Precision Metal Film Resistors Welwyn Components RCP series s Precision resistors with uprated power s Low TCRs over a wide resistance range s Tolerance down to 0.05% s Low noise and negligible voltage coefficient s Express delivery available Electrical Data RC55P RC65P RC70P Power rating at 70C 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 +70C) & codes ppm/C Resistance tolerance (code) % 5(V), 10(T), 15(Y), 25(D), 50(C), 100(Z) 0.05(W), 0.1(B), 0.25(C) & 0.5(D) See resistance restrictions E24, E96 preferred Any value to order Standard values Thermal impedance C/watt Ambient temperature range 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. (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 176 A subsidiary of TT electronics plc 07.11 Precision Metal Film Resistors Welwyn Components RCP series Application Notes Matched Sets and Networks Welwyn has many years experience in the supply of matched sets of precision resistors. The individual resistors within a set or module can be manufactured with a tolerance of 0.05% and a TCR of 5ppm/C. 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 Load at rated power : 1000 hrs at 70C R % Dry heat : 1000 hrs at 155C R % Shelf life : 12 months at room temperature R % RC55P Values 10 100k Other Values/Styles Actual Performance *Actual Performance Maximum Typical Maximum Typical 0.10 0.03 0.5 0.1 0.3 0.1 1.0 0.15 0.015 0.003 0.1 0.03 Derating from rated power at 70C Zero at 155C Zero at 155C Short term overload R % 0.5 0.005 0.1 Climatic R % 0.25 0.05 0.3 Climatic category 55/155/56 0.02 0.1 55/155/56 Long term damp heat R % 0.25 0.05 0.5 0.1 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) V/V 0.1 0.03 1.0 0.1 Voltage coefficient of resistance ppm/V <1 <1 *An 0.01 ahm addition to be added to the performance claims of all resistors <10R. Table of Resistance Restrictions Tolerance TCR ppm/C 5 1 RC55 0.05% 0.1 - 0.25% 10R to 500K 10R to 500K RC65 0.5% 3 1R to 500K 0.05% 0.1 - 0.25% 10R to 500K 10R to 500K RC70 0.5% 0.05% 3 1R to 500K 0.1 - 0.25% 0.5%3 10R to 750K 10R to 750K 10R to 750K 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 1R to 1M 15 10R to 1M 2R49 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 2R49 to 2M 1R to 2M 10R to 1M 5R to 2M 1R to 2M 10R to 1M 10R to 5M 1R to 5M 50 1002 10R to 1M 10R to 1M 2R49 to 2M 1R to 2M 1R to 4M 1R to 4M 10R to 1M 10R to 1M 5R to 2M 1R to 2M 1R to 4M 1R to 4M 10R to 1M 10R to 1M 5R to 10M 1R to 10M 1R to 10M 1R to 10M 2 Note1: 1. Based on sampling. 100% screened product is available. 2. For maximum availability, where the ohmic value permits, 25ppm/C is preferred to 50 or 100ppm/C. 3. For maximum availability, where the ohmic value permits, 0.25% is preferred to 0.5%. 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. (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 07.11 Precision Metal Film Resistors Welwyn Components RCP series Ordering Procedure Example: RC55P with TCR of 5ppm/C at 31.6 kilohms and 0.1% tolerance in an ammo pack box of up to 1000 pieces RC55PV- 31K6BI Type TCR V T 5 ppm/ C 10 ppm/ C Y D 15 ppm/ C 25 ppm/ C C Z 50ppm/ C 100ppm/ C Value (use IEC62 code) Tolerance (use IEC62 code) W B C D 0.05% 0.1% 0.25% 0.5% Packing I Ammo Bulk RC55P, RC65P RC70P Up to 1000/box 250/box Standard For 5ppm/C screened product, replace the packing suffix with SC. Example: RC55PV-31K6BSC (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 07.11