RC70P

Precision Metal Film Resistors RCP series Welwyn Components • Precision resistors with uprated power • Low TCRs over a wide resistance range • Tolerance down to 0.05% • Low noise and negligible voltage coefficient • Express delivery available Electrical Data RC55P Power rating at 70°C Resistance range Limiting element voltage Isolation voltage TCR (20 to +70°C) & codes Resistance tolerance (code) Standard values Thermal impedance Ambient temperature range °C/watt °C 110 watts ohms volts volts ppm/°C % 0.5 1R to 4M 350 500 RC65P 1.0 1R to 4M 500 500 RC70P 1.5 1R to 10M 500 700 See resistance restrictions Any value to order 60 Notes 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) E24, E96 preferred 70 -55 to +155 Physical Data Dimensions (mm) and Weight (g) PCB mounting d nom. centres 0.6 0.6 0.8 10.2 12.7 18.4 Min Bend Radius 0.6 0.6 1.2 Wt. nom. 0.24 0.40 1.15 Type RC55P RC65P RC70P L Max 7.2 10.0 15.5 D Max 2.5 3.7 5.5 f min 30 30 30 d D L f Construction Ceramic rods are coated with a metal film and plated steel caps are force fitted. A helical cut is used to adjust the film to its final value. Termination wires are welded to the caps and the resistor is protected with a specially formulated epoxy coating. Marking Type reference, TCR code, resistance value and tolerance code. The resistance value marking conforms to IEC 62. Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning fluids 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 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 176 Precision Metal Film Resistors RCP series Welwyn Components Application Notes Matched Sets and Networks Welwyn has many years experience in the supply of matched sets of precision resistors. Resistors can be supplied matched for tolerance and TCR down to ±0.02% and ±2ppm/°C, either as separate resistors or pre-assembled and encapsulated within a plastic box. The individual resistors within a set or module can be manufactured with a tolerance of ±0.05% and a TCR of ±5ppm/°C. Performance Data RC55P Values 10 ≤ 100k Actual Performance Maximum Load at rated power : 1000 hrs at 70°C Dry heat : 1000 hrs 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 0.25 0.04 0.02 0.2 0.1 ∆R % ∆R % 0.5 0.25 55/155/56 0.05 0.02 0.003 0.002 0.03