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ECE Projects Lab

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ECE Projects Lab

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    1. ECE Projects Lab Surface Mount Technology Kip Coonley - kcoonley@ee.duke.edu Willie Du – w.du@duke.edu

    2. What is SMT? Surface Mount Technology Used primarily in industry Same circuitry with much smaller components Was not intended for individual soldering, but gaining popularity SMT has been around in industry since the late 80’s. After the prevalent use of dip chips on SMT has been around in industry since the late 80’s. After the prevalent use of dip chips on

    3. SMT Components Resistors 555 IC

    4. SMT Board

    5. Why SMT (advantages)? Much smaller size Components on both sides of board Leads can be much shorter reducing inductance and resistance there by increasing performance Prototyping is more indicative of the final product

    6. How to SMT (techniques) Fine tip soldering Uses conventional soldering techniques on a much smaller scale Hot air reflow Uses soldering paste and hot air to reflow the soldering paste with components preset Oven reflow Uses soldering paste and reflows entire board

    7. Fine Tip Soldering Conventional equipment Causes eye strain Requires a steady hand

    8. Hot air reflow Hot-Air Rework Station AM6500 by JBC Fine tip solder tools Desoldering tools Hot tweezers Hot air gun

    9. How hot air reflow works Hot air used to desolder IC Vacuum extractor pulls IC after solder flows

    10. Oven reflow Typical Reflow oven Large and bulky Expensive $$$ ? Cuisinart TOB 165 Just as good A small fraction of the cost

    11. Oven Reflow Overview After applying solder paste and setting components, the board is inserted to be “cooked” End result is a perfectly soldered board for a fraction of the cost (no eye strain either)

    12. Reflow Caution The temperature of the reflow process must be precise enough as to not damage the IC’s through excess heat and sufficient for reflow of the solder.

    13. Oven Reflow Steps Apply soldering paste Set IC’s and components Cook! Touch up using soldering wick to remove excess solder

    14. Toaster Oven Reflow Steps

    15. Movie time Silicon runs II

    16. Summary Fine tip soldering is hard, but essential sometimes Hot air reflow is more convenient for reworking of components Oven reflow is great for creating a whole board at once ECE Projects Lab will do it all.

    17. Credits/Work cited http://en.wikipedia.org/wiki/Surface-mount_technology General SMT info http://www.heinc.com/jbc/repair.html Hot air reflow station website http://www.bidservice.com/Browses/NF_Detailed_Item_View_new.asp?ProductID=20069 Place to purchase typical reflow oven http://www.seattlerobotics.org/encoder/200006/oven_art.htm Another group that has done a similar project with a toaster oven http://www.circuitcellar.com/library/print/0704/Lacoste_168/ Thermal profile for a toaster oven

    18. Laboratory Hours Monday: 11:15AM-1:45PM Tuesday: none Wednesday: 11:15AM-1:45PM Thursday: 6:00PM-8:00PM Friday: 11:15AM-1:45PM For other times please contact Kip Coonley at kcoonley@ee.duke.edu

    19. Design Lab Website Presentations available Online Reflow Tutorial http://www.ee.duke.edu/DesignLab/ Useful Contact Info: Me: w.du@duke.edu Kip: kcoonley@ee.duke.edu

    20. The End

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