general note a subsidiary of tt electronics plc advanced film division ? 4222 south staples street ? corpus christi texas 78411 usa telephone: 361 992 7900 ? facsimile: 361 992 3377 ? website: www.irctt.com sc3 series issue july 2008 irc reserves the right to make changes in product specification without notice or liability . all information is subject to ircs own data and is considered accurate at time of going to print. high power dissipation smt chip resistor ? tolerances to 1% ? 3 watt rating at 70c ? resistance range from 1 to 100k ? ? standard sn/pb and matte tin (pb-free) terminations available sc3 series electrical data power derating chart _____ resistance range 1 ? to 100k ? resistance tolerance 1%, 2%, 5% temperature coeffcient 100 ppm/c power dissipation 3.0 watts* @70c maximum voltage rating (not to exceed p x r ) 100 volts operating temperature range -55c to +150c termination leach-resistant nickel barrier under solder-plated wrap- around *note: with 1 square copper area as heat spreader. physical data 25 70 150 100 50 10 % of rated po wer t emperature in c 0.090? .0 05? 0.032? .0 05? plating wrap-around 0.030? .0 05? thic kness bo tt om (b oard side) 0.250? .0 05? 0.1 25? .0 05? to p 0.020?.0 05? 0.30? 7 .6mm 0.04? (1mm) 0.08? (2.0mm) recommended solder p ad la y out schema tic 33r0 top bottom recommended solder pad layout schematic
sc3 series issue july 2008 advanced film division ? 4222 south staples street ? corpus christi texas 78411 usa telephone: 361 992 7900 ? facsimile: 361 992 3377 ? website: www.irctt.com temperature rise vs pad area pulse power rating high power dissipation smt chip resistor 100mm 2 1000mm 2 10 100 1000 t emper ature rise (c) 200mm 2 te r mination p ad area (each end) 1 w att 2 w atts 3 w atts time (sec) 100 10 1 0.1 1.0 10.0 po wer (w atts)
sc3 series issue july 2008 advanced film division ? 4222 south staples street ? corpus christi texas 78411 usa telephone: 361 992 7900 ? facsimile: 361 992 3377 ? website: www.irctt.com ordering data prefx scw - sc3lf - 33r0 - f model sc3 = 3 watt chip with standard sn/pb termination sc3lf = 3 watt chip with matte tin (pb-free) termination resistance code standard 4-digit resistance code example: 33r0 = 33 ? ; 10k0 = 10,000 ? resistance tolerance code j = 5%; g = 2%; f = 1% packaging available in both bulk and tape & reel. environmental data for additional information or to discuss your specific requirements, please contact our applications team using the contact details below. environmental test test method specifcation thermal shock mil-std-202 method 107 condition b, -65c + 125c ? r 0.5% + 0.01 ? short-time overload 2x rated power for 5 seconds ? r 0.5% + 0.01 ? high temperature exposure 100 hours, 150c ? r 0.5% + 0.01 ? moisture resistance mil-std-202 method 106 ? r 0.5% + 0.01 ? load life rated power @ 70c for 1000 hours; 1.5 hours on, 0.5 hours off ? r 1.0% + 0.01 ? low temperature operation 1 hour @ -65c followed by rated power for 45 minutes ? r 0.5% + 0.01 ? resistance to solder heat mil-std-202 method 210 260c, 5 seconds ? r 0.25% + 0.01 ? solderability mil-std-202 method 208 245c, 5 seconds 95% coverage high power dissipation smt chip resistor
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