Precision Metal Film Resistors Welwyn Components RCP series • 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 RC65P RC70P Power rating at 70°C watts 0.5 1.0 1.5 Resistance range ohms 1R to 4M 1R to 4M 1R to 10M Limiting element voltage volts 350 500 500 Isolation voltage volts 500 500 700 TCR (20 to +70°C) & codes ppm/°C Resistance tolerance (code) % 5(V), 10(T), 15(Y), 25(D), 50(C), & 100(Z) °C/watt Ambient temperature range See resistance 0.05(W), 0.1(B), 0.25(C), 0.5(D), & 1(F) restrictions E24, E96 preferred Any value to order Standard values Thermal impedance Notes 110 °C 70 60 -55 to +155 Physical Data Dimensions (mm) and Weight (g) Type PCB mounting d nom. centres Min Bend Radius Wt. nom. L Max D Max f min RC55P 7.2 2.5 30 0.6 10.2 0.6 0.24 RC65P 10.0 3.7 30 0.6 12.7 0.6 0.40 RC70P 15.5 5.5 30 0.8 18.4 1.2 1.15 d D L f Construction Marking 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. 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 © Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com 176 Issue B · 03.02 Precision Metal Film Resistors Welwyn Components RCP series Application Notes Matched Sets and Networks The individual resistors within a set or module can be manufactured with a tolerance of ±0.05% and a TCR of ±5ppm/°C. 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. Performance Data RC55P Values 10 ≤ 100k Other Values/Styles Actual Performance *Actual Performance Maximum Typical Maximum Typical Load at rated power : 1000 hrs at 70°C ∆R % 0.10 0.03 0.5 0.1 Dry heat : 1000 hrs at 155°C ∆R % 0.3 0.1 1.0 0.15 Shelf life : 12 months at room temperature ∆R % 0.015 0.003 0.1 0.03 Short term overload ∆R % 0.5 Climatic ∆R % 0.25 Derating from rated power at 70°C Zero at 155°C Climatic category Zero at 155°C 0.005 0.1 0.05 0.3 55/155/56 0.02 0.1 55/155/56 Long term damp heat ∆R % 0.25 Temperature rapid change ∆R % 0.04 0.02 0.2 0.05 Resistance to solder heat ∆R % 0.02 0.003 0.06 0.03 Vibration and bump ∆R % 0.2 0.002 0.06 0.02 Noise (in a decade of frequency) µV/V 0.1 0.03 1.0 0.1 Voltage coefficient of resistance ppm/V 0.05 0.5 <1 0.1 <1 *An 0.01 ahm addition to be added to the performance claims of all resistors <10R. Table of Resistance Restrictions Tolerance TCR RC55P ppm/°C 5 0.05% .1-.25% 10R to 500k 10R to 500k RC65P RC70P .5-1% 0.05% .1-.25% .5-1% 0.05% .1-.25% 1R to 500 10R to 500 10R to 500 1R to 500 10 10R to 1M 10R to 1M 1R to 1M 10R to 1M 10R to 1M 1R to 1M 10R to 1M 10R to 1M 10R to 1M 15 10R to 1M 5R to 1M 1R to 1M 10R to 1M 5R to 1M 1R to 1M 10R to 1M 10R to 2M 1R to 2M 25 10R to 1M 5R to 2M 1R to 2M 10R to 1M 5R to 2M 1R to 2M 10R to 1M 10R to 5M 1R to 5M 50 10R to 1M 5R to 2M 1R to 4M 10R to 1M 5R to 2M 1R to 4M 10R to 1M 5R to 10M 1R to 10M 100 10R to 1M 1R to 2M 1R to 4M 10R to 1M 1R to 2M 1R to 4M 10R to 1M 1R to 10M 1R to 10M Packaging The standard method of packaging RC55P resistors is taped in ammopacks. Taped resistors on reel or loose packed components can also be supplied by special request. The standard packaging for RC65P and RC70P resistors is loose in boxes. By special request the R65P components can also be supplied taped on reel or in ammopack. In the case of tape packed components the usable lead length is reduced by the width of the tape. 10R to 750k 10R to 750k .5-1% 1R to 750k Standard Quantities Per Package Type RC55P RC65P RC70P Small box 250 125 25 Large box 1000 500 250 Reel 5000 2500 Ammo pack 1000 1000 © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com Issue B · 03.02 177