Low Resistance Metal Low Resi stance Metal Resistors Welwyn Components Element Resistor s Low R esistance Metal Low Resistance Metal Welwyn Components E lement Resi stors Welwyn Components Element R esistors Element Resistors Low Resistance Metal LOB Serie s LOB S eries Element Resistors LOB Series Ultra low resistance values LOB S eries (0.005 to 0.1) Ultralowresistancevalues Ultra low resistance values LOB Series Ultralowresistancevalues (0.005 to0.1) Available in 1, 3 and 5 watt rated packages (0.005 to 0.1 ) (0.005Ultra low resitostance 0.1 values) Availablein 1,3 and5 wattratedpackages Available in 1, 3 and 5 watt rated packages Tolerances from 1% to 5% (0.005 to 0.1) Availablein 1,3 and5 wattratedpackages Tolerances fTolerancesrom 1% to 5%from1%to5% Inherently non-inductive (.02H at 0.5MHz) Available in 1, 3 and 5 rated packages Tolerancesfrom1%to5% Inherently non-inductive ( .02H at 0.5MHz) Inherentlynon-inductive( .02Hat0.5MHz) Low temperature coefficient of resistance Tolerances from 1% to 5% InheLow temperaturentlynon-inductivere coefcient of ( .02Hresistanceat0.5MHz) Lowtemperature coe ofresistance Inherently (.02H at 0.5MHz) High stability over life High stability over life Lowtemperature coe ofresistance Highstabilityoverlife Lowtemperature of resistance Highstabilityoverlife over life High stability All Pb-free parts comply with EU 2011/65/EU (RoHS2) Electrical Data E lectrical Data E lectrical Data LOB-1 LOB-3 LOB-5 LOB-1 LOB-3 LOB-5 Continuous power dissipation at 25C in free air watts 1 3 5 LOB-1 LOB-3 LOB-5 Continuous power dissipation at 25Cin free air watts 1 3 5 Overload power for 5 seconds watts 5 15 25 Continuous power dissipation at 25Cin free air watts 1 3 5 Overload power for 5 seconds watts 5 15 25 Maximum working voltage volts 1xR 3xR 5xR Overload power for 5 seconds watts 5 15 25 Maximum working voltage volts 1xR 3xR 5xR Operating temperature C -55 to 175 -55 to 175 -55 to 175 Maximum working voltage volts 1xR 3xR 5xR Maximum storage temperature C 175 175 175 * 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 Operating temperature C -55 to 175 *Power Dissipation - The maximum wattage rating depends upon the amount of heat which can be transferred to the surroundings w hile 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, this must be taken temperature. Ambient air temperature, velocity of cooling air, thermal resistance of heat and the temperature of surrounding ob jects will a this transfer, this must be taken into account when selecting a resistor. *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 into account when selecting a resistor. temperature. Ambient air temperature, velocity of cooling air, thermal resistance of heat and the temperature of surrounding objects will a this transfer,this must be taken into account when selecting a resistor. Physical Data Phys ical Data P hysical Data Dimensions (mm) Dimensions(mm) contact point contact point contact point contact point Dimensions (mm) C C Type L max. D max. f min. d nom. C Type L max. D max. f min. d nom. C contact point contact point C Type L D f d C nom LOB-1LOB-1 9.90.9.90.3 3 3.60.3.60.2 2 38.13.38.13.2 0.8130.02 0.8130.05 33.275 33.27 d d D D LOB-1 9.90.3 3.60.2 38.13.2 0.8130.05 33.27 LOB-3LOB-3 14.220.214.220.25 55.330.25.330.25 34.933.15 34.933.18 0.810.08 0.810.05 33.275 33.27 L L f f d D LOB-3 34.933.18 33.27 14.220.2LOB-5 23.370.25 5.330.25 8.380.25 5 31.753.10.810.08 1.020.05 5 42.42 LOB-5 23.370.25 8.380.25 31.753.18 1.020.05 42.42 L f LOB-5 23.370.25 8.380.25 31.753.18 1.020.05 42.42 Description Construction Description Construction DescriptionLOB Series power precision metal element resistors featureConstructionLOB Series resistors feature tinned copper leads welded LOB Series power precision metal element resistors feature LOB Series resistors feature tinned copper leads welded LOB Seriesresistancepowervaluesprecisiondownmetalto 0.005element rwithesistorsvirtuallyfeatunore LOB Seriesdirectlyresistorsto a lowfeatutemperature tinned rcoppere coe leads rweldedesistance element in resistance values down to 0.005 with virtually no directly to a low temperature coefficient resistance element in resistanceinductance.values downAvailableto 0.005in 1,3withand 5virtuallywatt ratedno axial leaded directlyatohighlya lowautomatedtemperaturpercoeoprietary prrocess.esistanceTheelementleaded rinesistor inductance. Available in 1, 3 and 5 watt rated axial leaded a highly automated proprietary process. The leaded resistor inductance.packages,Availabletheseinr1,esistors3 anda5rewattcompatiblerated axialwithleadedautomatic a highlyelementsautomatedarepthenroprietaryencapsulatedprocess.inThea mouldingleaded resistorcompound. packages, these resistors are compatible with automatic elements are then encapsulated in a moulding compound. packages,insertionthese requipment.esistors are compatible with automatic elements are then encapsulated in a moulding compound. insertion equipment. insertion equipment. Applications Applications ApplicationsSwitchmode and linear power supplies. Switchmode and linear power supplies. Switchmode and linear power supplies. Automotive current-sensing circuits. Automotive current-sensing circuits. Automotive current-sensing circuits. Instrumentation. Instrumentation. Instrumentation. GeneralNote Welwyn Components reserves the right to make changes in product without notice or liability. General Note GeneralNoteGeneral Note BI Technologies IRC Welwyn General Note A subsidiary of All information is subject to Welwyns own data and is considered accurate at time of going to print. Welwyn Components reserves the right to make changes in product without notice or liability. Welwyn Components reserves the right to make changes in product specification without notice or liability. TT electronics reserves the right to make changes in product specication without notice or liability. TT electronics plc All information is subject to Welwyns own data and is considered accurate at time of going to print. A subsidiary of All information is suAll informationbject to TT Electronics own dais subject to Welwyntsa and is considered accuown data and is considerate at time of going to print.red accurate at time of going to print. A subsidiary of WelwynComponentsLimited Bedlington, Northumberland NE227AA,UK All information is subject to TT electronics own data and is considered accurate at time of going to print. www.ttelectronicsresistors.com TT electronics plc TT electronics plc www.bitechnologies.com www.irctt.com www.welwyn-tt.com Telephone: +44 (0) 1670822181 Facsimile: +44 (0) 1670829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue B 03.02 WelwynComponentsLimited Bedlington, Northumberland NE227AA,UK Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK TT Electronics plc Telephone: +44 (0) 1670822181 Facsimile: +44 (0) 1670829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue B 03.02 TT electronics plc Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue B 03.02 104 08.16 11. 11 104 104Low Resistance Metal Low Resistance Metal Low Resistance Metal Element Resistors Element Resistors Element Resistors LOB Series Welwyn Components LOB Series LOB Series Power derating percentage vs Temperature coefficient of resistance vs Free air ambient temperature Resistance value 100 400 90 LOB1 80 LOB3 300 70 60 200 50 40 30 LOB5 100 20 10 0 0 0 25 50 75 100 125 150 175 0 25 50 75 100 -3 Resistance (ohms x 10 ) Ambient Temp (C) eT st MIL- TS D AM X% *R nU it Loa d life ( rs) Met %1 %R rma l shock Met %1 %R Vib ion Met % %R M ce hani ac l sho kc Met % %R D ctric ts rengt h Met % %R 11 nI s luatoi n resistance Met 1> 0 ohms *0.0005 ohm allowance for test/contact error. Packaging Resistors are supplied taped and reeled. Bulk packaging available. Ordering Procedu re Example: LOB3 at 10 milliohms and 5% tolerance on a reel of 1250 pieces - L O B 3 R 0 1 J I Type Value (use IEC62 code) Tolerance (use IEC62 code) F 1% J 5% H 3% Note: 1% & 5% preferred Packing LOB1 3500/reel I Tape LOB3 1250/reel Standard LOB5 800/reel General Note General Note BI Technologies IRC Welwyn TT Electronics reserves the right to make changes in product specification without notice or liability. TT electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics own data and is considered accurate at time of going to print. All information is subject to TT electronics own data and is considered accurate at time of going to print. www.ttelectronicsresistors.com www.bitechnologies.com www.irctt.com www.welwyn-tt.com Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK TT Electronics plc Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue B 03.02 TT electronics plc 08.16 11. 11 105 Rated Power (%) Temperature Coefficient of resistance (ppm/C) 203 doh 5.0 103 doh elei 5.0 312 doh 5.0 402 doh tar 701 doh ehT 801 doh uoh 0002 202