confusing MOSFET prices

Discussion in 'General Electronics Chat' started by bob800, Dec 15, 2013.

  1. bob800

    Thread Starter Member

    Dec 10, 2011
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    On Mouser, the first result for "IRFP450" costs almost $10/ea: http://www.mouser.com/ProductDetail/Vishay-Siliconix/IRFP450/?qs=sGAEpiMZZMshyDBzk1%2fWizSW%252bwlCH%2fhMNDz4UodUBMI%3d

    However, they also sell a lead-free version which costs $3/ea: http://www.mouser.com/ProductDetail...=sGAEpiMZZMshyDBzk1/Wi1F3z9PgzPBnCSufrOup6kg=

    Why is latter so much cheaper? Is there a quality difference? All the specs look the same--in fact it even looks like the response time is faster on the $3 version.

    Also, would I be correct in assuming I could solder with PbSn on the lead-free MOSFET?
     
  2. alfacliff

    Well-Known Member

    Dec 13, 2013
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    the price depends on the number sold, the lead free sells better now, so has a better price. yes you can use lead type solder to solder to lead free parts.
     
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  3. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    Note the difference between IRFP450 and IRFP450A. The A version has some better parameters, which hints that is being made using some newer process / technolgoy. This basically means that the non-A versions are old, possibly no longer manufactured, and thus their price is higher.
    PBF meand Pb free, but the A before it is the important part.
     
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  4. bob800

    Thread Starter Member

    Dec 10, 2011
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    ... but the A version is the cheaper one...?
     
  5. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    The key is that the new A versions are what is currently produced and likely are produced in high volume.
    On the other hand the non-A are old and fewer are made, if any at all, which makes their price go up.

    Another factor could be that the new process used to make the A versions is somehow faster or cheaper to do than the process used to make the old ones.
     
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  6. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Marketing sets the pricing, not engineering. Any more questions about pricing not making sense?
     
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  7. bob800

    Thread Starter Member

    Dec 10, 2011
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    OK thanks... I just wanted to make sure I wasn't missing anything on the technical side.
     
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