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Surface mount heatsinks

Discussion in 'General Electronics Discussion' started by jackorocko, Dec 21, 2011.

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  1. jackorocko

    jackorocko

    1,284
    1
    Apr 4, 2010
    http://www.ohmite.com/catalog/pdf/d-sink.pdf

    How does one go about soldering these onto a pcb? My first thought was heating up the ends of the tin rods, but after looking at my boards, this is gonna be nearly impossible since I have surface mount devices within an 1/8th inch of those tin ends.

    Could I put solder on the board and then heat the heatsink up to a temperature beyond the melting point of solder and quickly set it into place and hope the solder melts before the heatsink cools to much?
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,252
    2,705
    Jan 21, 2010
    A reflow oven is probably the best bet.
     
  3. OLIVE2222

    OLIVE2222

    690
    25
    Oct 2, 2011
    Hi,

    Yes reflow is the normal method however smaller components can suffer a lot because of the higher temperature to be used. Having 0402 sized components in the neighborhood of large ceramic QFN or BGA packages can already make them fail (immediately or in a very short term). Is there any manufacturer recommendation?

    Olivier
     
  4. jackorocko

    jackorocko

    1,284
    1
    Apr 4, 2010
    http://www.avayanelectronics.com/Products/AE-STPR8811/AE-MDL-STPR8811_Manual.pdf

    There is no specific instructions. Would it be unwise of me to use a heatsink that was glued to the top of the DRV8811 with thermal paste instead of this surface mount heatsink? From the datasheet I find it hard to believe this specific SMHS is actually doing to much since the distance from the bottom of the heatsink to the top of the DRV8811 would be a few mm of air.

    http://www.avayanelectronics.com/Products/AE-STPR8811/ae-stpr8811.html
     
    Last edited: Dec 21, 2011
  5. OLIVE2222

    OLIVE2222

    690
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    Oct 2, 2011
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