Ultra Precision Wire-Wound Resistors

Type UPW Series

Literature No. 1773299

Issued: 04-05

Dimensions are shown for

reference purposes only.

Dimensions are in millimetres

unless otherwise specified.

Specifications subject to

change.

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Key Features

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.

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 UPW Series

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.

Characteristics -

Electrical

UPW15

UPW25

UPW30

UPW50

Rated Power @ 125°C (W)

0.125

0.25

0.3

0.5

Derate to zero at 145°C

Resistance Range (Ohms) Min

R10

R10

R10

R10

Max

300K

1M0

1M0

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)

150

300

150

400

Temperature Coefficient (ppm/°C) Typ.

± 3 (0°C to +85°C)

Max.

± 5 (-55°C to +125°C) ± 1 available on request

Operating Temperature Range (°C)

-55 to +145

Long Term Stability (Load)

< 50 ppm @ 10,000 hrs

< 100ppm @ 26,000 hrs

Thermal EMF

< 0.2 µ V /°C

Dimensions

Style A

Style B

Type

Style

L ± 0.4

D ± 0.4

W ± 0.5

s ± 0.2

d nom

UPW15

A

6.35

3.18

-

-

0.64

UPW25

A

9.53

4.75

-

-

0.64

UPW30

B

7.62

7.62

3.18

3.81

0.64

UPW50

A

12.7

6.35

-

-

0.81

Derating Curve

40

60

80

100

120

140

160

100

80

60

40

20

0

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.

1%, 0.5%, 0.2%, 0.1%

0.05%

0.02%

0.01%

0.005%

Mounting

The resistors are suitable for processing on automatic insertion equipment and cutting and bending machines.