Riedon Inc. 300CypressAvenue AlhambraCA91801 (626)284-9901 (626)284-1704
www.riedon.com
01/10
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]
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] 0.218[5.5] 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
UB Series
• High Power Rating in a Small Package
• Resistances from 0.005 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
• Temperature Range: -55°C to +250°C
• Non-Inductive Windings Available
SPECIFICATIONS
MiniatureSiliconeCoatedPowerResistors
In Stock at
Digi-Key
Riedon Inc. 300CypressAvenue AlhambraCA91801 (626)284-9901 (626)284-1704
www.riedon.com
01/10
SPECIFICATIONS (continued)
ForNon-InductiveWindings/inserttheletter“N”(i.e.UBN-5)
PartNumber-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
Specication Value
Tolerances ±0.01%to±10%(1%Standard)
TemperatureCoefcient >10W:±20ppm/K
1Wto10W:±50ppm/K
<1W:CallFactory
TemperatureRange -55°Cto+250°C:CharacteristicU
-55°Cto+350°C:CharacteristicV
DielectricStrength 500VAC:UB-1/UB-2/UB-3
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) 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