4800 WELWYN | Alldatasheet
Document overview
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Technical content
4800 Series
- 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 Commercial 4802/12/32 4804 4805 Notes Power Rating at 20°C watts 0.5 1 1.5 Resistance Range ohms 1R0 to 100K 0R5 to 200K 33R0 to 300K Limiting element voltage volts 200 350 500 TCR (20 to 70°C) ppm/°C 5 5 5 Resistance tolerance See table 1 below Approved BS CECC 40-302-002* 4802/12 Power rating at 70°C watts 0.25 Resistance range ohms 100 to 56K Limiting element voltage volts 200 TCR (-55 to 125°C) ppm/°C 5 Resistance tolerance See table 1 below Thermal impedance °C/watt 250 130 80 Values E24 and E96 preferred Any value to order Ambient temperature range °C -55 to 155 All styles and products 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. © 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 * BS CECC 40 Style reference: 4802 BX; 4812 CX Electrical Data
Table 1. Resistance Range (ohms) and Tolerance (%)
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 Physical Data L 4802/12/04/05 4832 W S H T d dia LH 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