RC55

Precision Metal Film Resistors RC series Welwyn Components • CECC released products with low TCRs over a wide resistance range • Resistance tolerance down to 0.05% • Express delivery available • Low noise and negligible voltage coefficient Electrical Data RC55 Commercial Power rating at 70°C Resistance range Limiting element voltage Isolation voltage TCR (20 to +70°C) & codes Resistance tolerance Approved CECC 40101-004 Power rating at 70°C Resistance range Limiting element voltage Isolation voltage TCR & codes Resistance tolerance (code) Approved CECC 40101-804 Power rating at 70°C Resistance range Limiting element voltage Isolation voltage TCR & codes Resistance tolerance (code) Standard values Thermal impedance Ambient temperature range °C/watt °C 110 watts ohms volts volts ppm/°C % watts volts volts ppm/°C % A 0.125 1R to 1M 200 280 B 0.25 1R to 1M 250 350 watts ohms volts volts ppm/°C % H 0.063 200 280 J 0.125 200 280 0.25 1R to 4M 350 500 0.5 1R to 4M 350 500 5(V), 10(T), 15(Y), 25(D), 50(C) & 100(Z) 0.05(W), 0.1(B), 0.25(C), 0.5(D) & 1(F) K 0.25 250 350 K 0.25 10R to 1M 250 350 15(Y), 25(D), 50(C) & 100(Z) 0.05(W), 0.1(B), 0.25(C), 0.5(D) & 1(F) B 0.25 10R to 1M 250 350 15(T), 25(E) & 50(C) 0.05(W), 0.1(B), 0.25(C), 0.5(D) & 1(F) E24, E96 preferred 70 -55 to +155 60 C 0.5 10R to 1M 350 500 See resistance restrictions Any value to order L 0.5 10R to 1M 350 500 See resistance restrictions 1.0 1R to 10M 500 700 See resistance restrictions RC65 RC70 Notes ohms 1R to 1M 1R to 1M 1R to 1M 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 © 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 173 Precision Metal Film Resistors RC series Welwyn Components Physical Data Dimensions (mm) & Weight (g) PCB mounting Type RC55 RC65 RC70 L max 7.2 10.0 15.5 D max 2.5 3.7 5.5 f min 30 30 30 d nom 0.6 0.6 0.8 centres 10.2 12.7 18.4 Min. Bend Radius 0.6 0.6 1.2 Wt. nom 0.24 0.40 1.15 d D L f Construction A metal film is deposited onto a high quality ceramic former. Nickel-plated steel caps are force fitted to the former and termination wires are welded to the caps. The resistor is adjusted to value by a helical cut in the film and the body is protected with a specially formulated epoxy coating. Marking Type reference, TCR code, resistance value and tolerance code. The resistance values conform to IEC 62. Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. 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. Performance Data CECC 40101-004 CECC 40101-804 Requirements Load at commercial rating: 1000 hours at 70°C Load at CECC rating: 1000 hours at 70°C Dry heat: 1000 hours at 155°C Shelf life: 12 months at room temperature Derating from rated power at 70°C Short term overload Climatic Climatic category Long term damp heat Temperature rapid change Resistance to solder heat Vibration and bump Noise (in a decade of frequency) Voltage coefficient of resistance ∆R% ∆R% ∆R% ∆R% µV/V ppm/V ∆R% ∆R% ∆R% ∆R% ∆R% ∆R% 0.5 0.5 Not specified Zero at 155°C 0.1 0.5 55/155/56 0.5 0.1 0.1 0.1 Not specified Not specified 0.5 0.5 Not specified 50% at 125°C 0.1 0.5 55/125/56 0.5 0.1 0.1 0.1 Not specified Not specified 0.1 0.3 55/155/56 0.5 **0.2 0.06 0.06 1.0 0.1 0.05 0.03 0.02 0.1