USL Series
Powertron
•
•
•
•
•
•
•
UAL-25-4T
UAL-25-4
UAL-25-4TR
Power Rating 5 to 300Watts
All Welded Construction
Resistances from 0.005 to 250kOhms
Tolerance to ±0.01%
High Overload and Pulse Handling
Low TCR: ± 20ppm/K Standard
Four Terminal Versions Available
SPECIFICATIONS
Type
UAL-5
UAL-10
UAL-25
UAL-50
UAL-100
UAL-180
UAL-250
UAL-300
MIL-R-39009
MIL-R-18546
Style
Power Rating ( W @ 25°C )
Commercial
7.5
a
12.5
a
25
b
50
c
100
d
180
d
250
d
300
e
1
a
b
c
d
e
MIL
5
a
10
a
20
b
30
c
75
d
-
120
d
-
Free Air
4.5
7.5
12
20
40
-
100
75
Resistance
Range
1
0.01 to 22K
0.01 to 47K
0.01 to 90K
0.01 to 250K
0.01 to 50K
0.01 to 50K
0.01 to 50K
0.005 to 100K
RER-60 / RE-60
RER-65 / RE-65
RER-70 / RE-70
RER-75 / RE-75
RER-77 / RE-77
-
RER-80 / RE-80
-
For non-inductive windings, divide maximum resistance by 2
Heatsink Required : 0.040 [1.0] Alum. Plate, 129 in
2
[832 cm
2
] or equiv.
Heatsink Required : 0.040 [1.0] Alum. Plate, 167 in
2
[1077 cm
2
] or equiv.
Heatsink Required : 0.059 [1.5] Alum. Plate, 291 in
2
[1877 cm
2
] or equiv.
Heatsink Required : 0.125 [3.2] Alum. Plate, 294 in
2
[1896 cm
2
] or equiv.
Heatsink Required : 0.125 [3.2] Alum. Plate, 895 in
2
[5780 cm
2
] or equiv.
Ordering Information
For Non-Inductive Windings / insert the letter “N” ( i.e. UALN-25 )
Part Number - Resistance - Tolerance - TCR ( If not standard )
Example: UAL-25 10 Ohm 1%
Document Number: 64325
Revision: 20-09-10
For technical questions, contact:
powertron@vishaypg.com
www.powertron.de
1
UAL 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 +275°C
1500 VAC
Centerless ground ceramic core
Tinned copper or copperweld leads
High-temperature epoxy molding Compound
Anodized aluminum housing
All welded terminations
Temperature Range
Dielectric Strength
Constuction
Environmental Performance
(MIL-STD 202)
DR
±0.2% + 0.05W
±1% + 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
Dielectric
Load Life
Storage
Moisture Resistance
Thermal Shock
5X Overload ( 5s )
Shock
Vibration
Power Derating Curve
120
100
80
Mo
u
nt
ed
on
Power ( % )
He
60
40
20
0
0
A
B
C
D
ats
ink
Free-air Derating
A : UAL-5, UAL-10
B : UAL-25
C : UAL-50, UAL-100, UAL-250
D : UAL-300
50
100
150
200
250
300
350
Ambient Temperature (°C)
www.powertron.de
2
For technical questions, contact:
powertron@vishaypg.com
Document Number: 64325
Revision: 20-09-10
Legal Disclaimer Notice
Vishay Precision Group
Disclaimer
ALL PRODUCTS, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE.
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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.
The product specifications do not expand or otherwise modify Vishay Precision Group’s terms and conditions of
purchase, including but not limited to, the warranty expressed therein.
Vishay Precision Group makes no warranty, representation or guarantee other than as set forth in the terms
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
applications are based on Vishay Precision Group’s knowledge of typical requirements that are often placed on
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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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1
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