Low Resistance Metal Low Resistance Metal Resistors Welwyn Components Element Resistors Low Resistance Metal Low Resistance Metal Welwyn Components Element Resistors Welwyn Components Element Resistors Low Resistance Metal Element Resistors LOB Series Element Resistors LOB Series LOB Series Ultra low resistance values LOB Series (0.005 to 0.1) Ultra low resistance values LOB Series Ultra low resistance values Ultra low resistance values Available in 1, 3 and 5 watt rated packages (0.005 to 0.1) (0.005 to 0.1 ) Ultra low resistance values to 0.005 (0.005 to 0.1) Available in 1, 3 and 5 watt rated packages Tolerances from 1% to 5% Available in 1, 3 and 5 watt rated packages Availa ble in 1, 3 and 5 watt rated packages 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) Tolerances from 1% to 5% Tolerances from 1% to 5% Inherently non-inductive ( .02H at 0.5MHz) Inherently non-inductive ( .02H at 0.5MHz) Low temperature coefficient of resistance Inherently non-inductive (.02H at 0.5MHz) InheLow temperaturently non-inductivere coefcient of ( .02Hresistance at 0.5MHz) Low temperature coe of resistance Low temperature coefficient of resistance High stability over life High stability over life Low temperature coe of resistance High stability over life High stability over life High stability over life AllAll Pb-Pb-frfreeee partsparts ccomplyomply withwith EUEU DirDirectivectivee 2011/65/EU2011/65/EU amended amended b yb y(EU) (EU) 2015/863 2015/863 (R (RoHS3)oHS3) Electrical Data Electrical Data Electrical Data LOB-1 LOB-3 LOB-5 Electrical Data LOB-1 LOB-3 LOB-5 Continuous power dissipation at 25C in free air watts 13 5 LOB-1 LOB-3 LOB-5 Continuous power dissipation at 25C in free air watts 1 3 5 Overload power for 5 seconds watts 5 15 25 Continuous power dissipation at 25C in 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 Resistance range ohms R005 to R100 R005 to R120 R005 to R100 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 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 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 C Operating temperature temperatu re. Ambient air temperatu re, velocity of cooling air, thermal resistance of heat and -55 to 175 the temperature of surrounding -55 to 175 ob jects will a this -55 to 175 transfer, this must be taken into account when selecting a resistor. 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 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 Physical Data Dimensions (mm) Dimensions (mm) contact point contact point contact point contact point C Dimensions (mm) 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 LOB-1 9.90.3 3.60.2 38.13.2 0.8130.05 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 d d D D LOB-3 14.220.25 5.330.25 34.933.18 0.810.05 33.27 LOB-1 38.13.2 0.8130.05 33.27 LOB-39.90.14.220.23 3.60.5 5.330.22 5 34.933.18 0.810.05 33.27 L f L f d D LOB-3 LOB-5 23.370.25 8.380.25 31.753.18 1.020.05 42.42 14.220.25 5.330.25 34.933.18 0.810.05 33.27 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 DescriptionDescription ConstructionConstruction 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 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 resistance values down to 0.005 with virtually no directly to a low temperature coefficient resistance element in 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 inductance. Available in 1, 3 and 5 watt rated axial leaded a highly automated proprietary process. The leaded resistor 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, these resistors are compatible with automatic elements are then encapsulated in a moulding compound. packages,insertion these requipment.esistors are compatible with automatic elements are then encapsulated in a moulding compound. insertion equipment. insertion equipment. Applications Applications Switchmode and linear power supplies. Applications 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. General Note General NotWelwyne Components reserves the right to make changes in product without notice or liability. General Note General Note BI Technologies IRC Welwyn General Note All information is subject to Welwyns own data and is considered accurate at time of going to print. A subsidiary of 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 specification without notice or liability. Welwyn Components reserves the right to make changes in product 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 subAll informationject to TT Electronics own dat is subject to Welwyna and is considered accurs own data and is consideate at time of going to print.red accurate at time of going to print. A subsidiary of All information is subject to Welwyns own data and is considered accurate at time of going to print. A subsidiary of Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK www.ttelectronics.com/resistors All information is subject to TT electronics own data and is considered accurate at time of going to print. TT electronics plc TT electronics plc www.bitechnologies.com www.irctt.com www.welwyn-tt.com Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue B 03.02 Welwyn ComponentsWelwyn Components Limited LimitedBedlington, Northumberland Bedlington, Northumberland NE22 7AA, UK NE22 7AA, UK TT Electronics plc Telephone:T +44elephone: (0) 1670 +44 822181 (0) 1670 Facsimile: 822181 +44 Facsimile:(0) 1670 829465 +44 (0 Email:) 1670 info welwyn-tt.com 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Website: www.welwyn-tt.com Issue B 03.02 Issue B 03.02 TT electronics plc 06.18 104 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.ttelectronics.com/resistors 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 06.18 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