Failsafe Molded
Wirewound Resistor
SP20 / SP20F Series
·
·
·
·
·
·
·
·
SP20F UL1412 recognised fusing *
0.1 ohm to 1200 ohms
F version has flame resistant coating
1 watt rated with 1/2 watt dimensions
Drop-in replacement BW20 / BW20F
Weldable and solderable magnetic lead
TCR’s as low as ±150 ppm/°C standard
(custom TC’s available)
Lead free, RoHS compliant construction available
3
1
4
2
(See notes below)
* UL file number E234469
Electrical Data
IRC Type
SP20
SP20F
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 the SP20F 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.
EIA RS-344 Style
MIL-R-11 Style
Resistance - Std.
UL Recognised Range
Tolerance - Std.
CRU1
RC20/RC32
0.1 to 1200
---
CRU1
RC20/RC32
0.1 to 1000
1 to 470
±5% (E24), ±10% (E12)
1 watt @ 50°C
1 watt @ 50°C
3/4 watt @ 70°C
3/4 watt @ 70°C
---
1/2 watt @ 100°C
Derating to 0 @ 160°C Derating to 0 @ 160°C
Power Rating
Max. Continuous Working Voltage
Min. Insulation
Resistance
Min. Dielectric
Withstanding Volts
(RMS)
Reduced Pressure
Dry
Wet
ATM
PR
10,000 Meg
100 Meg
700V
450V
120°C @ 1 watts
5%
Negligible
PR
10,000 Meg
100 Meg
700V
450V
120°C @ 1 watts
5%
Negligible
Hotspot Temperature Rise
Typical Load Life
Current Noise
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
10.12
SP20 / SP20F Series
Failsafe Molded
Wirewound
Purpose Failsafe
General
Resistor
Molded Wirewound
SP20 / SP20F Series
Environmental Data
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
Resistor
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
Physical Data
D
A
B
C
Dimensions (Inches and (mm))
IRC Type
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)
SP20
SP20F
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
SP20/SP20F Series Issue September 2010 Sheet 2 of 3
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
10.12
SP20 / SP20F Series
Failsafe Molded
General
Resistor
Wirewound
Purpose Failsafe
SP-20 Power Derating Curve
2.5
2.0
Power (watts)
Molded Wirewound Resistor
SP20 / SP20F Series
SP-20F Power Derating Curve
2.5
2.0
Power (watts)
1.5
1.0
0.5
0
0
50
100
150
200
1.5
1.0
0.5
0
0
50
100
150
200
Ambient Temperature (°C)
Ambient Temperature (°C)
SP-20 and SP20F
Temperature Rise Chart
120
Temperature Rise (°C)
1000
SP20F Fusing Characteristic
(Maximum & Typical Fusing Times)
Maximum - all values
100
80
60
40
20
0
0
0.5
1.0
1.5
2.0
Fusing Time (s)
100
Typical
- 1R0
10
Typical
- 470R
1
Power Input (watts)
0.1
10
15
20
25
30
35
Initial Power (W)
40
45
50
55
60
Note: After fusing the ohmic value is at least 100 times the initial value, provided initial power ≥ 20W is applied.
Ordering Data
Sample Part No.
IRC Type
Recognition
UL = UL1412 recognised (optional characters)
SP20F
1800
J
LF
XXX
(First three significant figures plus fourth digit multiplier)
Example: 2203 = 220 Kohm
51R0 = 51 ohm
2R00 = 2.0 ohm
Resistance Range
Tolerance
F = ±1.0%, G = ±2.0%, J = ±5.0%
RoHS Compliant (optional)
Specification
Provides clear "Lead Free" Designation
Custom design identifier for non-standard products
Wire and Film Technologies Division
T
:
F
:
W
:
T
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
10.12
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