Ultra Precision Wire-Wound Resistors
Type UPW Series
Type UPW Series
Characteristics -
Electrical
Rated Power @ 125°C (W)
Derate to zero at 145°C
Resistance Range (Ohms) Min
Max
Tolerance (%)
Code Letter
Limiting Element Voltage (V)
Temperature Coefficient (ppm/°C) Typ.
Max.
Operating Temperature Range (°C)
Long Term Stability (Load)
Thermal EMF
UPW15
0.125
R10
300K
UPW25
0.25
UPW30
0.3
UPW50
0.5
R10
2M0
150
The resistive element is wire wound
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.
These Neohm resistors use bobbin
assemblies with flattened lead ends,
providing high resistance to pull,
vibration and torsional forces during
handling, assembly and life.
R10
R10
1M0
1M0
0.005 0.01 0.02 0.05 0.1 0.2 0.5 1
E
L
P
W
B A D F
300
150
± 3 (0°C to +85°C)
± 5 (-55°C to +125°C) ± 1 available on request
-55 to +145
< 50 ppm @ 10,000 hrs
< 100ppm @ 26,000 hrs
< 0.2 µ V /°C
400
Dimensions
Style A
Style B
Key Features
I
Percent Rated Power
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
temperatures. Outer protec-
tion is given by means of a
hot transfer moulded epoxy
compound which ensures an
airtight coating with no
trapped air.
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
environmental conditions.
Type
UPW15
UPW25
UPW30
UPW50
Style
A
A
B
A
L ± 0.4
6.35
9.53
7.62
12.7
D ± 0.4
3.18
4.75
7.62
6.35
W ± 0.5
-
-
3.18
-
s ± 0.2
-
-
3.81
-
d nom
0.64
0.64
0.64
0.81
Derating Curve
100
80
0.05%
1%, 0.5%, 0.2%, 0.1%
60
40
20
0
40
I
0.02%
0.01%
0.005%
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.
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
unless otherwise specified.
Specifications subject to
change.
www.tycoelectronics.com
passives.tycoelectronics.com
Ultra Precision Wire-Wound Resistors
Type UPW Series
Marking
The resistors are marked with the following information:- Manufacturer's name, type number, value and tolerance,
four figure date code.
Packaging
UPW Series resistors are packed loose in boxes.
Performance Characteristics
The evaluation of the performance characteristics is carried out with reference to
IEC specifications QC 400 000 and QC 400 100.
TEST REF
4.23
4.24
4.25.1
4.25.3
TEST REF
4.13
4.16
4.18
4.19
4.22
Long Term Tests ±(0.25% + 0.05 ohm)
Climatic sequence
Damp heat, steady state
Endurance at 70 °C
Endurance at 145 °C
Short Term Tests ±(0.1% + 0.01 ohm)
Overload
Robustness of terminations
Resistance to soldering heat
Rapid change of temperature
Vibration
All resistance values are measured at a distance of 9.53mm (0.375 inch) from
the end cap.
How to Order
Orders for these components should include the following information:-
Type, tolerance code letter and value e.g.
UPW30 L 1K15
Literature No. 1773299
Issued: 04-05
Dimensions are shown for
reference purposes only.
Dimensions are in millimetres
unless otherwise specified.
Specifications subject to
change.
www.tycoelectronics.com
passives.tycoelectronics.com
