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Ideal for automotive applications and
power supplies
Electrical Data
Power rating at 25擄C
Power rating at 70擄C
Resistance range
TCR (-55 to 155擄C)
Resistance tolerance
Standard values
Thermal impedance
Ambient temperature range
Limiting element voltage
TCR
0.01 ohms
0.033 ohms
0.091 ohms
10 ohms
10K ohms
ppm/擄C
<1000
<500
<200
<150
<100
watts
watts
ohms
ppm/擄C
%
擄C/watt
擄C
volts
W31
3.0
2.5
0.01 to 10k
See below
5 2 1
E24 series preferred
83
-55 to 155
100
NOTES
Other values to special order
Physical data
Dimensions (mm) and Weight (g)
Type
L max.
D max.
f min.
W31
13
5.6
22.75
d nom.
0.8
Wt.
nom.
1.0
d dia
D
L
f
CONSTRUCTION
A high quality ceramic substrate is assembled with
interference fit end caps to which are welded the element
winding and termination wires. The protection is then
applied to the body, providing an effective seal which is
impervious to moisture, shock, vibration, fungus and salt
spray.
TERMINATIONS
Material
Solder-coated copper clad steel wire.
Strength
The terminations meet the requirements of
IEC 68.2.21.
Solderability
The terminations meet the requirements of
IEC 115-1, Clause 4.17.3.2.
MARKING
W31 resistors are legend marked with type reference,
resistance value and tolerance. Values are marked in
accordance with IEC 62.
SOLVENT RESISTANCE
The body and marking are resistant to all normal industrial
cleaning solvents suitable for printed circuits.
FLAMMABILITY
The resistor coating will not burn under any condition of
applied temperature or component overload.
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn鈥檚 own data and is considered accurate at time of going to print.
漏 Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, England Tel: 01670 822181 Fax: 01670 829465 Web: http://www.Welwyn-TT.co.uk
Issue A 07/99
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