ISO-9001
Registered
GENERAL-PURPOSE
FAILSAFE MOLDED
WIREWOUND RESISTOR
1
3
SP20/SP20F
•
•
•
•
•
•
SERIES
2
4
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
(See notes below.)
Manufactured in Barbados.
SPECIFICATIONS:
IRC Type
EIA RS-344 Style
MIL-R-11 Style
Resistance - Std.
Tolerance - Std.
Power Rating
SP20
CRU 1
RC20/RC32
0.1Ω to 1200Ω
±5%, ±10%
1 watt @ 50°C
3/4 watt @ 70°C
1/2 watt @ 100°C
Derating to 0 @ 160°C
Max. Continuous Working
Voltage
Min. Insulation
Resistance
Min. Dielectric
Dry
Wet
ATM
√PR
10,000 Meg
100 Meg
700 V
450V
120°C @ 1 watts
5%
Negligible
SP20F
CRU 1
RC20/RC32
0.1Ω to 1000Ω
±5%, ±10%
1 watt @ 50°C
3/4 watt @ 70°C
---
Derating to 0 @ 160°C
√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 substrate.
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 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 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
designate wirewound construction. A fifth
band, blue in color, is used for flameproof
identification.
Withstanding Volts
(RMS)
Reduced Pressure
Hotspot Temperature Rise
Typical Load Life
Current Noise
DIMENSIONS
(Inches and (mm)):
A
B
IRC Type
±0.010 (.25)
±0.008 (.20)
SP20
0.390 (9.91)
0.140 (3.56)
SP20F
0.390 (9.91)
0.140 (3.56)
0.032 (.813)
D
A
B
C
C
±0.002 (.05)
0.032 (.813)
1.50 (38.1)
D
±0.126 (3.2)
1.50 (38.1)
NOTE:
Unless specified otherwise standard test centers are 1 3/4 inches.
WIRE AND FILM TECHNOLOGIES
736 Greenway Road · PO Box 1860
·
Boone, North Carolina 28607-1860
·
Tel: 704-264-8861
·
Fax: 704-264-8865
1
ISO-9001
Registered
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:
2.5
2.0
1.5
1.0
0.5
0
SP-20F POWER DERATING:
2.5
2.0
SP-20F TYPICAL FUSING:
25
20
15
10
8
6
4
2
0
0
20
40
60
80
Power (watts)
Power (watts)
1.5
1.0
0.5
00
50
100
150
200
Power (watts)
0.1 ohm
1 ohm
10 ohm
100 ohm
1000 ohm
0
50
100
150
200
100
Ambient Temperature (°C)
Ambient Temperature (°C)
Time (seconds)
SP-20 AND SP-20F
TEMPERATURE RISE:
120
100
HOW TO ORDER:
Sample Part No.:
Ω
SP-20 150Ω 5%
Power (watts)
80
60
40
IRC Type
Power
Resistance Range
20
0
0
Tolerance
0.5
1.0
1.5
2.0
Power Input (watts)
WIRE AND FILM TECHNOLOGIES
736 Greenway Road · PO Box 1860
·
Boone, North Carolina 28607-1860
·
Tel: 704-264-8861
·
Fax: 704-264-8865
2
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