High Value Thick Film Resistors Welwyn Components GC Series * * * * High working voltage to 10kV Value up to 1G ohm Custom product available High stability thick film Electrical Data GC55 GC65 Power rating at 70C watts 0.25 0.5 1.0 Resistance range ohms 47k to 900 meg 47k to 900 meg 47k to 1G 1700 3500 10000 Limiting element voltage Volts dc or ac Peak Isolation voltage volts TCR (20C to 70C) ppm/C Resistance tolerance % GC70 700 100 1, 2, 5 Values E24 & E96 preferred Thermal impedance C/watt Ambient temperature range 140 90 C 70 - 55 to 155 Physical Data Dimensions (mm) and Weight (g) PCB Min bend radius Wt nom. Type L max. D max. f min. d nom. mounting centres GC55 6.2 2.5 21.0 0.6 10.2 0.6 0.3 GC65 9.0 3.6 19.6 0.8 13.7 1.2 0.6 GC70 14.5 5.3 23.6 0.8 20.3 1.2 1.1 Construction Thick film material is fired on to high grade ceramic rods. Tin 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. d D L f 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 Solvent Resistance Material Solder coated copper wire. Strength The terminations satisfy the requirements of IEC 68.2.21. 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. (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 11.09 High Value Thick Film Resistors Welwyn Components GC Series Performance Data Maximum R% Load at rated power: 1000 hrs at 70c Typical 1 0.5 Derating Zero at 155C Overload R% 1 0.2 Climatic R% 1 0.25 Climatic category R% Temperature rapid change R% 1 0.15 Resistance to Solder Heat R% 0.2 0.03 Vibration and bump R% 0.1 Voltage proof volts 55/155/56 0.02 1000 min. 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. Type b c GC55/GC65 52 5 GC70 67 10 Figure 2 c f1 6 f2 b 6 Body Location f1 - f2 1.4 mm Ordering Procedure Example: GC55 at 4.7 megohms and 2% tolerance in ammo pack box of up to 5000 pieces GC55- 4M7GI Type Value (use IEC62 code) Tolerance (use IEC62 code) F G J 1% 2% 5% Packing I Ammo GC55 GC65 GC70 Up to 5000/box Up to 2500/box Up to 1000/box Standard (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 11.09