For technical questions, contact: powertron@vishaypg.com
USL Series
Powertron
Document Number: 64325
Revision: 20-09-10
www.powertron.de
1
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
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%
UAL-25-4T
UAL-25-4
UAL-25-4TR
Ordering Information
Type
MIL-R-39009
MIL-R-18546
Style
Power Rating ( W @ 25°C ) Resistance
Range1
Commercial MIL Free Air
UAL-5 RER-60 / RE-60 7.5 a5 a4.5 0.01 to 22K
UAL-10 RER-65 / RE-65 12.5 a10 a7.5 0.01 to 47K
UAL-25 RER-70 / RE-70 25 b20 b12 0.01 to 90K
UAL-50 RER-75 / RE-75 50 c30 c20 0.01 to 250K
UAL-100 RER-77 / RE-77 100 d75 d40 0.01 to 50K
UAL-180 -180 d- - 0.01 to 50K
UAL-250 RER-80 / RE-80 250 d120 d100 0.01 to 50K
UAL-300 -300 e- 75 0.005 to 100K
1 For non-inductive windings, divide maximum resistance by 2
a Heatsink Required : 0.040 [1.0] Alum. Plate, 129 in2 [832 cm2] or equiv.
b Heatsink Required : 0.040 [1.0] Alum. Plate, 167 in2 [1077 cm2] or equiv.
c Heatsink Required : 0.059 [1.5] Alum. Plate, 291 in2 [1877 cm2] or equiv.
d Heatsink Required : 0.125 [3.2] Alum. Plate, 294 in2 [1896 cm2] or equiv.
e Heatsink Required : 0.125 [3.2] Alum. Plate, 895 in2 [5780 cm2] or equiv.
For technical questions, contact: powertron@vishaypg.com
UAL Series
Powertron
Document Number: 64325
Revision: 20-09-10
www.powertron.de
2
SPECIFICATIONS (continued)
Specication Value
Tolerances ±0.01% to ±10% ( 1% Standard )
Temperature Coefcient >10W : ±20ppm/K
1W to10W : ±50ppm/K
<1W : Call Factory
Temperature Range -55°C to +275°C
Dielectric Strength 1500 VAC
Constuction Centerless ground ceramic core
Tinned copper or copperweld leads
High-temperature epoxy molding Compound
Anodized aluminum housing
All welded terminations
Environmental Performance
(MIL-STD 202) DR
Dielectric ±0.2% + 0.05W
Load Life ±1% + 0.05W
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
Power Derating Curve
Free-air Derating
A : UAL-5, UAL-10
B : UAL-25
C : UAL-50, UAL-100, UAL-250
D : UAL-300
0 50 100 150 200 250 300 350
0
20
40
60
80
100
120
Power ( % )
Ambient Temperature (°C)
Mounted on Heatsink
A
B
C
D
For technical questions, contact: powertron@vishaypg.com
USL Series
Powertron
Document Number: 64325
Revision: 20-09-10
www.powertron.de
3
Dimensions
Type A
±0.005
[±0.13]
B
±0.005
[±0.13]
C
±0.031
[±0.8]
D
±0.062
[±1.6]
E
±0.015
[±0.4]
F
±0.015
[±0.4]
G
±0.015
[±0.4]
H
±0.010
[±0.25]
J
±0.010
[±0.25]
K
±0.010
[±0.25]
L
±0.005
[±0.13]
M
±0.015
[±0.4]
N
±0.005
[±0.13]
O
±0.062
[±1.6]
P
±0.031
[±0.8]
Q
±0.002
[±0.05]
R
±0.031
[±0.8]
UAL-5 0.444
[11.3]
0.490
[12.4]
0.600
[15.2]
1.125
[28.5]
0.334
[8.5]
0.646
[16.4]
0.320
[8.1]
0.065
[1.7]
0.140
[3.6]
0.078
[2.0]
0.093
[2.4]
0.078
[2.0]
0.050
[1.3]
0.266
[6.8]
0.245
[6.2]
0.051
[1.30]
0.085
[2.2]
UAL-10 0.562
[14.3]
0.625
[15.9]
0.750
[19.1]
1.375
[35.0]
0.430
[10.9]
0.800
[20.3]
0.400
[10.2]
0.075
[1.9]
0.190
[4.8]
0.093
[2.4]
0.093
[2.4]
0.102
[2.6]
0.086
[2.2]
0.312
[7.9]
0.312
[7.9]
0.081
[2.06]
0.140
[3.6]
UAL-25 0.719
[18.3]
0.781
[19.8]
1.062
[27.0]
1.938
[49.2]
0.530
[13.5]
1.080
[27.4]
0.560
[14.2]
0.085
[2.2]
0.260
[6.6]
0.172
[4.4]
0.125
[3.2]
0.125
[3.2]
0.086
[2.2]
0.438
[11.1]
0.391
[9.9]
0.081
[2.06]
0.140
[3.6]
UAL-50 1.563
[39.7]
0.844
[21.4]
1.968
[50.0]
2.781
[70.6]
0.615
[15.6]
1.140
[29.0]
0.615
[15.6]
0.085
[2.2]
0.300
[7.6]
0.196
[5.0]
0.125
[3.2]
0.125
[3.2]
0.086
[2.2]
0.438
[11.1]
0.422
[10.7]
0.081
[2.06]
0.140
[3.6]
Type A
±0.005
[±0.13]
Aa
±0.005
[±0.13]
B
±0.005
[±0.13]
C
±0.031
[±0.8]
D
±0.062
[±1.6]
E
±0.015
[±0.4]
F
±0.015
[±0.4]
G
±0.015
[±0.4]
H
±0.010
[±0.25]
J
±0.015
[±0.4]
K
±0.015
[±0.4]
L
±0.005
[±0.13]
M
±0.015
[±0.4]
N
P
±0.015
[±0.4]
Mtg.
Screw
UAL-
100
2.750
[69.9] -2.250
[57.2]
3.500
[88.9]
5.480
[139]
1.800
[45.7]
2.810
[71.4]
1.750
[44.5]
0.188
[4.8]
0.800
[20.3]
0.375
[9.5]
0.188
[4.8]
0.225
[5.7] 12-24 -(2) #8
UAL-
180
2.750
[69.9] -2.500
[63.5]
3.500
[88.9]
5.480
[139]
2.100
[55.3]
3.000
[76.2]
2.190
[55.6]
0.250
[6.4]
0.950
[24.1]
0.375
[9.5]
0.188
[4.8]
0.200
[5.1] 12-24 -(2) #8
UAL-
250
3.875
[98.4]
3.000
[76.2]
1.062
[63.5]
4.500
[114]
7.000
[178]
2.100
[55.3]
3.00
[76.2]
2.190
[55.6]
0.250
[6.4]
1.000
[25.4]
0.312
[7.9]
0.188
[4.8]
0.200
[5.1] 1/4-20 1.188
[30.7] (4) #8
For technical questions, contact: powertron@vishaypg.com
UAL Series
Powertron
Document Number: 64325
Revision: 20-09-10
www.powertron.de
4
Dimensions (continued)
Type A
MAX
B
MAX
C
MAX
D
MAX
E
MAX
F
±0.010
[±0.3]
G
±0.010
[±0.3]
H
MAX
J
MAX
K
MAX
L
±0.010
[±0.3]
M
MAX
N
±0.010
[±0.3]
UAL-300 2.854
[72.5]
7.260
[184.4]
1.646
[41.8]
1.791
[45.5]
5.028
[127.7]
4.094
[104.0]
2.323
[59.0]
0.807
[20.5]
0.488
[12.4]
0.217
[5.5]
0.260
[6.6]
5.567
[141.4]
2.047
[52.0]
Vishay Precision Group
Document No.: 63999
Revision: 27-Apr-11
www.vishaypg.com
1
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purchase, including but not limited to, the warranty expressed therein.
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Document No.: 63999
Revision: 27-Apr-11
