General Purpose Failsafe
Molded Wirewound Resistor
SPH/SPF Series
•
•
•
•
•
•
•
•
SPF is fusible
±5%, ±10% tolerance
0.1 ohm to 2400 ohms
Weldable and solderable leads
2 watt rated with 1 watt dimensions
Drop-in replacement for BWH/BWF
Lead free, RoHS compliant construction available
TCR’s as low as ±150 ppm/°C standard (custom TC’s available)
3
1
4
2
(See notes below)
Electrical Data
IRC Type
SPH
SPF
1. Resistive Element
All resistor types have resistance alloy
winding on a braided fiberglass substrate.
Intermediate silicone coatings are used
to enhance processibility and to provide
protection to the resistive element.
2. 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.
3. Encapsulation
The SPH and the SPF are encapsulated uti-
lizing a compression molded phenolic plastic
material. The SPF has a flame resistance
coating applied over the resistive element
to provide flammability protection when
destructive overloads may occur.
4. Marking
All products are marked utilizing heat and
solvent resistant color code bands consistent
with EIA/MIL requirements. The first band
is double width to designate wirewound
construction. A fifth band, blue in color, is
used for flameproof identification.
EIA RS-344 Style
MIL-R-11 Style
Resistance - Std.
Tolerance - Std.
Power Rating
Max. Continuous Working Voltage
Min. Insulation
Resistance
Min. Dielectric
Withstanding Volts
(RMS)
Reduced Pressure
Dry
Wet
ATM
CRU2
RC32/RC42
0.1Ω to 2400Ω
±5%, ±10%
CRU2
RC32/RC42
0.1Ω to 1000Ω
±5%, ±10%
2 watt @ 70°C
2 watt @ 70°C
1 watt @ 115°C
1 watt @ 115°C
Derating to 0 @ 160°C Derating to 0 @ 160°C
√
PR
10,000 Meg
100 Meg
1000V
625V
145°C @ 2 watts
5%
Negligible
√
PR
10,000 Meg
100 Meg
1000V
625V
145°C @ 2 watts
5%
Negligible
Hotspot Temperature Rise
Typical Load Life
Current Noise
General Note
IRC reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own data and is considered accurate at time of going to print.
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
A subsidiary of
TT electronics plc
SPH/SPF Series Issue December 2008 Sheet 1 of 3
General Purpose Failsafe
Molded Wirewound Resistor
Environmental Data
Test
SPH
0.1Ω - 0.16Ω ± 1000
0.18Ω - 0.68Ω ± 800
0.75Ω - 2400Ω ± 400
1000V
5%
5%
5%
5%
5%
5%
5%
No Failures
SPF
0.10Ω ± 1700
0.11Ω - 0.16Ω ± 1000
0.18Ω - 0.68Ω ± 800
0.75Ω - 1000Ω ± 400
1000V
5%
5%
5%
5%
5%
5%
5%
No Failures
Temperature Coefficient (ppm)*
Dielectric Withstanding Voltage (RMS)
Momentary Overload
Low Temperature Operation
Temperature Cycle
Humidity
Load Life
Terminal Strength
Resistance to Solder Heat
Solderability
Physical Data
D
A
B
C
Dimensions (Inches and (mm))
IRC Type
A
0.562 ± 0.010
(14.3 ± 0.25)
0.562 ± 0.010
(14.3 ± 0.25)
B
0.225 ± 0.008
(5.72 ± 0.20)
0.225 ± 0.008
(5.72 ± 0.20)
C
0.032 ± 0.002
(0.813 ± 0.05)
0.032 ± 0.002
(0.813 ± 0.05)
D
1.50 ± 0.126
(38.1 ± 3.2)
1.50 ± 0.126
(38.1 ± 3.2)
SPH
SPF
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
SPH/SPF Series Issue December 2008 Sheet 2 of 3
MCU
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