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I have been doing some net-surfing on Farnell's website and stumbled upon a section called

MELF Surface Mount Resistors

MELF Resistor

According to Wikipedia, this package family has a rather funnily sounding de-abbreviation Most End up Lying on the Floor, since they are extremely easy to lose. This may be due to the fact that they are cylindrical... I myself have lost quite a few of such diodes.

Wiki says, that there are three basic sizes. MELF, MiniMELF, MicroMelf - the two latter are in the power-rating range of 0603/0805 resistors. The 1W MELF package is obviously useful for dissipation reasons.

So my question is, why on Earth would anybody design a board containing small MELF components, since they can easily be replaced with more modern flat parts? I cannot see a single advantage. Please prove me wrong.

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The cylindrical construction of MELF devices provides an optimal power rating and pulse load capability related to the mounting space. Continuous development has led to improved long-term stability and moisture resistance, and allows high-temperature operation to + 175 °C.

This paper explores why this resistor series has become so successful, and why there is often no alternative to it today in professional applications.

Vishay

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  • \$\begingroup\$ Second Google hit... How could I have missed that... \$\endgroup\$
    – Dzarda
    Jan 29 '14 at 17:10
  • \$\begingroup\$ Yes, you miss the +1 too. The paper title says MELF Resistors - The World’s Most Reliable and Predictable, High-Performing Film Resistors your funny jokes stop :) \$\endgroup\$ Jan 29 '14 at 17:13
  • \$\begingroup\$ Fair enough.... \$\endgroup\$
    – Dzarda
    Jan 29 '14 at 17:15

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