] 0.040 [1.0]
0.032 [0.8] 140
UT-2E 3.0 3.5 30k 0.500 [12.7] 0.200 [5.1] 0.032 [0.8] 140
UT-3 4.0 5.5 45k 0.625 [15.9] 0.250 [6.4] 0.040 [1.0]
0.032 [0.8] 210
UT-5 5.0 6.5 91k 0.875 [22.2] 0.312 [7.9] 0.040 [1.0] 360 RW-74
RWR-74
UT-5A 5.0 6.5 65k 0.970 [24.6] 0.203 [5.2] 0.032 [0.8] 390
UT-6 5.0 6.5 95k 1.000 [25.4] 0.312 [7.9] 0.040 [1.0] 504 RW-67
UT-7A 7.0 9.0 150k 1.375 [35.0] 0.375 [9.5] 0.040 [1.0] 650
UT-7B 7.0 9.0 100k 1.400 [35.6] 0.312 [7.9] 0.040 [1.0] 590
UT-7C 7.0 9.0 154k 1.220 [31.0] 0.312 [7.9] 0.040 [1.0] 620
UT-10 10 13 260k 1.780 [45.2] 0.375 [9.5] 0.040 [1.0] 850 RW-78
RWR-78
SPECIFICATIONS (continued)
1 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
UT Series
Silicone Coated Power Resistors
