Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704
www.riedon.com sales@riedon.com Revised: 201807_001© Riedon, Inc.
Type Wattage Rating
( Watts )
Maximum
Ohms 2
Dimensions Maximum
Working
Voltage
MIL-R-26 /
MIL-R-39007
Style
A
±0.062”
[±1.6mm]
B3
±0.031”
[±0.8mm]
C1
±0.002”
[±0.05mm]
UB-1 1 3.4k 0.250 [6.4] 0.085 [2.2] 0.020 [0.5]
0.025 [0.6] 33 RW-81
RWR-81
UB-2 1.5 7.5k 0.312 [7.9] 0.078 [2.0] 0.020 [0.5]
0.025 [0.6] 42 RWR-82
UB-3 2 10k 0.406 [10.3] 0.094 [2.4] 0.025 [0.6]
0.020 [0.5] 80 RW-80
RWR-80
UB-3C 3 12.5k 0.350 [8.9] 0.156 [4.0] 0.032 [0.8] 135
UB-5 4 25k 0.560 [14.2] 0.187 [4.7] 0.032 [0.8] 162
UB-5C 5 32k 0.500 [12.7] 0.250 [6.4] 0.040 [1.0] 194
UB-6 6 50k 0.625 [15.9] 0.250 [6.4] 0.040 [1.0] 258
UB-10 7 95k 0.875 [22.2] 0.312 [7.9] 0.040 [1.0] 425 RW-84
UB-12 10 150k 1.220 [31.0] 0.312 [7.9] 0.040 [1.0] 607
UB-15 15 260k 1.780 [45.2] 0.375 [9.5] 0.040 [1.0] 1050
1 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
2 For non-inductive windings / divide maximum resistance by 2
3 For non-inductive winding where R ≤ 0.10 Ohms, Tolerance is +0.063/-0.00 [+1.6/-0.0 mm]
UB Series
• 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
• Flame resistant coating
SPECIFICATIONS
Miniature Silicone Coated Power Resistors
Riedon Inc. 300 Cypress Avenue Alhambra CA 91801 (626) 284-9901 (626) 284-1704
www.riedon.com sales@riedon.com Revised: 201807_001© Riedon, Inc.
SPECIFICATIONS (continued)
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%
0 -50 0 50 100 150 200 250 300
0
20
40
60
80
100
120
Power ( % )
Ambient Temperature (°C)
Power Derating Curve
Specication Value
Tolerances ±0.01% to ±10% ( 1% Standard )
Temperature Coecient >10W : ±20ppm/K
1W to10W : ±50ppm/K
<1W : Call Factory
Temperature Range -55°C to +250°C
Dielectric Strength 500 VAC : UB-1 / UB-2 / UB-3
1000 VAC : All Others
Construction Centerless ground ceramic core
Matte Tin over Copper
Flame resistant / High temperature / trivalent / inorganic Silicone coating
All welded terminations
Environmental Performance
(MIL-STD 202) DR
Dielectric ±0.2% + 0.05W
Load Life To ±1% Depending on Size and Resistance Value
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
UB Series
Silicone Coated Power Resistors
Ordering Information
