Precision Metal Film Resistors Welwyn Components RC series s CECC released products with low TCRs over a wide resistance range s Resistance tolerance down to 0.05% s Express delivery available s Low noise and negligible voltage coefficient s Screened parts available for critical applications Electrical Data RC55 RC65 RC70 Notes Commercial Power rating at 70C watts Resistance range ohm 0.25 0.5 2R49 to 2M 5R to 2M 1.0 10R to 5M Limiting element voltage volts 350 350 500 Isolation voltage volts 500 500 700 TCR (20 to +70C) & codes ppm/C 5(V), 10(T), 15(Y) & 25(D) See resistance % 0.05(W), 0.1(B) & 0.25(C) restrictions Resistance tolerance CECC 40101-004 Requirements H J K 0.063 0.125 0.25 Power rating at 70C watts Resistance range ohms 1R to 1M 1R to 1M 1R to 1M K L 0.25 0.5 10R to 1M 10R to 1M Limiting element voltage volts 200 200 250 250 350 Isolation voltage volts 280 280 350 350 500 TCR & codes ppm/C Resistance tolerance (code) % CECC 40101-804 Requirements 15(Y) & 25(D) See resistance 0.05(W), 0.1(B) & 0.25(C) restrictions A B B C Power rating at 70C watts 0.125 0.25 0.25 0.5 Resistance range 10R to 1M ohms 1R to 1M 1R to 1M 10R to 1M Limiting element voltage volts 200 250 250 350 Isolation voltage volts 280 350 350 500 TCR & codes Resistance tolerance (code) ppm/C % 15(T) & 25(E) See resistance 0.05(W), 0.1(B) & 0.25(C) restrictions These tables indicate the CECC specification requirements, and these are met or exceeded by the corresponding RC series products. Standard values Thermal impedance Ambient temperature range E24, E96 preferred C/watt 110 C 70 Any value 60 to order -55 to +155 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 A subsidiary of TT electronics plc 08 . 10 173 Precision Metal Film Resistors Welwyn Components RC series Physical Data Dimensions (mm) & Weight (g) PCB Min. mounting Bend Type L max D max f min d nom centres Radius Wt. nom RC55 7.2 2.5 30 0.6 10.2 0.6 0.24 RC65 10.0 3.7 30 0.6 12.7 0.6 0.40 RC70 15.5 5.5 30 0.8 18.4 1.2 1.15 d D L Construction Marking 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. Type reference, TCR code, resistance value and tolerance code. f The resistance values conform to IEC 62. The resistor is adjusted to value by a helical cut in the film and the body is protected with a specially formulated epoxy coating. 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 Requirements Typical 0.3 0.1 Load at commercial rating: 1000 hours at 70C R% Load at CECC rating: 1000 hours at 70C R% 0.5 0.5 0.3 0.05 Dry heat: 1000 hours at 155C R% 0.5 0.5 **1.0 0.15 Shelf life: 12 months at room temperature R% 0.1 0.03 Derating from rated power at 70C Short term overload R% Climatic R% Climatic category Not specified Not specified Zero at 155C 50% at 125C 0.1 0.1 50% at 125C & Zero at 155C 0.1 0.02 0.1 0.5 0.5 0.3 55/155/56 55/125/56 55/155/56 Long term damp heat R% 0.5 0.5 0.5 Temperature rapid change R% 0.1 0.1 **0.2 0.05 Resistance to solder heat R% 0.1 0.1 0.06 0.03 0.1 Vibration and bump R% 0.1 0.1 0.06 0.02 Noise (in a decade of frequency) V/V Not specified Not specified 1.0 0.1 Voltage coefficient of resistance ppm/V Not specified Not specified Note: *An 0.01 ohm addition to be added to the performance claims of all resistors <10R. ** All products within the specified approved range meet CECC requirements. (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 174 *Actual Performance Maximum <1 Precision Metal Film Resistors Welwyn Components RC series Table of Resistance Restrictions Tolerance TCR RC55 RC65 RC70 ppm/C 0.05% 51 10 to 500k 10 to 500k 10 to 500k 10 to 500k 10 to 750k 10 to 750k 10 10 to 1M 10 to 1M 10 to 1M 10 to 1M 10 to 1M 10 to 1M 15 10 to 1M 2R49 - 1M 10 to 1M 5 to 1M 10 to 1M 10 to 2M 25 10 to 1M 2R49 - 2M 10 to 1M 5 to 2M 10 to 1M 10 to 5M .1 - .25% 0.05% .1 - .25% 0.05% .1 - .25% Note1: based on sampling. 100% screened product is available. Application Notes Packaging Matched Sets and Networks Welwyn has many years experience in the supply of matched set 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 standard method of packaging RC55 resistors is taped in ammo packs. Taped resistors on reel or loose packed components can also be supplied by special request. The standard packaging for RC65 and RC70 resistors is loose in boxes. By special request the RC65 components can also be supplied taped on reel or in ammo pack. In the case of tape packed components the usable lead length is reduced by the width of the tape. The individual resistors within a set or module can be manufactured with a tolerance of 0.05% and TCR of 5ppm/C. 5 A low inductance version is available at 1% tolerance. For low inductance version add suffix N. f1 6 f2 52 6 Body location f1 - f2 1.4 mm Ordering Procedure Example: RC55 with TCR of 5ppm/ C at 31.6 kilohms and 0.1% tolerance in an ammo pack box of up to 1000 pieces RC55 V- 31K6BI Type Trim option Standard Non-inductive N TCR V T 5 ppm/ C 10 ppm/ C All tolerances 1% only Y D 15 ppm/ C 25 ppm/ C Value (use IEC62 code) Tolerance (use IEC62 code) W B C 0.05% 0.1% 0.25% Packing I Ammo Bulk RC55, RC65 RC70 Up to1000/box 250/box Standard For CECC released product state on order the CECC numb er and style. Example: RC55Y-31K6BI CECC40101-004 JY For CECC 40101-804 the TCR codes T and E relate to 15 and 25ppm/C and are coded in the MPN as Y and D respectively Example: RC65Y-31K6BI CECC 40101-804BT For SnPb finish instead of Pb-free replace the packing suffix with PB. Example: RC55V-31K6BPB For 5ppm/C screened product, replace the packing suffix with SC. Example: RC55V-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 . 175