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 Precision Metal Film Resistors
RC series
Welwyn Components
* 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
Electrical Data
RC55 Commercial Power rating at 70C Resistance range Limiting element voltage Isolation voltage TCR (20 to +70C) & codes Resistance tolerance Approved CECC 40101-004 Power rating at 70C Resistance range Limiting element voltage Isolation voltage TCR & codes Resistance tolerance (code) Approved CECC 40101-804 Power rating at 70C Resistance range Limiting element voltage Isolation voltage TCR & codes Resistance tolerance (code) Standard values Thermal impedance Ambient temperature range C/watt C 110 watts ohms volts volts ppm/C % watts volts volts ppm/C % A 0.125 1R to 1M 200 280 B 0.25 1R to 1M 250 350 watts ohms volts volts ppm/C % H 0.063 200 280 J 0.125 200 280 0.25 1R to 4M 350 500 0.5 1R to 4M 350 500 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) K 0.25 250 350 K 0.25 10R to 1M 250 350 15(Y), 25(D), 50(C) & 100(Z) 0.05(W), 0.1(B), 0.25(C), 0.5(D) & 1(F) B 0.25 10R to 1M 250 350 15(T), 25(E) & 50(C) 0.05(W), 0.1(B), 0.25(C), 0.5(D) & 1(F) E24, E96 preferred 70 -55 to +155 60 C 0.5 10R to 1M 350 500 See resistance restrictions Any value to order L 0.5 10R to 1M 350 500 See resistance restrictions 1.0 1R to 10M 500 700 See resistance restrictions RC65 RC70 Notes
ohms 1R to 1M 1R to 1M 1R to 1M
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
(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
173
Precision Metal Film Resistors
RC series
Welwyn Components
Physical Data
Dimensions (mm) & Weight (g) PCB mounting Type RC55 RC65 RC70 L max 7.2 10.0 15.5 D max 2.5 3.7 5.5 f min 30 30 30 d nom 0.6 0.6 0.8 centres 10.2 12.7 18.4 Min. Bend Radius 0.6 0.6 1.2 Wt. nom 0.24 0.40 1.15
d
D
L
f
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.
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.
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 Load at commercial rating: 1000 hours at 70C Load at CECC rating: 1000 hours at 70C Dry heat: 1000 hours at 155C Shelf life: 12 months at room temperature Derating from rated power at 70C 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% V/V ppm/V R% R% R% R% R% R% 0.5 0.5 Not specified Zero at 155C 0.1 0.5 55/155/56 0.5 0.1 0.1 0.1 Not specified Not specified 0.5 0.5 Not specified 50% at 125C 0.1 0.5 55/125/56 0.5 0.1 0.1 0.1 Not specified Not specified 0.1 0.3 55/155/56 0.5 **0.2 0.06 0.06 1.0 0.1 0.05 0.03 0.02 0.1 <1 0.02 0.1 Requirements *Actual Performance Maximum 0.3 0.3 **1.0 0.1 Typical 0.1 0.05 0.15 0.03
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
Issue B * 03.02
Precision Metal Film Resistors
RC series
Welwyn Components
Table of Resistance Restrictions
Tolerance TCR ppm/C 5 10 15 25 50 100 0.05% 10 to 500k 10 to 1M 10 to 1M 10 to 1M 10 to 1M 10 to 1M RC55 .1 - .25% 10 to 500k 10 to 1M 5 to 1M 5 to 2M 5 to 2M 1 to 2M .5 - 1% 1 to 500k 1 to 1M 1 to 1M 1 to 2M 1 to 4M 1 to 4M 0.05% 10 to 500k 10 to 1M 10 to 1M 10 to 1M 10 to 1M 10 to 1M RC65 .1 - .25% 10 to 500k 10 to 1M 5 to 1M 5 to 2M 5 to 2M 1 to 2M .5 - 1% 1 to 500k 1 to 1M 1 to 1M 1 to 2M 1 to 4M 1 to 4M 0.05% 10 to 750k 10 to 1M 10 to 1M 10 to 1M 10 to 1M 10 to 1M RC70 .1 - .25% 10 to 750k 10 to 1M 10 to 2M 10 to 5M 5 to 10M 1 to 10M .5 - 1% 1 to 750k 1 to 1M 1 to 2M 1 to 5M 1 to 10M 1 to 10M
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. A low inductance version is available at 1% tolerance. For low inductance version add suffix N.
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.
5
f1 6 52
1
f2 6 - f 2 1.4 mm
Body location f
Standard Quantities Per Package
Type Small box Large box Reel Large ammo pack RC55 250 1000 5000 1000 RC65 125 500 2500 1000 RC70 250 250 -
(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
Issue B * 03.02
175


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