Low Resistance Metal Low Resistance Metal Resistors Low Resistance Metal Low Resistance Metal Welwyn Components Element Resistors Welwyn Components Element Resistors Welwyn Components Element Resistors Element Resistors Low Resistance Metal LOB Series LOB Series Element Resistors LOB Series Ultra low resistance values LOB Series (0.005 to 0.1) Ultra low resistance values Ultra low resistance values LOB Series Ultra low resistance values (0.005 to 0.1 ) Available in 1, 3 and 5 watt rated packages (0.005 to 0.1 ) (0.005Ultra low resistot ance v0.1 alues) Available in 1, 3 and 5 watt rated packages Available in 1, 3 and 5 watt rated packagesTolerances from 1% to 5% (0.005 to 0.1) Available in 1, 3 and 5 watt rated packages Tolerances fTolerancesrom 1% to 5% from 1% to 5% Inherently non-inductive (.02H at 0.5MHz) Availa ble in 1, 3 and 5 watt rated packages Tolerances from 1% to 5% Inherently non-inductive ( .02H at 0.5MHz) Inherently non-inductive ( .02H at 0.5MHz) Low temperature coefficient of resistance Tolerances from 1% to 5% InheLow temperaturently non-inductivere coefcient of ( .02Hresistance at 0.5MHz) Low temperature coe of resistance High stability over life Inherently non-inductive (.02H at 0.5MHz) High stability over life Low temperature coe of resistance High stability over life Low temperature coefficient of resistance High stability over life High stability over life All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2) Electrical Data Electrical Data LOB-1 LOB-3 LOB-5 Electrical Data Continuous power dissipation at 25C in free air watts 1 3 5 LOB-1 LOB-3 LOB-5 Overload power for 5 seconds watts 5 15 25 LOB-1 LOB-3 LOB-5 Continuous power dissipation at 25C in free air watts 1 3 5 Maximum working voltage volts 1xR 3xR 5xR Continuous power dissipation at 25C in free air watts 1 3 5 Overload power for 5 seconds watts 5 15 25 Maximum storage temperature C 175 175 175 Overload power for 5 seconds watts 5 15 25 Maximum working voltage volts 1xR 3xR 5xR Maximum working voltage volts 1xR 3xR 5xR * 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 Maximum storage temperature C 175 175 175 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 Maximum storage temperature C 175 175 175 * Powerinto account when selecting a r Dissipation - The maximum wattageesistor 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 ob jects will a this transfer, this must be taken * 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 transfe r, this must be taken into account when selecting a resistor. Physical Data Physical Data Dimensions (mm) contact point contact point Physical Data C Dimensions (mm) Type L max. D max. f min. d nom. C contact point contact point Dimensions (mm) C LOB-1 9.90.3 3.60.2 38.13.2 0.8130.05 33.27 Type L max. D max. f min. d nom. C contact point contact point d C D LOB-3 14.220.25 5.330.25 34.933.18 0.810.05 33.27 Type L D f d C nom LOB-1 9.90.3 3.60.2 38.13.2 0.8130.05 33.27 L f d LOB-5 23.370.25 8.380.25 31.753.18 1.020.05 42.42 D LOB-1 9.90.3 3.60.2 38.13.2 0.8130.05 33.27 LOB-3 14.220.25 5.330.25 34.933.18 0.810.05 33.27 L 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 L f LOB-5 23.370.25 8.380.25 31.753.18 1.020.05 42.42 Description Construction LOB Series power precision metal element resistors feature LOB Series resistors feature tinned copper leads welded Description Construction resistance values down to 0.005 with virtually no directly to a low temperature coefficient resistance element in DescriptionLOB Series power precision metal element resistors featureConstructionLOB Series resistors feature tinned copper leads welded inductance. Available in 1, 3 and 5 watt rated axial leaded a highly automated proprietary process. The leaded resistor LOB Seriesresistance power valuesprecision down metal to 0.005element rwithesistors virtually featu nore LOB Seriesdirectly resistors to a lowfeatu temperature tinned rcoppere coe leads rweldedesistance element in packages, these resistors are compatible with automatic elements are then encapsulated in a moulding compound. resistanceinductance. values down Available to 0.005 in 1, 3 withand 5virtually watt rated no axial leaded directly ato highly a low automated temperatu rper coeoprietary p rrocess.esistance The element leaded rinesistor insertion equipment. inductance.packages, Available these in r1,esistors 3 and a5r ewatt compatible rated axial with leaded automatic a highlyelements automated are p thenroprietary encapsulated process. inThe a mouldingleaded resistor compound. packages,insertion these requipment.esistors are compatible with automatic elements are then encapsulated in a moulding compound. Applications insertion equipment. Switchmode and linear power supplies. Applications ApplicationsSwitchmodeAutomotive curr and linearent-sensing cir power supplies.cuits. Switchmode and linear power supplies. Instrumentation. Automotive current-sensing circuits. Automotive current-sensing circuits. Instrumentation. Instrumentation. General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. A subsidiary of All information is subject to Welwyns own data and is considered accurate at time of going to print. General Note TT electronics plc Welwyn Components reserves the right to make changes in product without notice or liability. General Note General Note BI Technologies IRC Welwyn General Note Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK A subsidiary of All information is subject to Welwyns own data and is considered accurate at time of going to print. TT Electronics reserves the right to make changes in product specification without notice or liability. Welwyn Components reserves the right to make changes in product without notice or liability. Issue B 03.02 Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com 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 subject to TT Electronics own data and is considered accurate at time of going to print. Welwyn Components Limited Bedlington, Northumberland NE22 7AA, 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 www.bitechnologies.com www.irctt.com www.welwyn-tt.com 104Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue B 03.02 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 104 05.16 11. 11 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 05.16 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