UB Series
Miniature Silicone Coated Power Resistors
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High Power Rating in a Small Package
Excellent Pulse Handling
High Temperature: -55°C to +250°C
Resistances from 0.02 to 260kOhms
Power Rating 1 to 15Watts
Resistance Tolerances to ± 0.01%
Low TCR: ± 20ppm/K Standard
MIL-R-26 / MIL-R-39007 Power Ratings
Non-Inductive Windings Available
SPECIFICATIONS
Type
Wattage Rating
( Watts )
Maximum
Ohms
2
Dimensions
±0.062”
[±1.6mm]
A
±0.031”
[±0.8mm]
B
±0.002”
[±0.05mm]
0.020 [0.5]
0.025 [0.6]
0.020 [0.5]
0.025 [0.6]
0.025 [0.6]
0.020 [0.5]
0.032 [0.8]
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
RW-81
RWR-81
RWR-82
RW-80
RWR-80
UB-1
UB-2
UB-3
UB-3C
UB-5
UB-5C
UB-6
UB-10
UB-12
UB-15
1
1.5
2
3
4
5
6
7
10
15
3.4k
7.5k
10k
12.5k
25k
32k
50k
95k
150k
260k
0.250 [6.4]
0.312 [7.9]
0.406 [10.3]
0.350 [8.9]
0.560 [14.2]
0.500 [12.7]
0.625 [15.9]
0.875 [22.2]
1.220 [31.0]
1.780 [45.2]
0.085 [2.2]
0.078 [2.0]
0.094 [2.4]
0.156 [4.0]
0.187 [4.7]
0.218 [5.5]
0.250 [6.4]
0.312 [7.9]
0.312 [7.9]
0.375 [9.5]
33
42
80
135
162
194
258
425
607
1050
RW-84
1
2
Lead Diameter: 18 AWG = 0.040” / 20 AWG = 0.032” / 22 AWG = 0.025” / 24 AWG = 0.020”
Where more than one lead is listed / the top value is Standard
For non-inductive windings / divide maximum resistance by 2
Riedon Inc.
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704
6/13
UB Series
Silicone Coated Power Resistors
SPECIFICATIONS
(continued)
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
500 VAC : UB-1 / UB-2 / UB-3
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
Construction
Environmental Performance
(MIL-STD 202)
DR
±0.2% + 0.05W
To ±1% Depending on Size and Resistance Value
Dielectric
Load Life
Storage
Moisture Resistance
Thermal Shock
5X Overload ( 5s )
Shock
Vibration
±0.2% + 0.05W
±0.2% + 0.05W
±0.2% + 0.05W
±0.2% + 0.05W
±0.1% + 0.05W
±0.1% + 0.05W
Power Derating Curve
120
100
Power ( % )
80
60
40
20
0
0
-50
0
50
100
150
200
250
300
Ambient Temperature (°C)
Ordering Information
For Non-Inductive Windings / insert the letter “N” ( i.e. UBN-5 )
Part Description: Part Type - Resistance - Tolerance - TCR ( If not standard )
Example: UB-3 10 Ohm 1%
Riedon Inc.
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
(626) 284-1704
6/13
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