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Thread: Peak temperature on BGA balls -reflow proccess

  1. #1
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    Default Peak temperature on BGA balls -reflow proccess

    Hello.

    I have a question about reflow profile of BGA components.

    As I measured the temperature on several places of a BGA component , I found there were differences on temeprature of the case and the balls of the BGA.

    I need to asure good reflow , meaning all the balls get strong metal connection with the pad after reflow, so I want to activate the max temperature on the reflow proccess. on the other hand of course, I definitely on't want to damage the component, so how can I know what min temperature I need to aplly on the balls so they melt the best?

    I saw in all Altera's documents that max temperature of 220 c on case is recommended, but found no refering to balls max temperature, or min temperature above the reflow temp.

    Thank you very much for your answer.

    Mosh_p1

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    Default Re: Peak temperature on BGA balls -reflow proccess

    Try this doc:
    http://www.altera.com/literature/an/an353.pdf

    Your question is answered in "Reflow Process Considerations"

    Basically for ROHS, minimum reflow temp is 235C and maximum is 245C ->260C depending on package size. (217C melting point)

    For non-rohs, it's 200C to 235C for reflow (melting point = 183C)

    Pete

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    Default Re: Peak temperature on BGA balls -reflow proccess

    Thank you.

    You are right, I forgot to mention, that I'm refering to Lead components, not RHOS compliant.

    It is right that reflow Temperature are between 200-235{ most of companies, including Altera recommend on max temp. of 220 C} but since I deal with quite large BGA's , and there is a difference in temperature between it's parts, specialy between case and balls temp. , I want to know what temperature the balls must feel for good melting.

    I'm asking that beacause I'm limmited on the top temp {218 C} of all proccess.

    Thank you!

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