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| Ultra Precision Bulk Metal Film Resistors 4800 Series Welwyn Components * BS/CECC approved * Tolerances down to 0.005% * Current noise and distortion below level * * * * of practible measurement Low thermal e.m.f Ideal resistor for precision instrumentation Use of bulk metal gives superior stability Planar construction gives low residual capacitance and inductance Electrical Data Commercial Power Rating at 20C Resistance Range Limiting element voltage TCR (20 to 70C) Resistance tolerance watts ohms volts ppm/C 4802/12/32 0.5 1R0 to 100K 200 5 4804 1 350 5 4805 1.5 500 5 See table 1 below Notes 0R5 to 200K 33R0 to 300K Approved BS CECC 40-302-002* Power rating at 70C Resistance range Limiting element voltage TCR (-55 to 125C) watts ohms volts ppm/C 4802/12 0.25 100 to 56K 200 5 Resistance tolerance Thermal impedance Values Ambient temperature range C C/watt 250 130 E24 and E96 preferred -55 to 155 80 See table 1 below Any value to order All styles and products * BS CECC 40 Style reference: 4802 BX; 4812 CX Table 1. Resistance Range (ohms) and Tolerance (%) Tolerance (code) 0.005 (E) 0.01 (L) 0.02 (P) 0.05 (W) 0.1 (B) 0.25 (C) 0.5 (D) 1.0 (F) 4802/12/32 200R to 100K 100R to 100K 50R to 100K 25R to 100K 10R to 100K 5R to 100K 2R to 100K 1R to 100K 4804 100R to 200K 50R to 200K 25R to 200K 10R to 200K 5R to 200K 2R to 200K 10R to 200K 0.5R to 200K 4805 65R to 300K 33R to 300K 17R to 300K 8R to 300K 3.3R to 300K 1.7R to 300K 0.6R to 300K 0.33R to 300K 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 186 Ultra Precision Bulk Metal Film Resistors 4800 series Welwyn Components Physical Data Dimensions (mm) & Weight (g) Type 4802 4812 4804 4805 4832 L max 8.9 7.5 15.2 22.6 9.7 H max 10.2 8 13.2 13.2 5.4 W max 3.8 2.5 3.8 3.8 9.7 T min 30 30 30 30 30 d nom 0.6 0.6 0.6 0.6 0.6 S nom 5.1 5.1 10.2 17.8 1.5 Wt. nom 1 0.6 T H 4802/12/04/05 L W d dia S 4832 1.5 2 1.1 d H L T W S 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. Terminations Material Strength Solderability Solder coated copper wire The terminations meet the requirements of IEC 68.2.21. 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. Performance Data Actual Load at commercial rating: 1000 hours at 70C Dry heat: 1000 hours at 155C Shelf life: 12 months at room temperature Derating from rated power at 70C Short term overload Climatic category Climatic Long term damp heat Temperature rapid change Resistance to solder heat Vibration and bump Noise. (in a decade of frequency) Voltage coefficient of resistance Insulation Resistance Inductance Capacitance R% R% R% R% R% R% R% R% R% V/V ppm/V ohms H pF Maximum 0.05 0.05 Zero at 155C 0.01 55/155/56 0.05 0.05 0.01 0.01 0.01 Below level of practicable measurement >1000M 0.2 1 0.08 0.5 0.03 0.03 0.005 0.005 0.005 0.005 Typical 0.02 0.02 0.0025 Packaging All components are supplied loose packed in either plastic bags or panel boxes. Quantity per box will depend on resistor size. (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 * 03.02 187 |
Price & Availability of 4812
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