FM WELWYN | Alldatasheet
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Technical content
- Predictable fusing characteristics Flameproof protection FM1/4 FM1/2 FM1 0.15.052.0sttawC˚07 ta gnitar rewoP 5K1 - 2R0K72 - 1R0K01 - 1R0smhoegnar ecnatsiseR 053053052stlovegatlov tnemele gnitimiL 052C˚/mppRCT 5%ecnarelot ecnatsiseR Standard values E24 preferred 001021051ttaw/C˚ecnadepmi lamrehT 551 ot 55-C˚egnar erutarepmet tneibmA 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. © 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 Electrical Data Issue B · 03.02 A subsidiary of TT electronics plc Welwyn Components 164 Dimensions (mm) & Weight (g) PCB Min. mounting bend Type L max D max f min d nom centres radius Wt. nom Physical Data LD f d 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. Terminations Material Solder-coated copper wire. Strength The terminations meet the requirements of IEC 68.2.21. Solderability The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2. 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 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. 2.5 Issue C · 01.07
© 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 Welwyn Components 165 Maximum Load: 1000 hours at 70˚C 3%R Shelf life: 12 months at room temperature 2%R C˚551 ta orezC˚07 ta rewop detar morf gnitareD Temperature rapid change 5.0%R Resistance to solder heat 5.0%R Performance Data f1 f2 Body Location f1 – f2 1.4 mm Fusing After fusing the final resistance value will be 50 times the initial value. 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 Type FM 1/4 FM1/2 FM1 Large ammo pack 5000 2500 1500 Standard Quantities Per Package FM1 Fuse Times FM1/2 Fuse Times FM1/4 Fuse Times Initial Power (W) Initial Power (W) Initial Power (W) Pulse Time (seconds) Pulse Time (seconds)Pulse Time (seconds) Issue C · 01.07