Low Resistance Metal Low Resistance Metal Resistors Element Resistors Low Resistance Metal Resistance Metal Element Resistors Element Resistors Low Resistance Metal Element Resistors LOB Series Element Resistors LOB Serieslow LOB Series * Ultra resistance values Welwyn Components Welwyn Components Welwyn Components LOB Series (0.005 tovalues 0.1) values * Ultra lowresistance Series *LOBUltra lowresistance * Ultra low Available in 1, 3 values and 0.1 ) 5 watt rated packages * (0.005 (0.005 to resistance 0.1 )to Ultra low resistance values to 0.005 (0.005 to 0.1 ) 3 and 5 watt packages Tolerances from 1% torated 5% * Available * Available in 1,in 3 1, and 5 watt rated packages Available in 1, 33 and 55watt rated packages Available in 1, and watt rated packages * * Tolerances rom f 1% to 5% from 1% to 5% (.02H at 0.5MHz) * Tolerances Inherently Tolerances from 1%non-inductive to 5% Tolerances from 1% to 5% ** Inhe non-inductive ( .02H at 0.5MHz) Inhe non-inductive ( at 0.5MHz) .02H 0.5MHz) **rently Lowrently temperature coefficient ofat resistance Inherently non-inductive (.02H ** Inhe Lowrently temperatu re coefficient of resistance non-inductive ( .02H at 0.5MHz) Low reover coe of of resistance Low* coefficient resistance Hightemperatu stability life *temperature ** Low High stability rover life temperatu e coe of resistance High*stability over life Highstability overlife High stability over life * All Pb-free parts comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3) Electrical Data Electrical Data Electrical Electrical Data Data LOB-1 LOB-3 LOB-5 LOB-1 1 LOB-3 3 LOB-5 5 Continuous power dissipation at 25C in free air watts LOB-3 LOB-5 Continuous power dissipation at 25Cin free air watts LOB-1 1 3 5 Overload power for 5 seconds watts 5 15 25 Continuous powerpower dissipation at 25C in free air watts watts 1 3 5 Overload for 5 seconds 5 15 25 Maximum working voltage volts 1xR 3xR 5xR OverloadMaximum power forworking 5 seconds watts 5 15 25 voltage volts 1xR 3xR 5xR Operating temperature C -55 to 175 -55 to 175 -55 to 175 R005 to R100175 R005 to R120175 R005 to R100175 Resistance range storage temperature ohms Maximum C * Power Dissipation - The maximum wattage rating depends upon the volts amount of heat which surroundings while not exceeding the maximum element Maximum working voltage 1xRcan be transferred to the 3xR 5xR *temperature. Power Dissipation - Theair maximum wattage rating of depends the amount of heat which be the transferred to the of surroundings w objects hile not maximum Ambient temperature, velocity coolingupon air, thermal resistance of heatcan and temperature surrounding will exceeding affect thisthe transfer, this element must be taken Cof heat and-55 Operating temperature 175 -55 ob to 175 to 175 this-55 transfer, this must be taken temperature. Ambient air temperature, velocity of cooling air, thermal resistance the to temperature of surrounding jects will a 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 this transfer, this must be taken temperature. Ambient air temperature, velocity of cooling air, thermal resistance of heat and the temperature of surrounding objects will a into account when selecting a resistor. Physical Data Data Physical Physical Data Dimensions (mm) Dimensions(mm) Dimensions (mm) Type max. Type LLmax. LOB-1 9.90.3 Type L LOB-1 9.90. 3D max. f min. d nom. d nom. DDmax. f min. C C 3.60.2 38.13.2 0.8130.05 3.60. 2 f 38.13. 2 d0.8130.0 5C nom 33.27 33.27 LOB-3 14.220.25 5.330.25 34.933.18 0.810.05 LOB-1 LOB-3 38.13. 2 0.8130.05 9.90.3 3.60. 2 14.220.2 5 5.330.2 5 34.933.1 8 0.810.05 33.27 33.27 33.27 LOB-3 14.220.25 LOB-5 23.370.2 23.370.25 8.380.25 31.753.18 1.020.05 34.933.18 5.330.25 0.810.05 LOB-5 5 8.380.2 5 31.753.1 8 1.020.0 5 33.27 42.42 42.42 LOB-5 23.370.25 8.380.25 31.753.18 1.020.05 contact point contact point contact point contact point C d d D d D D L contact point contact point C C L L f f f 42.42 Description Construction Description Construction LOB metal element resistors feature LOB Series resistors feature tinned copper leads welded Description Construction LOB Series Seriespower powerprecision precision metal element resistors feature LOB Series resistors feature tinned copper leads welded resistance toto 0.005 resistors with virtually nono directly to ato low coe leads resistance element in LOB Series power values precision metal element feature LOB Series resistors feature copper welded resistance valuesdown down 0.005 with virtually directly a temperature lowtinned temperature coefficient resistance element in inductance. Available in 1, 3 and 5 watt rated axial leaded a highly automated proprietary process. The leaded resistor resistance values down to 0.005 with virtually no directly to a low temperature coe resistance element in inductance. Available in 1, 3 and 5 watt rated axial leaded a highly automated proprietary process. The leaded resistor packages, these compatible with automatic areproprietary then encapsulated a moulding compound. inductance. Available in resistors 1,resistors 3 and are 5 watt rated axial leaded automated process.in The leaded resistor packages, these are compatible with automatic a highlyelements elements are then encapsulated in a moulding compound. insertion equipment. packages, these resistors are compatible with automatic elements are then encapsulated in a moulding compound. insertion equipment. insertion equipment. Applications Applications supplies. Applications * Switchmode Switchmodeand andlinear linearpower power supplies. * * * * * * Switchmode and linear power supplies. current-sensing circuits. * Automotive Automotive current-sensing circuits. Automotive current-sensing circuits. * Instrumentation. Instrumentation. Instrumentation. GeneralNote General Welwyn Note Components without notice or liability. General Note reserves the right to make changes in product BI General Note General Note All information is subject to Welwyn' own data and ischanges considered accurate atliability. time of going to print. TT Electronics reserves the right to make changes product specification without notice specification or Welwyn Components reserves thesin right to make in product without notice or liability. Technologies IRC Welwyn A subsidiary of Welwyn Components reserves the right to make changes in product without notice or liability. TT electronics plc TT electronics the right to make changes inown product specification without notice or at liabilit y. of going to print. All isissubject Electronics' own data is considered time going toprint. print. All reserves information isWelwyn' subject to Welwyn's data andaccurate isaccurate considered accurate time A subsidiary of A subsidiary of Allinformation information subjecttotoTT s own data andand is considered atattime ofofgoing to (c) Welwyn Components Limited * Bedlington, 7AA,to UKprint. www.ttelectronics.com/resistors TT electronics plc All information is subject to TT electronics' own data and is consideredNorthumberland accurate at timeNE22 of going TT electronics plc www.bitechnologies.com www.irctt.com www.welwyn-tt.com Issue B * 03.02 Telephone: +44 (0) 1670 822181* Facsimile: +44 (0) 1670 829465* Email: info@welwyn-tt.com* Website: www.welwyn-tt.com (c) Components Welwyn Bedlington, Northumberland (c) Welwyn Limited * Limited Bedlington,*Northumberland NE22 7AA,UK NE22 7AA, UK (c) TT Electronics plc Components Issue B * 03.02 Issue B * 03.02 Telephone: +44 (0) 1670 822181 * Facsimile: +44 (0) 1670info@welwyn-tt.com 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com Telephone: +44 (0) 1670 822181 * Facsimile: +44 (0) 1670 829465 * Email: * Website: www.welwyn-tt.com (c) TT elect ronics plc 06.18 104 11. 11 Low Metal LowResistance Resistance Low Resistance MetalMetal Element Resistors Element Resistors Element Resistors LOB Series LOB LOB Series Series Welwyn Components Power derating percentage vs Free air ambient temperature Temperature coefficient of resistance vs Resistance value Temperature Coefficient of resistance (ppm/C) 100 Rated Power (%) 90 80 70 60 50 40 30 20 10 0 0 25 50 75 100 125 150 400 LOB1 LOB3 300 200 LOB5 100 0 175 0 25 50 Resistance (ohms x Ambient Temp (C) 75 100 10-3) Test MIL-STD 202 MAX % R* Unit Load life (2000 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% %R Insulation resistance Method 302 >1011 ohms *0.0005 ohm allowance for test/contact error. Packaging Resistors are supplied taped and reeled. Bulk packaging available. Ordering Procedure Example: LOB3 at 10 milliohms and 5% tolerance on a reel of 1250 pieces LOB3- R01JI Type Value (use IEC62 code) Tolerance (use IEC62 code) F H 1% 3% J 5% Note: 1% & 5% preferred Packing I Tape General Note General Note LOB1 LOB3 LOB5 3500/reel 1250/reel 800/reel Standard TT electronics Electronics reserves make changes in product specification without noticenotice or liability. TT reservesthe theright righttoto make changes in product specification without or liability. All information TTTT Electronics' own data andand is considered accurate at time of going to print. All informationisissubject subjecttoto electronics' own data is considered accurate at time of going to print. BI Technologies IRC Welwyn www.ttelectronics.com/resistors www.bitechnologies.com www.irctt.com www.welwyn-tt.com (c) Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK (c) TT TT Electronics plcplc822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com Telephone: +44 (0) 1670 (c) electronics Issue B * 03.02 06.18 11. 11 105 Low Resistance Metal Element Resistors LOB Series Ordering Procedure This product has two valid part numbers: European (Welwyn) Part Number: LOB3-R01JI (LOB3, 10 milliohms 5%, Pb-free) L O B 3 - R 1 0 1 2 1 2 Type Value J I 3 4 3 LOB1 R = ohms LOB3 LOB5 4 Tolerance Packing & Termination Finish F* = 1% I = Standard packing & Pb-free H = 3% PB = Standard packing & SnPb J* = 5% LOB1 Taped, 3500/reel * preferred LOB3 Taped, 1250/reel LOB5 Taped, 800/reel USA (IRC) Part Number: LOB-3R010FLFSLT (LOB3, 10 milliohms 5%, Pb-free) L O B - 3 R 0 1 1 2 1 2 Type Value LOB-1 R = ohms LOB-3 LOB-5 3 0 F 3 L F S 4 4 Omit for SnPb LF = Pb-free T 5 5 Tolerance Termination Finish F = 1% H = 3% J = 5% L Packing SLT = Lead Tape* LOB-1 3500/reel LOB-3 1250/reel LOB-5 800/reel BLK = Bulk LOB-1 1500/box LOB-3 800/box LOB-5 200/box preferred * General Note 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. BI Technologies IRC Welwyn www.ttelectronics.com/resistors (c) TT Electronics plc 06.18