SPH Datasheet, PDF (1/2 Pages) Welwyn Components Limited – General-Purpose Failsafe Moulded Wirewound Resistors

General-Purpose Failsafe
Moulded Wirewound Resistors Welwyn Components
SPH/SPF Series
• Drop-in replacement for BWH/BWF
• ^{2 watt rated with 1 watt dimensions}
• ^{±5%, ±10% tolerance}
• ^{0.1 ohm to 2400 ohms}
• ^{TCR’s as low as ±150 ppm/°C standard}
(custom TC’s available)
• ^{Weldable and solderable leads}
Electrical Data
Type
EIA RS-344 Style
MIL-R-11 Style
Resistance
Tolerance
Power rating
Maximum continuous working voltage
Minimum insulation resistance
Minimum dielectric withstanding volts
Reduced pressure
Hotspot temperature rise
Current noise
ohms
%
watts
dry
wet
ATM
RMS
watts
SPH
SPF
CRU2
RC32/RC42
0R1 to 2k4
0R1 to 1k
±5, ±10
2 at 70°C
1 at 115°C
Derating to 0 at 160°C
√PR
10,000 Meg
100 Meg
1000V
625V
145°C at 2 watts
Negligible
Physical Data
Dimensions (mm)
Type
L
SPH
14.3 ±0.25
SPF
14.3 ±0.25
D
5.72 ±0.20
5.72 ±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.
Encapsulation
The SPH and SPF are encapsulated utilizing a compression
moulded phenolic plastic material. The SPF has a flame-
resistance coating applied over the resistive element to provide
flammmability protection when destructive overloads may occur.
Termination
The SPH and SPF 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.
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.
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
© Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK
Telephone: [phone] · Facsimile: [phone] · Email: [e-mail] · Website: www.welwyn-tt.com
A subsidiary of
TT electronics plc
Issue B · 03.02
93