FMW TTELEC | Alldatasheet
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Fusible MELF Wirewound Resistors FMW Series General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics’ own data and is considered accurate at time of going to print. © TT Electronics plc BI Technologies IRC Welwyn www.ttelectronics.com/resistors 07.24 Electrical Data Features:
- UL1412 recognised fusing*
- Compact SMD format
- Flameproof wirewound technology
- Failsafe mains fusing at 120 / 240Vrms
- Specified surge performance All parts are Pb-free and comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3) Physical Data Construction A high quality ceramic substrate is assembled with interference fit, tin plated end caps. The resistive element is wound on the substrate and welded to the caps. Cement protection is applied to the resistor body before marking with indelible ink. Solderability The pure tin finish produces ageing free contacts on which low melting point solders can be used. Dipped area shall be covered with a smooth and bright solder coating after three seconds immersion at 245°C. Marking FMW resistors are marked with five colour bands on a green body. The first four indicate value and the fifth indicates tolerance in con- formance with IEC62. Solvent Resistance The component is resistant to all normal industrial cleaning solvents suitable for printed circuits. * UL file number E234469
Fusible MELF Wirewound Resistors FMW Series General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics’ own data and is considered accurate at time of going to print. © TT Electronics plc BI Technologies IRC Welwyn www.ttelectronics.com/resistors 07.24 Performance Data Temperature Derating Fusing Characteristic Pulse Energy Limits Surge Performance Recommended Solder Pads Note: After fusing the ohmic value is at least 100 times the initial value, provided initial power ≥ 28W is applied.
Fusible MELF Wirewound Resistors FMW Series General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics’ own data and is considered accurate at time of going to print. © TT Electronics plc BI Technologies IRC Welwyn www.ttelectronics.com/resistors 07.24 Ordering Procedure Example: FMW0309-47RJT2 (47 ohms ±5%, Pb-free) Packaging Application Notes For the purposes of UL approval and safe fusing performance, the following points should be observed: 1. To protect against fire under all conditions of overload, a positive clearance of 13mm should be provided between the body of the resistor and any combustible materials. 2. If a possible failure mode leads to overload below the minimum fusing power or to a maximum fusing time exceeding 5s, then it is strongly recommended that a PCB cutout be provided between the mounting pads in order to avoid overheating of FR4 material. 3. A positive clearance of 13mm should be provided between the resistor and uninsulated parts of opposite polarity or uninsulated dead metal parts. 4. Limited Short Circuit testing should be performed in the complete appliance.