UB Series
Powertron
•
•
•
•
•
•
•
Resistances from 0.005 to 260kOhms
Power Rating 1 to 18Watts
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
Wattage Rating
( Watts )
U
UB-1
UB-2
3
UB-3
UB-5
UB-5C
UB-6
UB-10
UB-12
UB-15
1
2
3
Dimensions
Maximum
Ohms
2
±0.062”
[±1.6mm]
Type
A
V
1.5
2
3
5
7
8
10
12
18
3.4k
7.5k
10k
25k
32k
50k
95k
150k
260k
±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]
C
1
Maximum
Working
Voltage
MIL-R-26 /
MIL-
R-39007
Style
RW-81
RWR-81
RWR-82
RW-80
RWR-80
1
1.5
2
4
5
6
7
10
15
0.250 [6.4]
0.312 [7.9]
0.406 [10.3]
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]
0.187 [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
162
194
258
425
607
1050
RW-84
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
This part does not meet the RoHS directive - call factory for details
Ordering Information
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%
Document Number: 64326
Revision: 20-09-10
For technical questions, contact:
powertron@vishaypg.com
www.powertron.de
1
UB Series
Powertron
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 : Characteristic U
-55°C to +350°C : Characteristic V
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
Constuction
Environmental Performance
(MIL-STD 202)
DR
Characteristic U
±0.2% + 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
Characteristic V
±0.2% + 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
to ±1% depending on size and Resistance Value
Power Derating Curve
120
100
Power ( % )
80
60
40
20
0
CH
A
CH
RV
AR
U
0
50
100
150
200
250
300
350
400
Ambient Temperature (°C)
www.powertron.de
2
For technical questions, contact:
powertron@vishaypg.com
Document Number: 64326
Revision: 20-09-10
Legal Disclaimer Notice
Vishay Precision Group
Disclaimer
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behalf (collectively, “Vishay Precision Group”), disclaim any and all liability for any errors, inaccuracies or
incompleteness contained herein or in any other disclosure relating to any product.
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purchase, including but not limited to, the warranty expressed therein.
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and conditions of purchase.
To the maximum extent permitted by applicable law, Vishay Precision Group
disclaims (i) any and all liability arising out of the application or use of any product, (ii) any and all liability,
including without limitation special, consequential or incidental damages, and (iii) any and all implied
warranties, including warranties of fitness for particular purpose, non-infringement and merchantability.
Information provided in datasheets and/or specifications may vary from actual results in different applications
and performance may vary over time. Statements regarding the suitability of products for certain types of
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properties described in the product specification is suitable for use in a particular application.
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Document No.: 63999
Revision: 27-Apr-11
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