A
f1
f2
6
6
10
± 0.5
f1 – f2
≤ 1.4 mm
Performance Data
CECC 40201-002
ACTUAL PERFORMANCE
Requirements
Maximum
Typical
Load at commercial rating: 1000 hrs at 25°c
∆R%
5
3.5
Load at CECC rating: 1000 hours at 25°c
∆R%
5
5
3.5
Dry heat: 1000 hours at 200°c
∆R%
521
Shelf life: 12 months at room temperature
∆R%
not specified
0.03
0.02
Derating
see derating curve
Short term overload
∆R%
1
1.0
0.2
Climatic
∆R%
5
0.5
0.2
Climatic category
∆R%
55/200/56
Long term damp heat
∆R%
5
0.05
0.02
Temperature rapid change
∆R%
1
0.5
0.2
Resistance to solder heat
∆R%
1
0.25
0.03
Vibration and bump
∆R%
1
0.25
0.05
Noise (in decade of frequency)
µv/v
not specified
zero
zero
Robustness
∆R%
1
0.4
0.05
Insulation resistance
Ohms
not specified
>.1G ohm
>.1G ohm
Voltage Proof
volts
not specified
500 min
500 min
Pulse handling data
available by request
APPLICATION NOTES
The termination should not be bent closer than
1.6mm from the body, and the recommended
minimum bend radius is 1.2mm. The terminations
are solderable to within 4mm from the body.
When cold, vitreous enamel has excellent insulation
resistance. In common with all insulants
the specific resistance of the enamel decreases with
increase in temperature. Therefore, resistors
operated at near maximum temperature cannot be
classed as insulated and should not be used in
contact with any conducting material. Care must be
taken when determining clearance distance between
Vitreous Enamelled
Wirewound Resistors
W20 SERIES
STANDARD QUANTITIES PER PACKAGE
Type
W21
W215
W22
W23
W24
Ammo Pack
1000
750
500
N/A
N/A
Reel
1000
750
700
N/A
N/A
Small Box
N/A
N/A
N/A
50
25
© 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
25
70
200
315
116
100
54
0
Ambient temperature
°C
Derating Curve
Type
A
W21
63±2
W215
73±2
W22
73±2
PACKAGING
For W21 and W215 the standard method of
packaging is taped in Ammo Packs. For W22 the
standard method of packaging is taped and reeled.
Alternatives available by special request are detailed
in the table below.
W23’s and W24’s are available only as loose packed
in boxes. W series resistors can bbe supplied
preformed. Contact factory for details.
the resistor body and the printed circuit board or
other components to ensure these are not over
heated. Resistance is measured 6mm from body.
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