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| Fusible Carbon Film Resistors FC4 Welwyn Components * Predictable fusing characteristics * Constant voltage fusing characteristics * Fuses at very low powers * Flame retardant lacquer Electrical Data FC4 Power rating at 70C Resistance range TCR Resistance tolerance Standard values Thermal impedance Ambient temperature range C/watt C watts ohms ppm/C % 0.33 1R0-5K1 300 5, 10 E24 preferred 215 -55 to 125 Physical Data Dimensions (mm) & Weight (g) PCB mounting centres 10.2 Min. bend radius 0.6 Type FC4 L Max 6.2 D Max 2.5 f min 21.0 d nom 0.6 Wt.nom 0.3 d D L f Construction The carbon film is deposited on a high purity ceramic rod. End caps are fitted and termination wires welded to the caps. The resistive film is adjusted to the required value by a special helical cut; finally the flame retardant lacquer protection is applied to the resistor body and marked with an indelible ink. Marking Resistance value and tolerances are identified in accordance with IEC62.4 - band colour code. A fifth (yellow) band denotes that the product is fusible and suitable for use in constant voltage applications. Solvent Resistance Terminations Material Strength Solder-coated copper wire. The terminations meet the requirements of IEC 68.2.21 The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. Flammability The resistor coating will not burn or emit incandescent particles under any condition of applied temperature or power overload. Solderability The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2 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 166 Fusible Carbon Film Resistor FC4 Welwyn Components Performance Data Maximum Load 1000 hrs at 70C Derating from rated power at 70C Climatic Climatic category Temperature rapid change Resistance to solder heat Vibration and bump Isolation resistance R% R% R% ohms R% 1.0 - 1k >1k to 5.1k R% 0.2 0.8 zero at 125C 0.5 40/125/56 0.25 0.5 0.1 >1G Graph 1 100 50 40 30 20 10 5.0 2.0 1.0 0.5 0.1 Fusing Characteristics (constant voltage) Graph 2 2 GRAPH 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 0 1 Maximum permissable applied voltage Maximum Fusing Voltage MAXIMUM FUSING VOLTAGE GRAPH 1 FUSING CHARACTERISTICS (constant voltage) Fusing time (seconds) 3.5 5 10 15 Applied power (watts) 10 100 Resistance value (ohms) 1k Packaging All FC resistors are supplied tape packed ready for loading on to automatic sequencing and insertion machines. Component wires will not protrude beyond the outside edge of the tapes. Lead formed resistors can also be supplied. Standard options of Lancet, Radial and Goalpost forming are shown in Lead Form Information section. Alternative packaging available by request. Standard Quantities Per Package Type Ammo pack FC4 5000 5 f1 6 52 f2 6 Body location f1 - f2 1.4 mm (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 * 03.02 167 |
Price & Availability of FC4
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