low cost semi-precision power wirewound resistor las series 1 and 3 wats 0.1 ohm to 18k ohms color band identfcaton 5%, 3%, 1%, .5% tolerance resistance wire tcr 20 ppm/c rohs-compliant version available general note irc reserves the right to make changes in product speci?cation without notice or liability. all information is subject to ircs own data and is considered accurate at time of going to print. a subsidiary of tt electronics plc ? 4222 south staples street ? corpus christi texas 78411 usa wire and film technologies division telephone: 361 992 7900 ? facsimile: 361 992 3377 ? website: www.irctt.com low cost semi-precision power wirewound resistor las series ? 1 and 3 watts ? 0.1 ohm to 18k ohms ? color band identi?cation ? 5%, 3%, 1%, .5% tolerance ? resistance wire tcr 20 ppm/c ? rohs-compliant version available electrical data irc type power rating 275c max. hot spot commercial range (ohms) non-inductive range (ohms) available resistance (ohms) 125c 25c min. max. min. max. 0.5%, 1% 3%, 5% LAS-1 1 2 0.1 7.5k 0.1 3.8k 1 - 7.5k 0.1 - 7.5k las-3 2 3 0.1 18k 0.2 7.5k 1 - 18k 0.1 - 18k test condition (@ 25c) max ?r load life 1000 hours 1.0% moisture resistance 1.0% temperature cycle 0.5% short time overload 0.5% low temperature operation 0.5% solder heat 0.25% shock 0.5% vibration 0.5% environmental data ?ll welded cap and lead heat conductin? ceramic substrate silicone con? or mal coatin? colorband ?ar? in ? ?llo? resistance wirewound to speci?ic parameters includin? tcr?s ?rom 20 to ?5500 ppm/c las series issue october 2008 sheet 1 of 3 las-3 carbon comp replacement (contact factory) the l? s-3 is a three watt con? ormal coated precision wirewound resistor. the resistance wire is welded to the end caps and wound on alumina rod ? or ? ood thermal conductivit? . in circuit applications that utilize two watt carbon comp resistors the l ?s-3 is an idead e?? ective replacement. the l ?s-3 5.6 ohm can be speci?call? desi?ned to withstand 22 jooules o? ener?? delivered b ? a 1000 volt 10 x 1000 usec wave shape pulse. special l?s-3 5.6 ohm to 100 ohm will meet telecom gr-1089 li ?htnin? requirements. ? v = 1000 volts ? t1 = 10 usec rise ? t2 = 1000 usec to v2 ? 10 ohm output impedance microseconds t2 lightning surge t1 0 v2 v ma ke p ossibl e resistors all pb-free parts comply with eu directve 2011/65/eu (rohs2) 07.14 general note tt electronics reserves the right to make changes in product specifcation without notice or liability. all information is subject to tt electronics own data and is considered accurate at time of going to print. ? tt electronics plc www.ttelectronicsresistors.com
low cost semi-precision power wirewound resistor las series ? 4222 south staples street ? corpus christi texas 78411 usa wire and film technologies division telephone: 361 992 7900 ? facsimile: 361 992 3377 ? website: www.irctt.com physical data dimensions (inches (mm)) irc type a 0.032 b (max) c (max) d (lead diameter) e (lead length min) LAS-1 0.348 (8.84) 0.110 (2.80) 0.407 (10.34) 0.020 (0.53) 1.475 (37.5) las-3 0.491 (12.47) 0.149 (3.80) 0.550 (13.99) 0.032 (0.81) 1.35 (34.3) low cost semi-precision power wirewound resistor a c b d e hot spot temperature @ 25c 0 40 80 120 160 200 percent of 25c power hot spot temperature (c) 275 250 200 150 100 25 50 las3 las1 las1 hot spot temperature @ 125c 0 20 40 60 80 100 percent of 125c power rating hot spot temperature (c) 275 250 225 200 175 125 150 las3 las series issue october 2008 sheet 2 of 3 ma ke p ossibl e 07.14 general note tt electronics reserves the right to make changes in product specifcation without notice or liability. all information is subject to tt electronics own data and is considered accurate at time of going to print. ? tt electronics plc www.ttelectronicsresistors.com
low cost semi-precision power wirewound resistor las series ? 4222 south staples street ? corpus christi texas 78411 usa wire and film technologies division telephone: 361 992 7900 ? facsimile: 361 992 3377 ? website: www.irctt.com sample part no. type las power 3 = 3 watts 1 = 1 watt resistance value expressed in ohms (standard eia/mil values) tolerance j = 5%, h = 3%, f = 1%, d = 0.5% lead-free construction ordering data las - 3 2001 j lf pulse-handling capability @ 25c 0.1 0.2 0.5 1 2 5 10 resistance (ohms) energy (watts-second) 12 10 8 6 4 0 2 las3 las1 14 low cost semi-precision power wirewound resistor 25 75 125 175 225 275 200 175 150 125 100 75 ambient temperature (c) percent of 125c power rating power derating curve las3 las1 las series issue october 2008 sheet 3 of 3 ma ke p ossibl e 07.14 general note tt electronics reserves the right to make changes in product specifcation without notice or liability. all information is subject to tt electronics own data and is considered accurate at time of going to print. ? tt electronics plc www.ttelectronicsresistors.com
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