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| Low Resistance Metal Element Resistors LOB Series Welwyn Components * Ultra low resistance values (0.005 to 0.1) * Available in 1, 3 and 5 watt rated packages * Tolerances from 1% to 5% * Inherently non-inductive (.02H at 0.5MHz) * Low temperature coefficient of resistance * High stability over life Electrical Data LOB-1 Continuous power dissipation at 25C in free air Overload power for 5 seconds Maximum working voltage Maximum storage temperature watts watts volts C 1 5 1xR 175 LOB-3 3 15 3xR 175 LOB-5 5 25 5xR 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 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 into account when selecting a resistor. Physical Data Dimensions (mm) contact point Type LOB-1 L max. 9.90.3 D max. 3.60.2 f min. 38.13.2 d nom. 0.8130.05 C 33.27 33.27 42.42 d D C contact point LOB-3 14.220.25 5.330.25 34.933.18 0.810.05 LOB-5 23.370.25 8.380.25 31.753.18 1.020.05 L f Description LOB Series power precision metal element resistors feature resistance values down to 0.005 with virtually no inductance. Available in 1, 3 and 5 watt rated axial leaded packages, these resistors are compatible with automatic insertion equipment. Construction LOB Series resistors feature tinned copper leads welded directly to a low temperature coefficient resistance element in a highly automated proprietary process. The leaded resistor elements are then encapsulated in a moulding compound. Applications * * * Switchmode and linear power supplies. Automotive current-sensing circuits. Instrumentation. General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyn's own data and is considered accurate at time of going to print. A subsidiary of TT electronics plc Issue B * 03.02 (c) Welwyn Components Limited * Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com 104 Low Resistance Metal Element Resistors LOB Series Power derating percentage vs Free air ambient temperature 100 90 Welwyn Components Temperature coefficient of resistance vs Resistance value Temperature Coefficient of resistance (ppm/C) 400 Rated Power (%) 80 70 60 50 40 30 20 10 0 0 25 50 75 100 125 150 175 300 200 100 0 0 25 50 75 100 Ambient Temp (C) Resistance (ohms x 10-3) Test Load life (2000 hours) Thermal shock Vibration Mechanical shock Dielectric strength Insulation resistance *0.0005 ohm allowance for test/contact error. MIL-STD 202 Method 108 Method 107 Method 204 Method 213 Method 301 Method 302 MAX %R* 1% 1% 0.5% 0.5% 0.5% >1011 Unit %R %R %R %R %R ohms Packaging Resistors are supplied taped and reeled. Bulk packaging available. (c) Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com Issue B * 03.02 105 |
Price & Availability of LOB
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