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4805 Datasheet(PDF) 2 Page - Welwyn Components Limited |
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4805 Datasheet(HTML) 2 Page - Welwyn Components Limited |
2 / 2 page Construction The resistor element is an etched bulk metal foil, bonded to an alumina substrate. Connections to the foil are made by copper wires welded to the foil to minimise thermal e.m.f. Before encapsulation, the resistor element is coated with silicone rubber to isolate the element from mechanical stress which would adversely affect the carefully balanced construction and result in poor resistance/temperature characteristics. Ultra Precision Bulk Metal Film Resistors 4800 series © 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 187 Dimensions (mm) & Weight (g) Type L max H max W max T min d nom S nom Wt. nom 4802 8.9 10.2 3.8 30 0.6 5.1 1 4812 7.5 8 2.5 30 0.6 5.1 0.6 4804 15.2 13.2 3.8 30 0.6 10.2 1.5 4805 22.6 13.2 3.8 30 0.6 17.8 2 4832 9.7 5.4 9.7 30 0.6 1.5 1.1 Physical Data L 4802/12/04/05 4832 W S H T d dia L H T d W S Issue B · 03.02 Welwyn Components Actual Maximum Typical Load at commercial rating: 1000 hours at 70°C ∆R% 0.05 0.02 Dry heat: 1000 hours at 155°C ∆R% 0.05 0.02 Shelf life: 12 months at room temperature ∆R% 0.0025 Derating from rated power at 70°C Zero at 155°C Short term overload ∆R% 0.01 0.005 Climatic category 55/155/56 Climatic ∆R% 0.05 0.03 Long term damp heat ∆R% 0.05 0.03 Temperature rapid change ∆R% 0.01 0.005 Resistance to solder heat ∆R% 0.01 0.005 Vibration and bump ∆R% 0.01 0.005 Noise. (in a decade of frequency) µV/V Below level of Voltage coefficient of resistance ppm/V practicable measurement Insulation Resistance ohms >1000M Inductance µH 0.2 0.08 Capacitance pF 1 0.5 Terminations Material Solder coated copper wire Strength The terminations meet the requirements of IEC 68.2.21. Solderability The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2. Marking Type reference, resistance value, tolerance and date code are legend marked. The resistance value conforms to IEC 62. Solvent Resistance The protection will withstand all normal industrial solvents suitable for cleaning printed circuit boards. Packaging All components are supplied loose packed in either plastic bags or panel boxes. Quantity per box will depend on resistor size. Performance Data |
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