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 EIA RS-344 Style MIL-R-11 Style Resistance - Std. Tolerance - Std. SPH SPF CRU2 CRU2 RC32/RC42 RC32/RC42 0.1Ω to 2400Ω 0.1Ω to 1000Ω ±5%, ±10% ±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 Power Rating Max. Continuous Working Voltage Min. Insulation √PR √PR Resistance Dry Wet 10,000 Meg 100 Meg 10,000 Meg 100 Meg Min. Dielectric ATM 1000V 1000V Reduced Pressure 625V 625V 145°C @ 2 watts 145°C @ 2 watts 5% 5% Negligible Negligible Withstanding Volts (RMS) Hotspot Temperature Rise Typical Load Life Current Noise 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 utilizing 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. 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 SPF 0.1Ω - 0.16Ω ± 1000 0.18Ω - 0.68Ω ± 800 0.75Ω - 2400Ω ± 400 0.10Ω ± 1700 0.11Ω - 0.16Ω ± 1000 0.18Ω - 0.68Ω ± 800 0.75Ω - 1000Ω ± 400 1000V 1000V Momentary Overload 5% 5% Low Temperature Operation 5% 5% Temperature Cycle 5% 5% Humidity 5% 5% Load Life 5% 5% Terminal Strength 5% 5% Resistance to Solder Heat 5% 5% No Failures No Failures Temperature Coefficient (ppm)* Dielectric Withstanding Voltage (RMS) Solderability Physical Data D A B C Dimensions (Inches and (mm)) IRC Type SPH SPF A B C D 0.562 ± 0.010 (14.3 ± 0.25) 0.225 ± 0.008 0.032 ± 0.002 1.50 ± 0.126 (5.72 ± 0.20) (0.813 ± 0.05) (38.1 ± 3.2) 0.562 ± 0.010 0.225 ± 0.008 0.032 ± 0.002 1.50 ± 0.126 (14.3 ± 0.25) (5.72 ± 0.20) (0.813 ± 0.05) (38.1 ± 3.2) 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 General Purpose Failsafe Molded Wirewound Resistor SPF Power Derating Curve 2.5 2.5 2.0 2.0 Power (watts) Power (watts) SPH Power Derating Curve 1.5 1.0 0.5 0 0 50 70 100 1.5 1.0 0.5 0 150 160 200 0 SPF Typical Fusing 150 200 SPH and SPF Temperature Rise Chart 25 150 0.1 ohm 1 ohm 15 10 ohm 10 100 ohm 1000 ohm 5 0 20 40 60 80 100 Time (seconds) Temperature Rise (°C) 20 Power (watts) 100 Ambient Temperature (°C) Ambient Temperature (°C) 2 0 50 70 125 100 75 50 25 0 0 0.5 1.0 1.5 2.0 Power Input (watts) Ordering Data Sample Part No. SPH 1500 J LF IRC Type Resistance Range Tolerance J = 5%, K = 10% Lead Free Construction 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 3 of 3