SP20 Datasheet, PDF (1/3 Pages) Welwyn Components Limited – General-Purpose Failsafe Moulded Wirewound Resistors

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Moulded Wirewound Resistors
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F version has flame resistant coating
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TCR’s as low as ±150 ppm/°C standard (custom TC’s available)
Lead free, RoHS compliant construction available
* UL file number E234469
All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2)
Electrical Data
Type
EIA RS-344 Style
MIL-R-11 Style
Resistance Range
UL Recognised Range
Tolerance
Power rating
Maximum continuous working voltage
Minimum insulation resistance
Minimum dielectric withstanding volts
Reduced pressure
Hotspot temperature rise
Current noise
ohms
ohms
%
watts
dry
wet
ATM
RMS
SP20
0R1 to 1k2
CRU 1
RC20/RC32
SP20F
0R1 to 1k
N/A
1R0 to 470R
±5, ±10
1 at 50°C
1 at 50°C
0.75 at 70°C
0.75 at 70°C
0.5 at 100°C
-
Derating to 0 at 160°C
Derating to 0 at 160°C
√PR
10,000 Meg
100 Meg
700V
450V
120°C at 1 watt
Negligible
Physical Data
Dimensions (mm)
Type
L
SP20
9.91±0.25
SP20F
9.91±0.25
D
3.56±0.20
3.56±0.20
d
0.813±0.05
0.813±0.05
f
38.1±3.2
38.1±3.2
dD
L
f
Resistive Element
All resistor types have resistance alloy winding on a braided
fibreglass substrate. Intermediate silicone coatings are used to
enhance processibility and to provide protection to the
resistive element.
Termination
The SP20 and SP20F resistors are terminated using an alloy
coated copper flashed steel lead welded to a cap of the same
material. This termination assembly is mechanically crimped,
utilizing an improved crimp design, to the resistive element.
Encapsulation
The SP20 and SP20F are encapsulated utilizing a compression
molded phenolic plastic material. The SP20F has a flame
resistance coating applied over the resistive element to
provide flammmability protection when destructive overloads
may occur.
Marking
All products are marked utilizing heat and solvent resistant
colour code bands consistent with EIA/MIL requirements. The
first band is double width to designate wirewound
construction. A fifth band, blue in colour, is used for
flameproof identification.
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© Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK
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Issue B · 03.02
07.14
95