general note irc reserves the right to make changes in product speci cation without notice or liability. all information is subject to irc s 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 resistance metal element resistor environmental testing lob series ? low tcr ? high stability over life ? tolerances from 1% to 5% ? ultra low resistance values (0.005 to 0.1 ) ? inherently non-inductive ( .02 h @ 0.5 mhz) ? available in 1w, 3w, and 5w rated packages ? lead free rohs compliant construction available test parameters mil-std 202 max % r * unit load life (2,000 hours) method 108 1% % r thermal shock method 107 1% % r vibration method 204 0.5% % r mechanical shock method 213 0.5% % r dielectric strength method 301 0.5% @1000 vac % r insulation resistance method 302 >10 10 @ 100 vdc ohms description: the lob series power precision metal element resistors feature resistance values down to 0.005 with virtually no inductance. available in 1, 3, and 5 watt rated axial leaded packages, these resistors are compatible with automatic insertion equipment. applications: ? switchmode and linear power supplies ? automotive current-sensing circuits ? instrumentation ? regulators construction: the lob series resistors feature tinned copper leads welded directly to a low-temperature coef? cient resistance element in a highly automated proprietary process. the leaded resistor elements are then encapsulated in a molding compound. speci? cations *0.0005 ohm allowance for test/contact error. *power dissipation - the maximum wattage rating depends upon the amount of heat which can be transferred to the surroundings wh ile not exceeding the maximum element temperature. ambient air temperature, velocity of cooling air, thermal resistance of heat, and the temperature of surrounding objects will affect th is transfer, and must be taken into account when selecting a resistor. style continuous power dissipation @ 25c in free air (watts) overload power for 5 seconds (watts) maximum working voltage (volts) maximum storage temperature (c) lob-1 1 5 1 x r 175 lob-3 3 15 3 x r 175 lob-5 5 25 5 x r 175 lob series issue december 2009 sheet 1 of 3
?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 l d l c connect point d connect point dimensions (inches (mm)) style l d c l d lob-1 0.390 0.010 (9.9 0.3) 0.140 0.008 (3.6 0.2) 1.31 (33.274) 1.50 0.125 (38.1 3.2) 0.0305 0.002 (0.813 0.051) lob-3 0.560 0.010 (14.224 0.254) 0.2100 0.010 (5.334 0.254) 1.31 (33.274) 1.375 0.125 (34.925 3.175) 0.0305 0.002 (0.813 0.051) lob-5 0.920 0.010 (23.368 0.254) 0.330 0.010 (8.382 0.254) 1.670 (42.418) 1.250 0.125 (31.750 3.175) 0.040 0.002 (1.016 0.051) low resistance metal element resistor physical data power derating percentage vs. free air ambient temperature: 100 75 50 25 0 0 25 50 75 100 125 150 175 ambient temperature (c) temperature coef? cient of resistance vs. resistance value 400 300 200 100 0 0 25 50 75 100 resistance (ohms x 10 -3 ) tcr (ppm/c) lob-1 lob-3 lob-5 lob series issue december 2009 sheet 2 of 3
?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. irc type lob-1 (1 watt) lob-3 (3 watt) lob-5 (5 watt) resistance value 0.005 0.02 0.04 0.08 0.01 0.025 0.05 0.1 0.015 0.03 0.07 tolerance j = 5%, h = 3%, f = 1% lead-free rohs compliant packaging lt = lead tape, 500 pcs. min. lob-1 = 3,500 pcs. max. lob-3 = 1,250 pcs. max. lob-5 = 800 pcs. max. blk = bulk pack, 500/box ordering data lob-3 r010 f lf lt to order, specify style, resistance value, tolerance, and package type as in the following example: low resistance metal element resistor lob series issue december 2009 sheet 3 of 3
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