UAL Series
Aluminum Housed Wirewound Resistors
•
•
•
•
•
•
•
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
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.
b
Heatsink Required : 0.040 [1.0] Alum. Plate, 167 in
2
[1077 cm
2
] or equiv.
c
Heatsink Required : 0.059 [1.5] Alum. Plate, 291 in
2
[1877 cm
2
] or equiv.
d
Heatsink Required : 0.125 [3.2] Alum. Plate, 294 in
2
[1896 cm
2
] or equiv.
e
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%
Willow Technologies Ltd.
Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, United Kingdom.
http://www.willow.co.uk
+ 44 (0) 1342 835234
+ 44 (0) 1342 834306
info@willow.co.uk
rev. 03/2006A
UAL Series
Aluminum Housed Wirewound Resistors
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
un
ted
on
Power ( % )
60
40
20
0
0
A
B
C
D
He
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)
Willow Technologies Ltd.
Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, United Kingdom.
http://www.willow.co.uk
+ 44 (0) 1342 835234
+ 44 (0) 1342 834306
info@willow.co.uk
rev. 03/2006A
UAL Series
Aluminum Housed Wirewound Resistors
Dimensions
Type
UAL-5
UAL-10
UAL-25
UAL-50
±0.005
[±0.13]
0.444
[11.3]
0.562
[14.3]
0.719
[18.3]
1.563
[39.7]
A
±0.005
[±0.13]
0.490
[12.4]
0.625
[15.9]
0.781
[19.8]
0.844
[21.4]
B
±0.031
[±0.8]
0.600
[15.2]
0.750
[19.1]
1.062
[27.0]
1.968
[50.0]
C
±0.062
[±1.6]
1.125
[28.5]
1.375
[35.0]
1.938
[49.2]
2.781
[70.6]
D
±0.015
[±0.4]
0.334
[8.5]
0.430
[10.9]
0.530
[13.5]
0.615
[15.6]
E
±0.015
[±0.4]
0.646
[16.4]
0.800
[20.3]
1.080
[27.4]
1.140
[29.0]
F
±0.015
[±0.4]
0.320
[8.1]
0.400
[10.2]
0.560
[14.2]
0.615
[15.6]
G
±0.010
[±0.25]
0.065
[1.7]
0.075
[1.9]
0.085
[2.2]
0.085
[2.2]
H
±0.010
[±0.25]
0.140
[3.6]
0.190
[4.8]
0.260
[6.6]
0.300
[7.6]
J
±0.010
[±0.25]
0.078
[2.0]
0.093
[2.4]
0.172
[4.4]
0.196
[5.0]
K
±0.005
[±0.13]
0.093
[2.4]
0.093
[2.4]
0.125
[3.2]
0.125
[3.2]
L
±0.015
[±0.4]
0.078
[2.0]
0.102
[2.6]
0.125
[3.2]
0.125
[3.2]
M
±0.005
[±0.13]
0.050
[1.3]
0.086
[2.2]
0.086
[2.2]
0.086
[2.2]
N
±0.062
[±1.6]
0.266
[6.8]
0.312
[7.9]
0.438
[11.1]
0.438
[11.1]
O
±0.031
[±0.8]
0.245
[6.2]
0.312
[7.9]
0.391
[9.9]
0.422
[10.7]
P
±0.002
[±0.05]
0.051
[1.30]
0.081
[2.06]
0.081
[2.06]
0.081
[2.06]
Q
±0.031
[±0.8]
0.085
[2.2]
0.140
[3.6]
0.140
[3.6]
0.140
[3.6]
R
Type
UAL-100
UAL-180
UAL-250
±0.005
[±0.13]
2.750
[69.9]
2.750
[69.9]
3.875
[98.4]
A
±0.005
[±0.13]
-
-
3.000
[76.2]
Aa
±0.005
[±0.13]
2.250
[57.2]
2.500
[63.5]
1.062
[63.5]
B
±0.031
[±0.8]
3.500
[88.9]
3.500
[88.9]
4.500
[114]
C
±0.062
[±1.6]
5.480
[139]
5.480
[139]
7.000
[178]
D
±0.015
[±0.4]
1.800
[45.7]
2.100
[55.3]
2.100
[55.3]
E
±0.015
[±0.4]
2.810
[71.4]
3.000
[76.2]
3.00
[76.2]
F
±0.015
[±0.4]
1.750
[44.5]
2.190
[55.6]
2.190
[55.6]
G
±0.010
[±0.25]
0.188
[4.8]
0.250
[6.4]
0.250
[6.4]
H
±0.015
[±0.4]
0.800
[20.3]
0.950
[24.1]
1.000
[25.4]
J
±0.015
[±0.4]
0.375
[9.5]
0.375
[9.5]
0.312
[7.9]
K
±0.005
[±0.13]
0.188
[4.8]
0.188
[4.8]
0.188
[4.8]
L
±0.015
[±0.4]
0.225
[5.7]
0.200
[5.1]
0.200
[5.1]
M
N
±0.015
[±0.4]
-
-
1.188
[30.7]
P
Mtg.
Screw
12-24
12-24
1/4-20
(2) #8
(2) #8
(4) #8
Willow Technologies Ltd.
Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, United Kingdom.
http://www.willow.co.uk
+ 44 (0) 1342 835234
+ 44 (0) 1342 834306
info@willow.co.uk
03/2006A
UAL Series
Aluminum Housed Wirewound Resistors
Dimensions
(continued)
Type
UAL-300
MAX
A
MAX
B
MAX
C
MAX
D
MAX
E
±0.010
[±0.3]
F
±0.010
[±0.3]
G
MAX
H
MAX
J
MAX
K
±0.010
[±0.3]
L
MAX
M
±0.010
[±0.3]
N
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]
Willow Technologies Ltd.
Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, United Kingdom.
http://www.willow.co.uk
+ 44 (0) 1342 835234
+ 44 (0) 1342 834306
info@willow.co.uk
03/2006A
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