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MFP Datasheet(PDF) 2 Page - Welwyn Components Limited |
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MFP Datasheet(HTML) 2 Page - Welwyn Components Limited |
2 / 2 page Flameproof Power Metal Film Resistors MFP Series © 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 D · 03.06 Welwyn Components 144 Application Notes 1. If the resistors are to dissipate full rated power, it is recommended that the terminations should not be soldered closer than 4mm from the body. 2. Due to operating temperature limitations imposed by some pcb materials, derating may be necessary. An estimate of the temperature rise to be expected can be calculated using the thermal impedance figures given under Electrical Data. 3. MFP resistors an also be supplied pre-formed. b f1 f2 6 6 5 Body location f1 – f2 ≤ 1.4 mm Figure 1 Packaging MFP resistors are normally supplied tape packed ready for loading onto automatic sequencing and insertion machines. The standard taping method and critical dimensions are shown in Figure 1. Component wires will not protrude beyond the outside edge of the tapes. Alternative packaging available by request. Lead Formed resistors can also be supplied. Standard options of Lancet, Radial and Goalpost forming are shown in lead Form Information section. Maximum Load at rated power : 1000 hours at 70°C ∆R % 5 Shelf life : 12 months at room temperature ∆R % 2 Derating from rated power at 70°C ∆R % zero at 155°C Climatic ∆R % 3 Climatic category 50/155/56 Temperature rapid change ∆R % 0.5 Resistance to solder heat ∆R % 0.5 Voltage proof volts 500 min Performance Data Type MFP1 MFP2 Ammo pack 5000 2000 Standard Quantities Per Package Type MFP1 MFP2 b (mm) 52 68 |
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