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June 2005

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Subject:
Re: Max reflow temperature/max cycles
From:
David Tremmel <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, David Tremmel <[log in to unmask]>
Date:
Wed, 8 Jun 2005 16:34:12 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (123 lines) 
Genny,

It has been my experience that QFPs are rather sturdy critters compared to
BGAs.  As long as the ramp rate and max temperature are not high, they can
be reflowed multiple times (4 to 7) and still remain functional in the
long-term (used in Class II equipment).

Memory devices (and sometimes certain lots of components) are more sensitive
and do not survive as many reflow cycles.

David

>From: Genny Gibbard <[log in to unmask]>
>Reply-To: TechNet E-Mail Forum <[log in to unmask]>,              Genny
>Gibbard <[log in to unmask]>
>To: [log in to unmask]
>Subject: Re: [TN] Max reflow temperature/max cycles
>Date: Wed, 8 Jun 2005 15:19:15 -0600
>
>Class 2, no BGA's.  Smallest component 0603, smallest lead pitch probably
>.020".  63/36/2 SnPbAg solder.
>
>-----Original Message-----
>From: David Tremmel [mailto:[log in to unmask]]
>Sent: 8-Jun-05 3:15 PM
>To: [log in to unmask]
>Subject: Re: [TN] Max reflow temperature/max cycles
>
>
>Genny,
>
>If it is standard 63/37 solder, the max should be around 205° Celcius to
>ensure a good intermetallic bond.  But I am sure the gurus can explain it
>better.
>
>Regarding the max cycles, it depends on the class of board, the components
>being used.
>
>Are you in a repair or rework environment?
>
>
>David
>
>
>
> >From: Genny Gibbard <[log in to unmask]>
> >Reply-To: TechNet E-Mail Forum <[log in to unmask]>,              Genny
> >Gibbard <[log in to unmask]>
> >To: [log in to unmask]
> >Subject: [TN] Max reflow temperature/max cycles
> >Date: Wed, 8 Jun 2005 15:06:14 -0600
> >
> >Just wondering if there is a rule of thumb most people spec for the max
> >reflow temperature allowed for a SnPb reflow process.  Or an IPC spec
>about
> >this?  Also, what about how many cycles you would allow at the max reflow
> >temperature?
> >
> >Genny
> >
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