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SP20/SP20F SERIES
GENERAL-PURPOSE FAILSAFE MOLDED WIREWOUND RESISTOR
* * * * * * * * 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
0.1 to 1200 0.1 to 1000 5%, 10% 5%, 10% 1 watt @ 50C 1 watt @ 50C 3/4 watt @ 70C 3/4 watt @ 70C 1/2 watt @ 100C --Derating to 0 @ 160C Derating to 0 @ 160C PR 10,000 Meg 100 Meg 700 V 450V 120C @ 1 watts 5% Negligible PR 10,000 Meg 100 Meg 700 V 450 V 120C @ 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 flameresistance 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 Dry Resistance Wet Min. Dielectric ATM Withstanding Reduced Volts(RMS) Pressure Hotspot Temperature Rise Typical Load Life Current Noise
DIMENSIONS (Inches and (mm)):
IRC TYPE SP20 SP20F
A
0.3900.010 (9.910.25) 0.3900.010 (9.910.25)
B
0.1400.008 (3.560.20) 0.1400.008 (3.560.20)
C
0..0320.002 (0.8130.05) 0.0320.002 (0.8130.05)
D
1.500.126 (38.13.2) 1.500.126 (38.13.2)
*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-20 150 5% LF
IRC Type Power Resistance Range Tolerance Power Input (watts) Lead Free Construction
(c) 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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