W21-22RJI Datasheet, PDF (2/3 Pages) List of Unclassifed Manufacturers – Vitreous Enamelled Wirewound Resistors

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W20 Series
Welwyn Components
Solvent Resistance
The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits
Solvent Resistance
Flammability
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All materials used in the construction of ‘W’ series resistors
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Performance Data
Load at commercial rating: 1000 hrs at 25°C
Load at CECC rating: 1000 hours at 25°C
Dry heat: 1000 hours at 200°C
Shelf life: 12 months at room temperature
Derating
Short term overload
Climatic
Climatic category
Long term damp heat
Temperature rapid change
Resistance to solder heat
Vibration and bump
Noise (in decade of frequency)
Robustness
Insulation resistance
Voltage Proof
Pulse handling
CECC 40201-002
Requirements
R%
R%
5
R%
5
R%
not specified
R%
R%
R%
R%
R%
R%
R%
µv/v
R%
ohms
volts
1
5
55/200/56
5
1
1
1
not specified
1
not specified
not specified
Actual Performance
Maximum
Typical
5
3.5
5
3.5
2
1
0.03
0.02
see derating curve
1.0
0.2
0.5
0.2
0.05
0.02
0.5
0.2
0.25
0.03
0.25
0.05
zero
zero
0.4
0.05
> 1G ohm
> 1G ohm
500 min
500 min
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 the resistor
body and the printed circuit board or other components to
ensure these are not over heated. Resistance is measured
6mm from body.
116
Derating Curve
100
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. W23’s and W24’s are
available only as loose packed in boxes.
10
f₁
f₂
6
b
6
f₁ – f₂ 1.4 mm
54
0
25
70
200
315
Ambient temperature °C
Type
W21
W215
W22
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© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
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