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| High Value Thick Film Resistors GC Series Welwyn Components * * * * High working voltage to 10kV Value up to 1G ohm Custom product available High stability thick film Electrical Data GC55 Power rating at 70C Resistance range Limiting element voltage Isolation voltage TCR (20C to 70C) Resistance tolerance Values Thermal impedance Ambient temperature range C/watt C 140 watts ohms Volts dc or ac Peak volts ppm/C % 0.25 47k to 900 meg 1700 GC65 0.5 47k to 900 meg 3500 700 100 1, 2, 5 E24 & E96 preferred 90 - 55 to 155 70 GC70 1.0 47k to 1G 10000 Physical Data Dimensions (mm) and Weight (g) PCB mounting centres 10.2 13.7 20.3 Min bend radius 0.6 1.2 1.2 Wt nom. 0.3 0.6 1.1 d D L f Type GC55 GC65 GC70 L max. 6.2 9.0 14.5 D max. 2.5 3.6 5.3 f min. 21.0 19.6 23.6 d nom. 0.6 0.8 0.8 Construction Thick film material is fired on to high grade ceramic rods. Nickel plated steel caps are force fitted and the termination wires are welded to the caps. The value is obtained by a helical cut in the film and finally the resistor body is given a high temperature protective coating. Solderability The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2. Marking 1% tolerance resistors are colour coded with 5 bands, 2% and 5% tolerance have 4, IEC 62 colours are used. Terminations Material Strength Solder coated copper wire. The terminations satisfy the requirements of IEC 68.2.21. Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning fluids suitable for printed circuit boards. 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 199 High Value Thick Film Resistors GC Series Welwyn Components Performance Data Maximum Load at rated power: 1000 hrs at 70c Derating Overload Climatic Climatic category Temperature rapid change Resistance to Solder Heat Vibration and bump Voltage proof R% R% R% R% R% R% volts 1 0.2 0.1 1000 min. 1 1 55/155/56 0.15 0.03 0.02 R% 1 Zero at 155C 0.2 0.25 Typical 0.5 N.B. This product can be custom built to meet specific voltage coefficient or pulse requirements. Packaging The standard method of packaging GC resistors is taped in ammo packs. Taped resistors on reel or loose packed components can also be supplied by special request. In the case of tape packed components the usable lead length is reduced by the width of the tape. A detailed taping specification is available on request. Standard Quantities Per Spool/Box Type Taped (Reeled) Ammo pack Small box Large box GC55 5000 5000 250 1000 GC65 2500 2500 125 500 GC70 1500 1000 25 250 Figure 2 c f1 6 b f2 6 Body Location f1 - f2 1.4 mm Type GC55/GC65 GC70 b 52 67 c 5 10 (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 200 Issue B * 03.02 |
Price & Availability of GC70
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