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| Fusible Metal Film Resistors FM Series Welwyn Components * Predictable fusing characteristics * Flameproof protection Electrical Data FM1/4 Power rating at 70 C Resistance range Limiting element voltage TCR Resistance tolerance Standard values Thermal impedance Ambient temperature range C/watt C 150 watts ohms volts ppm/ C % 0.25 0R1 - 10K 250 FM1/2 0.5 0R1 - 27K 350 250 5 E24 preferred 120 -55 to 155 100 FM1 1.0 0R2 - 1K5 350 Physical Data Dimensions (mm) & Weight (g) PCB Type FM1/4 FM1/2 FM1 L max 6.2 9.0 12.5 D max 2.5 2.3 3.4 4.2 f min 21.0 19.6 17.8 d nom 0.6 0.8 0.8 mounting centres 10.2 12.7 18.4 Min. bend radius 0.6 1.2 1.2 Wt. nom 0.3 0.6 0.9 d D L f Construction The metal 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 special helical cut; finally the cement protection is applied to the resistor body and marked with 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 yellow band denotes constant voltage fusibility. 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 resistors 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 C * 03.02 B 01.07 (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 164 Fusible Metal Film Resistors FM Series Welwyn Components Performance Data Maximum Load: 1000 hours at 70C Shelf life: 12 months at room temperature Derating from rated power at 70 C Temperature rapid change Resistance to solder heat R% R% R% R% 3 2 zero at 155 C 0.5 0.5 FM1 Fuse Times FM1/2 Fuse Times Pulse Time (seconds) Pulse Time (seconds) Initial Power (W) Initial Power (W) Packaging All resistors are supplied tape packed ready for loading on to automatic sequencing and insertion machines. The standard taping method and critical dimensions are shown in figure 1. Component wire 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. A detailed Packaging Data Sheet is available on request. Figure 1 Pulse Time (seconds) FM1/4 Fuse Times Initial Power (W) Fusing After fusing the final resistance value will be 50 times the initial value. 5 f1 6 52 Body Location f1 - f2 f2 6 1.4 mm Standard Quantities Per Package Type Large ammo pack FM1/4 5000 FM1/2 2500 FM1 1500 (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 B 01.07 Issue C * 03.02 165 |
Price & Availability of FM1
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