Ultra Precision Wire-Wound Resistors
Type UPW Series
Characteristics -
Electrical
Type UPW Series
UPW15
UPW25
UPW30
UPW50
Rated Power @ 125°C (W)
Derate to zero at 145°C
0.125
0.25
0.3
0.5
Resistance Range (Ohms) Min
Max
R10
300K
R10
1M0
R10
1M0
R10
2M0
Tolerance (%)
0.005 0.01 0.02 0.05 0.1 0.2 0.5 1
Code Letter
E
L
P
W
B
A
D
F
Limiting Element Voltage (V)
Temperature Coefficient (ppm/°C) Typ.
Max.
Operating Temperature Range (°C)
Long Term Stability (Load)
150
300
150
400
3 (0°C to +85°C)
The resistive element is wire wound
5 (-55°C to +125°C) 1 available on request
-55 to +145
onto
a
moulded high temperature
plastic bobbin with a central former.
The direction of winding is reversed
part way through the winding, giving
very low values of inductance.
< 50 ppm @ 10,000 hrs
< 100ppm @ 26,000 hrs
< 0.2 µ V /°C
Thermal EMF
These Neohm resistors use bobbin
assemblies with flattened lead ends,
providing high resistance to pull,
vibration and torsional forces during
handling, assembly and life.
Dimensions
Style A
Style B
Key Features
ꢀ
Custom weld tabs and copper
weld leads ensure a good
mechanical and electrical
connection between the
element and the lead wires.
Protection is given to the
windings by means of a layer
of silicone RTV rubber. This
allows movement of the
windings during temperature
cycling due to loads and
to varying ambient
Type
Style
L
0.4
6.35
D
0.4
3.18
W
0.5
s
0.2
d nom
0.64
0.64
0.64
0.81
UPW15
UPW25
UPW30
UPW50
A
A
B
A
-
-
-
9.53
7.62
12.7
4.75
7.62
6.35
-
3.81
-
3.18
-
Derating Curve
temperatures. Outer protec-
tion is given by means of a
hot transfer moulded epoxy
compound which ensures an
airtight coating with no
trapped air.
100
80
1%, 0.5%, 0.2%, 0.1%
0.05%
60
40
20
0
0.02%
0.01%
ꢀ
Superior quality wire-wound
resistors with very low
selection tolerances and
temperature coefficients
down to 1 ppm. 3 case sizes
are available. T/C, ratio and
pair matching is available
and customer specifications
are welcome. These compo-
nents exhibit high stability
under load and severe
0.005%
40
60
80
100
120
140
160
Ambient Temperature (°C)
UPW Series resistors must be derated for tolerances below 0.1%. Use the graph to select tolerance versus operating
temperature to determine the percentage rated power for operation.
No derating is required for operation below 20 °C.
environmental conditions.
Mounting
The resistors are suitable for processing on automatic insertion equipment and cutting and bending machines.
Literature No. 1773299
Issued: 04-05
Dimensions are shown for
reference purposes only.
Dimensions are in millimetres Specifications subject to
unless otherwise specified.
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