Low Resistance Metal Low Resistance Metal Resistors Resistance Metal Low Resistance Metal Element Resistors Element Resistors Element Resistors Element Resistors Low Resistance Metal LOB Series LOB Series Resistors Element LOB Series • Ultra low resistance values LOB Series Welwyn Components Welwyn Components Welwyn Components (0.005Ω to 0.1Ω) • low Ultra low resistance values ·LOBUltra resistance values Series • Ultra low resistance Ω )to 0.1 Ω) in 1,values 3 and 5 watt rated packages •toAvailable (0.005(0.005 0.1 (0.005 Ω to 0.1 Ω) Ultra low resistance values Available in 1, 3 and 5 watt rated packages • • inTolerances · Available 1, 3 and 5 watt fromrated ±1%packages to ±5% (0.005Ω to 0.1Ω) Available in 1, 3 and 5 watt rated packages ·• Tolerances from ±1% ±5%to ±5% fromto±1% • Tolerances Inherently non-inductive (≤.02µH at 0.5MHz) Available•infrom 1, 3 and 5 to watt rated packages ±1% ±5% ·• Tolerances Inherently non-inductive ( .02µH at 0.5MHz) non-inductive ( ≤.02µH at 0.5MHz) • Inherently • Low Tolerances from temperature ±1% to ±5% coefficient of resistance ·• Inherently Low temperature coefficient of resistance non-inductive ( ≤.02µH at 0.5MHz) temperature coe resistance • Low stability over life Inherently non-inductive (≤.02μH at of 0.5MHz) • High ·• Low Hightemperature stability overcoe life of resistance High stability over life of resistance Low• temperature coefficient stability over life • High High stability over life Electrical Data Electrical Data Electrical Data Continuous power dissipation at 25°C in free air LOB-1 watts LOB-1 1 5 LOB-1 watts watts 1 Overload power for 5 seconds Continuous power dissipation at 25°C in free air Maximum working voltage Continuous power dissipation at 25°C in free air Overload power for 5 seconds Maximum storage temperature OverloadMaximum power forworking 5 seconds voltage All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2) watts watts watts volts1 volts °C5 LOB-3 LOB-3 3 15 LOB-3 3 √1xR 3 √1xR 175 15 5 LOB-5 LOB-5 5 25 LOB-5 5 15 √3xR √3xR 175 25 √5xR √5xR 175 5 25 Maximum working voltage volts √5xR * Powerstorage Dissipation - The maximum wattage rating depends upon the amount of which can be transferred to√3xR the surroundings the Maximum temperature °Cheat√1xR 175 175 while not exceeding 175maximum 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 175 hile 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 ob jects will a * 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. 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. Maximum storage temperature 175 175 w * Power Dissipation -when The maximum rating depends upon the amount°C of heat which can be transferred to the surroundings into account selecting wattage a resistor. Physical Data Physical DimensionsData (mm) Physical Data Dimensions (mm) contact point Type L max. D max. f min. d nom. Dimensions (mm) 9.9±0.3D max. 3.6±0.2f min.38.1±3.2 0.813±0.05C Type LOB-1 L max. d nom. LOB-3 14.22±0.25 5.33±0.25 34.93±3.18 0.81±0.05 Type C nom LOB-1L 9.9±0.3 D 3.6±0.2 f 38.1±3.2 d0.813±0.05 33.27 LOB-1 LOB-5 23.37±0.25 8.38±0.25 31.75±3.18 0.813±0.05 38.1±3.2 33.27 9.9±0.3 3.6±0.2 LOB-3 14.22±0.25 5.33±0.25 34.93±3.18 0.81±0.051.02±0.05 33.27 LOB-3 34.93±3.18 5.33±0.25 0.81±0.05 14.22±0.25 LOB-5 23.37±0.25 8.38±0.25 31.75±3.18 1.02±0.05 33.27 42.42 LOB-5 23.37±0.25 8.38±0.25 Description 31.75±3.18 1.02±0.05 42.42 C 33.27 contact point dC contact point 33.27 42.42 d d D contact point C D contact point C contact point D L L L f f f Construction LOBΩ Series power precision metal element resistors feature Construction LOBΩ Series resistors feature tinned copper leads welded Description resistance values down to 0.005Ω with virtually no a low temperature coefficient resistance element in LOBΩ Series power precision metal element resistors featureConstruction LOBΩdirectly Series to resistors feature tinned copper leads welded Description inductance. Available in 1, 3 and 5 watt rated axial leaded a highly automated proprietary process. The leaded resistor resistance down to 0.005 Ω resistors with virtually no directly to a low temperature coe leads resistance LOB Series power values precision metal element feature LOB Series resistors feature tinned copper welded element in packages, these resistors are compatible with automatic elements are then encapsulated in a moulding compound. inductance. Available in 1,Ω3 with and 5virtually watt rated proprietary process. Theelement leaded resistor resistance values down to 0.005 no axial leaded directlyatohighly a lowautomated temperature coe resistance in insertion equipment. packages, these compatible with automatic areproprietary then encapsulated a moulding compound. inductance. Available inresistors 1, 3 and are 5 watt rated axial leaded a highlyelements automated process. in The leaded resistor insertion equipment. packages, these resistors are compatible with automatic elements are then encapsulated in a moulding compound. Applications insertion equipment. • Switchmode and linear power supplies. Applications current-sensing circuits. and linear power supplies. Applications • Automotive • Switchmode • • • Switchmode and linear power supplies. current-sensing circuits. • Instrumentation. • Automotive 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 TT electronics plc A subsidiary of TT Electronics reserves the right+44 to changes inchanges product specification without notice or liability. Welwyn Components reserves themake right to make in product without notice or liability. Issue plc B · 03.02 Telephone: 1670 822181 · Facsimile: +44 (0) 1670 829465 Email: [email protected] · Website: www.welwyn-tt.com TT electronics TT electronics reserves the right to (0) make changes in product specification without notice· or liability. A subsidiary of All information is subject to Welwyn’ s own data and is considered accurate at time of going to print. All information is subject Components to TT Electronics’Limited own data and is· Bedlington, considered accurate at time ofNE22 going7AA, to print. © Welwyn All information is subject to TT electronics’ own data and is consideredNorthumberland accurate at time of going toUK print. www.ttelectronicsresistors.com TT electronics plc www.bitechnologies.com www.irctt.com www.welwyn-tt.com 104 Issue B · 03.02 Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com © Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK © TT Electronics plc Issue B · 03.02 Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com © TT electronics plc 104 05.16 11. 11 All Note information is subject to Welwyn’s own data and is considered accurate at time of going to print. General Welwyn without notice or liability. General Note Components reserves the right to make changes in product General Note © Welwyn Components Northumberland NE22 7AA, UK General Note All information is subject to Welwyn’s ownLimited data and ·isBedlington, considered accurate at time of going to print. 104 BI Technologies IRC Welwyn 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.ttelectronicsresistors.com www.bitechnologies.com www.irctt.com www.welwyn-tt.com © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK © TT TT Electronics plcplc822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com Telephone: +44 (0) 1670 © electronics Issue B · 03.02 05.16 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.ttelectronicsresistors.com © TT Electronics plc 05.16