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| Fusible Nickel Film Resistors FN Series Welwyn Components * Predictable fusing characteristics * Constant current fusing * Flameproof Electrical Data FN4 Power rating at 70C Resistance range TCR Resistance tolerance* Standard values Thermal impedance Ambient temperature range C/watt C watts ohms ppm/C % 0.4 0R1 to 20R See Figure 1 5, 10, 20 E24 preferred 215 -55 to 155 * Below 1R, 10 and 20% only. Physical Data Dimensions (mm) & Weight (g) PCB mounting centres 10.2 Min. bend radius 0.6 Wt. nom 0.3 Type FN4 L Max 6.2 D Max 2.5 f min 21.0 d nom 0.6 d D L f Construction The nickel film is deposited on a high purity ceramic rod. End caps are force fitted and termination wires welded to the caps. The resistive film is adjusted to the required value by a helical cut; finally the flame retardant lacquer protection is applied to the resistor body and the resistor is marked with an indelible ink. Marking Resistors are colour coded with five bands. Four of the bands are used to indicate value and tolerance, with IEC 62 colours being used. A fifth black band denotes constant current fusibility. Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. Terminations Material Strength Solder-coated copper wire. The terminations meet the requirements of IEC 68.2.21 Flammability The resistors will not burn or emit encandescent 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 168 Fusible Nickel Film Resistors FN Series Welwyn Components Performance Data Maximum Load: 1000 hours at 70C Shelf life: 12 months at room temperature Derating from rated power at 70C Long term damp heat Resistance to solder heat Fusing characteristics R% R% R% R% 1 0.5 zero at 155C 1 0.5 See Figure 2 Packaging All FN 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. Alternative packaging available by request. A detailed Packaging Data Sheet is available upon request. Lead Formed resistors can also be supplied. Standard options of Lancet, Radial and Goalpost forming are shown in Lead Form Information section Fusing After fusing the final resistance value will be 10 times the initial value. Standard Quantities Per Package Type Large ammo pack FN4 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 * 03.02 169 |
Price & Availability of FN
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