General Purpose Carbon Film Resistors GCF Series Drop in replacement for CF/CR Low cost Extensive resistance range Wide range of sizes and power ratings RoHS compliant Electrical Data GCF¼ GCF¼S GCF½ GCF½S GCF1 GCF1S GCF2 GCF2S GCF3S 0.25 0.25 0.5 0.5 1 1 2 2 3 Power rating @70°C watts Resistance range ohms 1R0-1M0 1R0-10M 1R0-1M0 1R0-10M 1R0-10M 1R0-10M 1R0-10M 1R0-10M 1R0-10M 1R0-10M 0.125 Limiting element voltage volts 200 250 200 350 250 500 400 500 500 500 Max overload voltage volts 400 500 400 700 500 1000 700 1000 800 1000 volts 300 500 300 700 500 1000 700 1000 700 1000 Dielectric withstanding voltage TCR ppm/°C Resistance tolerance <10R : 0±350 <10R ~ <60K : 0 ~ -500 <60K ~ <200K : 0 ~ -700 <200K ~ <1M0 : 0 ~ -1000 <1M0K ~ 10M : 0 ~ -1500 ±5 % Standard values E24 Ambient temperature range °C -55 to +155 Note: 'S' denotes smaller body size - see physical data Physical Data min. Bend Radius Wt. nom. 7.6 0.5 0.1 0.55 10.2 0.55 0.3 25 0.5 7.6 0.5 0.1 3.5 25 0.6 15.2 0.6 0.55 6.8 3 25 0.55 10.2 0.55 0.35 16 5.5 25 0.8 20.3 1.2 1.0 GCF1S 12 5 25 0.63 17.8 0.6 0.65 GCF2 17.5 6.5 25 0.8 22.9 1.2 1.2 GCF2S 16 5.5 25 0.8 20.3 1.2 1.0 GCF3S 17.5 6.5 25 0.8 22.9 1.2 1.2 L max D max f min d ± 0.10 GCF1/8 3.5 1.85 25 0.5 GCF¼ 6.8 2.5 25 GCF¼S 3.5 1.85 GCF½ 10 GCF½S GCF1 PCB mounting centres d D L f General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyns own data and is considered accurate at time of going to print. © Welwyn Components Limited Bedlington Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: [email protected] Website: www.welwyn-tt.com A subsidiary of TT electronics plc Issue D . 11.06 GCF Series Construction A carbon film is deposited onto a ceramic former. Plated steel caps are then fitted before the resistor is adjusted to value by a helical cut in the film. Termination wires are then welded to the caps and the body of the resistor is protected with an epoxy coating. Terminations Material Hot tin dipped copper wire. Strength The terminations meet the requirements of IEC 68.2.21 SolderabilityThe terminations meet the requirements of IEC 115-1,Clause 4.17.3.2 Marketing Resistance value and tolerance are identified in accordance with IEC 62 4-band colour code. Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. Performance Data Maximum Change Load life DR% 3 Load life in humidity DR% DR% 5 Temperature rapaid change 1 + 0.05W Zero at 155°C Derating from rated power at 70°C Short term overload 1 + 0.05W DR% No evidence of mechanical damage Terminal strength Resistance to solder heat DR% 1 + 0.05W Solderability Minimum of 95% coverage Resistance to solder heat Insulation resistance Dielectric withstanding No deterioration of protective coating and marking min 1000M No evidence of flahover, mechanical damage, arcing of insulation breakdown © Welwyn Components Limited Bedlington Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: [email protected] Website: www.welwyn-tt.com Issue A . 11.06 GCF Series Packaging All GCF resistors are supplied ammo tape packed ready for loading on to automatic sequencing and insertion machines. Component wires will not protrude beyond the outside edge of the tapes. Alternative packaging available by request GCF ¼ ¼S ½ ½S 1 1S 2 2S 3S W 52 52 52 52 52 52 52 67 67 67 B 5 5 5 5 5 10 5 10 10 10 B Body location f1-f2 < 1.4mm 6 f1 f2 W 6 Application Notes If the resistors are to dissipate full rated power, it is recommended that the terminations should not be soldered closer than 4mm from the body. Due to operating temperature limits imposed by some PCB materials, derating may be necessary. GCF resistors can also be supplied with radial, goalpost or lancet pre-formed leads. Consult Factory for details. Goalpost Radial Lanset Ordering Procedure Example: GCF1/4 small size at 10 kilohms and 5% tolerance and ammo packed in a box with a standard quantity of 5000pcs. GCF1 / 4S 10K J A5 Type Value (use IEC62 code) Tolerance (use IEC62 code) J 5% Packing A5 A1 A05 Ammo Pack GCF1 8 , GCF1 4 , GCF1 4 S, GCF1 2 S, 5000 / Box GCF1 2 , 1000 / Box GCF1, GCF1S, GCF2S GCF2, GCF3S © Welwyn Components Limited Bedlington Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: [email protected] Website: www.welwyn-tt.com 500 / Box Issue A . 11.06