RC55 ETC

Document overview

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Technical content

Power rating at 70°C watts 0.25 0.5 1.0 Resistance range ohms 1R to 4M 1R to 4M 1R to 10M Limiting element voltage volts 350 350 500 Isolation voltage volts 500 500 700 TCR (20 to +70°C) & codes ppm/°C 5(V), 10(T), 15(Y), 25(D), 50(C) & 100(Z) See resistance Resistance tolerance % 0.05(W), 0.1(B), 0.25(C), 0.5(D) & 1(F) restrictions APPROVED CECC 40101-004 H J K K L Resistance range ohms 1R to 1M 1R to 1M 1R to 1M 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 15(Y), 25(D), 50(C) & 100(Z) See resistance Resistance tolerance (code) % 0.05(W), 0.1(B), 0.25(C), 0.5(D) & 1(F) restrictions APPROVED CECC 40101-804 A B B C Power rating at 70°C watts 0.125 0.25 0.25 0.5 Resistance range ohms 1R to 1M 1R to 1M 10R to 1M 10R to 1M Limiting element voltage volts 200 250 250 350 Isolation voltage volts 280 350 350 500 TCR & codes ppm/°C 15(T), 25(E) & 50(C) See resistance Resistance tolerance (code) % 0.05(W), 0.1(B), 0.25(C), 0.5(D) & 1(F) restrictions Standard values E24, E96 preferred Any value Thermal impedance °C/watt 110 70 60 to order Ambient temperature range °C -55 to +155 © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, England Tel: 01670 822181 Fax: 01670 829465 Web: http://www.Welwyn-TT.co.uk Issue A 07/9 9 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. Precision Metal Film Resistors RC SERIES

  • 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 173

CECC 40101-004 CECC 40101-804 *ACTUAL PERFORMANCE REQUIREMENTS REQUIREMENTS MAXIMUM TYPICAL Load at commercial rating: 1000 hours at 70°C ∆R% 0.3 0.1 Load at CECC rating: 1000 hours at 70°C ∆R% 0.5 0.5 0.3 0.05 Dry heat: 1000 hours at 155°C ∆R% 0.5 0.5 1.0 0.15 Shelf life: 12 months at room temperature ∆R% Not specified Not specified 0.1 0.03 Derating from rated power at 70°C Zero at 155°C 50% at 125°C Short term overload ∆R% 0.1 0.1 0.1 0.02 Climatic ∆R% 0.5 0.5 0.3 0.1 Climatic category 55/155/56 55/125/56 55/155/56 Long term damp heat ∆R% 0.5 0.5 0.5 0.1 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 Vibration and bump ∆R% 0.1 0.1 0.06 0.02 Noise (in a decade of frequency) µV/V Not specified Not specified 1.0 0.1 Voltage coefficient of resistance ppm/V Not specified Not specified <1 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. Precision Metal Film Resistors RC SERIES © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, England Tel: 01670 822181 Fax: 01670 829465 Web: http://www.Welwyn-TT.co.uk Issue A 07/9 9 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. TERMINATIONS Material Solder coated copper wire Strength The terminations meet the requirements of IEC 68.2.21. Solderability The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2. 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. Physical Data Dimensions (mm) & Weight (g) PCB Min. mounting Bend Type L max D max f min d nom centres Radius Wt. nom LD f d 174

STANDARD QUANTITIES PER PACKAGE Type RC55 RC65 RC70 Small Box 250 125 25 Large Box 1000 500 250 Reel 5000 2500 - Large Ammo Pack 1000 1000 - Precision Metal Film Resistors RC SERIES © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, England Tel: 01670 822181 Fax: 01670 829465 Web: http://www.Welwyn-TT.co.uk Issue A 07/9 9 APPLICATION NOTES 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 individual resistors within a set or module can be manufactured with a tolerance of ±0.05% and TCR of ±5ppm/°C. PACKAGING 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. Table of Resistance Restrictions TOLERANCE TCR RC55 RC65 RC70 5 10 to 500k 10 to 500k 1 to 500k 10 to 500k 10 to 500k 1 to 500k 10 to 750k 10 to 750k 1 to 750k 10 10 to 1M 10 to 1M 1 to 1M 10 to 1M 10 to 1M 1 to 1M 10 to 1M 10 to 1M 1 to 1M 15 10 to 1M 5 to 1M 1 to 1M 10 to 1M 5 to 1M 1 to 1M 10 to 1M 10 to 2M 1 to 2M 25 10 to 1M 5 to 2M 1 to 2M 10 to 1M 5 to 2M 1 to 2M 10 to 1M 10 to 5M 1 to 5M 50 10 to 1M 5 to 2M 1 to 4M 10 to 1M 5 to 2M 1 to 4M 10 to 1M 5 to 10M 1 to 10M 100 10 to 1M 1 to 2M 1 to 4M 10 to 1M 1 to 2M 1 to 4M 10 to 1M 1 to 10M 1 to 10M f1 f2 Body location f1 – f2 ≤ 1.4 mm 175