Low-Cost General Purpose Conformal Coated Wirewound Resistor SPP Series Alloy resistance wirewound on fiberglass core Mechanically crimped termination assembly • Coated or uncoated units • Positive high TC’s upon request • Color band standard identification • Lower ranges available - contact factory EIA/MIL color code: first wide band indicates wirewound construction, blue indicator indicates flameproof • Weldable and solderable magnetic leads Electrical Data IRC Type SPP-1 SPP-2 SPP-3 0.1Ω to 1200Ω 0.1Ω to 2400Ω 0.1Ω to 2400Ω ±5%, ±10% ±5%, ±10% ±5%, ±10% Power Rating 1 watt @ 85°C 3/4 watt @ 105°C 1/2 watt @ 125°C Derating to 0 @ 160°C 2 watt @ 85°C 1 watt @ 140°C ----- 3 watt @ 85°C 2 watt @ 145°C 1 watt @ 190°C --- Load Life Stability 1 watt @ 85°C ± 10% 2 watt @ 85°C ± 10% 3 watt @ 85°C ± 10% √PR √PR √PR 10,000 Meg 100 Meg 10,000 Meg 100 Meg 10,000 Meg 100 Meg 600V 600V 600V Negligible Negligible Negligible Approx. 150°C Approx. 200°C Approx. 225°C Resistance - Std. Tolerance - Std. Max. Continuous Working Voltage Min. Insulation Dry Resistance Wet Min. Dielectric Withstanding Volts (RMS) Current Noise Temperature Rise at Rated Load, 25°C Ambient Temperature Coefficient ±600/°C 0.10Ω - 0.91Ω ±300/°C 1Ω - 1200Ω ±600/°C 0.10Ω - 0.91Ω ±300/°C 1Ω - 2400Ω ±600/°C 0.10Ω - 0.91Ω ±300/°C 1Ω - 2400Ω Notes: Unless specified otherwise, standard test centers are 1 ¾ 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. 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 SPP Series Issue December 2008 Sheet 1 of 3 Low-Cost General Purpose Conformal Coated Wirewound Resistor Environmental Data Characteristics Maximum Limits Temperature Coefficient (ppm/°C) SPP-1 ±600/°C ±300/°C 0.10Ω - 0.91Ω 1.0Ω - 1200Ω SPP-2 ±600/°C ±300/°C 0.10Ω - 0.91Ω 1.0Ω - 2400Ω SPP-3 ±600/°C ±600/°C 0.10Ω - 0.91Ω 1.0Ω - 2400Ω Thermal Shock ±5% Low Shock ±5% Short Time Overload ±5% Commercial Short Time Overload ±5% Resistance to Solder Immersion ±3% Solderability 95% minimum coverage Moisture Resistance ±5% Life Test ±5% Test Method EIA Specification RS-344 Physical Data A max. C B 1.125 min. Dimensions (Inches and (mm)) IRC Type A B C ± .002 SPP-1 0.400 max. 0.148 max. 0.032 SPP-2 0.570 max. 0.170 max. 0.032 SPP-3 0.570 max 0.170 max. 0.032 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 SPP Series Issue December 2008 Sheet 2 of 3 Low-Cost General Purpose Conformal Coated Wirewound Resistor Power Derating Curve Temperature Rise Curve 300 80 Temperature Rise (°C) Percent Rated Power 100 SPP-3 60 SPP-1, 2 40 20 0 0 50 100 150 200 250 300 SPP-3 200 SPP-2 100 SPP-1 Ambient Temperature (°C) 0 0 20 40 60 80 100 Percent Rated Power Ordering Data Sample Part No. SPP 1 1001 J IRC Type Power (See Electrical Data chart for other power ratings) Resistance Value Expressed in ohms (Standard EIA/MIL values) Tolerance J = ±5%, K = ±10% standard 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 SPP Series Issue December 2008 Sheet 3 of 3