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 20 ? ultra low resistance values (0.005 ? to 0.1 ? ) ? available in 1-watt, 3-watt and 5-watt rated packages ? tolerances from 1% to 5% ? inherently non-inductive ( .02h @ 0.5mhz) ? low temperature coef?cient of resistance ? high stability over life ? lead free rohs compliant construction available wirewound and film technologies division 736 greenway road ? boone, north carolina 28607-1860 ? tel: 828-264-8861 ? fax: 828-264-8866 ? www.irctt.com description: 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: lob ? series resistors feature tinned copper leads welded directly to a low-temperature coefficient resistance element in a highly au - tomated proprietary process. the leaded resistor elements are then encapsulated in a molding com - absolute maximum ratings: *power dissipation - the maximum wattage rating depends upon the amount of heat which can be transferred to the surroundings while 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 this transfer, and must be taken into account when general specifications - environmental testing*: *0.0005 ohm allowance for test/contact error. low resistance metal element resistor lob series mil-std 202 method 108 method 107 method 204 method 213 method 301 method 302 test parameters load life (2,000 hours) thermal shock vibration mechanical shock dielectric strength insulation resistance max % ? r * 1% 1% 0.5% 0.5% 0.5% >10 11 unit % ? r % ? r % ? r % ? r % ? r ohms characteristic lob-1 1 5 1xr 175 lob-3 3 15 3xr 175 lob-5 5 25 5xr 175 units watts watts volts c continuous power dissipation @ 25c in free air overload power for 5 seconds maximum working voltage maximum storage temperature
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 21 wirewound and film technologies division 736 greenway road ? boone, north carolina 28607-1860 ? tel: 828-264-8861 ? fax: 828-264-8866 ? www.irctt.com power derating percentage vs. free air ambient temperature: temperature coefficient of resistance vs. resistance value: lob-1 lob-3 lob-5 resistance (ohms x 10 -3 ) ambient temperature (c) percentage rated power temperature coef?cient of resistance (ppm/c) how to order: to order, specify style, resistance value, tolerance and package type as in the following example: lob-3 0.0 1 w 1 % l f lt stylepackaging lt (lead tape) 500 pcs. min. lob-1 (1 watt) lob-3 (3 watt) lob-5 (5 watt) resistance value 0.005 w 0.02 w 0.04 w 0.08 w 0.01 w 0.025 w 0.05 w 0.1 w 0.015 w 0.03 w 0.07 w contact factory for other values tolerance 5%, 3%, 1% - all styles/values packaging lt (lead tape) 500 pcs. min. lob-1 3500pcs. max lob-3 1250 pcs. max. lob-5 800 pcs. max. blk (bulk pack) 500/box packed loose in box i 1.50 0.125 (38.1 3.2) 1.375 0.125 (34.925 3.175) 1.250 0.125 (31.750 3.175) lob dimensions (inches and (mm)) : style lob-1 lob-3 lob-5 l 0.390 0.010 (9.9 0.3) 0.560 0.010 (14.224 0.254) 0.920 0.010 (23.368 0.254) d 0.140 0.008 (3.6 0.2) 0.210 0.010 (5.334 0.254) 0.330 0.010 (8.382 0.254) c 1.31 (33.274) 1.31 (33.274) 1.670 (42.418) d 0.0305 0.002 (0.813 0.051) 0.0305 0.002 (0.813 0.051) 0.040 0.002 (1.016 0.051) connect point connect point l d c i d lead-free construction
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