WA80 Datasheet, PDF (2/3 Pages) Welwyn Components Limited – General Purpose Cement Coated Wirewound Resistors

General Purpose Cement
Coated Wirewound Resistors
WA80 Series
Welwyn Components
Marking
WA85 and 87 resistors are legend marked with type
reference, resistance value and tolerance. In conformance
with IEC 62.
WA82, 83, 835 and 84 resistors 0R1 and above are colour
coded with 4 bands in conformance with IEC 62. Values
below 0R1 are 3 band marked, two digits and tolerance,
there is no multiplier band.
Solvent Resistance
The body protection and marking are resistant to all normal
industrial cleaning fluids suitable for printed circuits.
Flammability
The resistor coating will not burn under any condition of
applied temperature or component overload.
Performance Data
Load at rated power: 1000 hrs at 25 or 70°c
Dry heat: 1000 hrs at 200°c
Derating from rated power at 25°c
Short term overload
Climatic
Climatic category
Long term damp Heat: 56 days
T.R.C. & Vibration
Robustness & Solder Heat
Pulse Handling
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
∆R%
Maximum
Typical
5.0 + .001Ω
3.0
5.0 + .001Ω
3.0
See derating curve
5.0 + .001Ω
1.0
5.0 + .001Ω
2.0
55/200/56Ω
5.0 + .001Ω
1.0
5.0 + .001Ω
1.0
5.0 + .001Ω
1.0
Data available by request
Application Notes
Care must be taken when determining clearance between the
resistor body and the P.C.B. or other components. Resistance
is measured 6mm from body.
Packaging
All resistors are supplied tape packed ready for loading onto
automatic sequencing and insertion machines. The critical
dimensions are shown in figure 2.
Component wires will not protrude beyond the outside edge
of the tapes.
130
120
110
100
90
80
70
60
50
40
30
20
10
0
20
WA80 Series Derating Curve
40 60 80 100 120 140 160 180 200 220 240 260 280
Temp°C
Figure 2
All taped resistors will be supplied either on reels or in
ammopacks, depending upon quantities orderded.
c
WA series resistors can be supplied preformed. Contact
factory for details.
Type
b
c
WA82
52
5
WA83
52
5
WA835
52
5
WA84
67
10
WA85
63
10
WA87
85
10
Standard Quantities Per Package
Type
Reel
Large ammo pack
WA82 WA83 WA835 WA84 WA85 WA87
5000 2500 2500 1000 750 700
5000 2500 1500 1000 700 n/a
f₁
6
b
f₂
6
Body Location f₁ – f₂ ≤ 1.4 mm
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: [phone] · Facsimile: [phone] · Email: [e-mail] · Website: www.welwyn-tt.com
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Issue D · 08.04