SP20/SP20F SERIES
GENERAL-PURPOSE FAILSAFE
MOLDED WIREWOUND RESISTOR
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SP20F is Fusible and has flame resistant coating
Drop-in replacement for BW20/BW20F
1 watt rated with 1/2 watt dimensions
±5%, ±10% tolerance
0.1 ohm to 1200 ohms
TCR's as low as ±150 ppm/°C standard (custom TC's available)
Weldable and solderable magnetic leads
Lead-/free, ROHS Compliant Construction Available
3
1
4
2
(See notes below.)
SPECIFICATIONS:
IRC Type
EIA RS-344 Style
Resistance - Std.
Tolerance - Std.
Power Rating
SP20
CRU 1
SP20F
CRU 1
0.1Ω to 1200Ω
0.1Ω to 1000Ω
±5%, ±10%
±5%, ±10%
1 watt @ 50°C
1 watt @ 50°C
3/4 watt @ 70°C
3/4 watt @ 70°C
1/2 watt @ 100°C
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Derating to 0 @ 160°C Derating to 0 @ 160°C
√PR
Dry
Wet
ATM
10,000 Meg
100 Meg
700 V
450V
120°C @ 1 watts
5%
Negligible
√PR
10,000 Meg
100 Meg
700 V
450 V
120°C @ 1 watts
5%
Negligible
1. Resistive Element
All resistor types have resistance alloy
winding on a braided fiberglass sub-
strate. Intermediate silicone coatings
are used to enhance processibility and
to provide protection to the resistive
element.
2. Termination
The SP-20 and SP-20F resistors are
terminated using an alloy coated cop-
per flashed steel lead welded to a cap
of the same material. This termination
assembly is mechanically crimped, uti-
lizing an improved crimp design, to the
resistive element.
3. Encapsulation
The SP-20 and SP-20F are encapsulated
utilizing a compression molded phenolic
plastic material. The SP-20F 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 des-
Max. Continuous
Working Voltage
Min. Insulation
Resistance
Min. Dielectric
Withstanding
Reduced
Volts(RMS)
Pressure
Hotspot Temperature Rise
Typical Load Life
Current Noise
DIMENSIONS (Inches and (mm)):
IRC TYPE
SP20
SP20F
A
0.390±0.010
(9.91±0.25)
0.390±0.010
(9.91±0.25)
B
0.140±0.008
(3.56±0.20)
0.140±0.008
(3.56±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)
*Unless otherwise specified, standard test centers are 1 3/4 inches.
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.
WIREWOUND AND FILM TECHNOLOGIES DIVISION
736 Greenway Road • Boone, North Carolina 28607-1860 • Tel: 828-264-8861 • Fax: 828-264-8866 • www.irctt.com
A subsidiary of TT electronics
1005
SP20/SP20F CHARACTERISTICS (TYPICAL PERFORMANCE):
Test
Temperature Coefficient (ppm) *
Dielectric Withstanding Voltage (RMS)
Momentary Overload
Low Temperature Operation
Temperature Cycle
Humidity
Load Life
Terminal Strength
Resistance to Solder Heat
Solderability
*0.1 ohm SP20F <1000 ppm.
SP20
<1R <±800
≥1R
<±150
700V
5%
5%
5%
5%
5%
5%
5%
No Failures
SP20F
<1R <±800*
≥1R
<±150
700V
5%
5%
5%
5%
5%
5%
5%
No Failures
SP-20 POWER DERATING:
Power (watts)
Power (watts)
SP-20F POWER DERATING:
Power (watts)
Ambient Temperature
SP-20F TYPICAL FUSING:
Ambient Temperature
Time (seconds)
SP-20 AND SP-20F
TEMPERATURE RISE:
Temperature Rise (°C)
HOW TO ORDER:
Sample Part No.:
SP-20 150Ω 5% LF
IRC Type
Power
Resistance Range
Tolerance
Power Input (watts)
Lead Free Construction
© IRC, Inc.
NOTE: Unless specified otherwise standard test centers are 1 3/4 inches.
WIREWOUND AND FILM TECHNOLOGIES DIVISION
A subsidiary of TT electronics
1005
736 Greenway Road • Boone, North Carolina 28607-1860 • Tel: 828-264-8861 • Fax: 828-264-8866 • www.irctt.com
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