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Subject:	Re: Unusual Assembly Requirement...
From:	Dwight Mattix <[log in to unmask]>
Reply To:	TechNet E-Mail Forum <[log in to unmask]>, Dwight Mattix <[log in to unmask]>
Date:	Wed, 3 Mar 2010 09:24:45 -0800
Content-Type:	text/plain
Parts/Attachments:	text/plain (233 lines)
At 08:42 AM 3/3/2010, Guy Ramsey wrote:
>We did the board in two reflow cycles.
>Print, place, dispense, place reflow.
>Dispense, place, dispense place reflow.

On PURPOSE?   >:-}

R&D Circuits, Crack dealers to the Semi-conductor ATE designer.



>A three high stack is more common, one reflow.
>
>Just make sure the convection fans are on low, and the parts are very
>solderable to start.
>A tombstone or drawbridge ruins your whole day.
>
>Though the speed is a few Ghz the devise on the opposite side of the board
>is digital.
>
>Remember when we used to think a 10Mhz clock was really fast?
>I had a DELL 286 with 8 to 12.5 Mhz clock that, according to PC Mag, was
>fast enough to burn sand off the desert floor.
>
>Guy
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
>Sent: Wednesday, March 03, 2010 6:09 AM
>To: [log in to unmask]
>Subject: Re: [TN] Unusual Assembly Requirement...
>
>What was the total number of reflows?
>
>Vic,
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
>Sent: Tuesday, March 02, 2010 2:39 PM
>To: [log in to unmask]
>Subject: Re: [TN] Unusual Assembly Requirement...
>
>Hi Jon,
>
>Yes these are individual caps, each layer is a different value. The board
>was screen printed and the bottom layer was machine placed. The next layer
>was done by hand dispensing solder paste on each cap termination, and then
>hand placing the second layer caps. The board was then reflowed. After
>reflow, paste was again hand dispensed on the second layer caps
>terminations, the third layer caps were hand placed, and then solder paste
>was hand dispensed on the third layer caps termination. Finally the fourth
>layer caps were hand placed, and the board sent back through reflow the
>second time.
>
>We needed to do it in two reflow steps otherwise the stacks would have
>toppled over into each other...
>
>Steve
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Roberts, Jon (SA-1)
>Sent: Tuesday, March 02, 2010 3:04 PM
>To: [log in to unmask]
>Subject: Re: [TN] Unusual Assembly Requirement...
>
>Steve, these were all individual caps? We have used double stack caps that
>were manufactured that way. It just looks fragile.  Jon
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
>Sent: Tuesday, March 02, 2010 1:52 PM
>To: [log in to unmask]
>Subject: [TN] Unusual Assembly Requirement...
>
>Hi All,
>
>
>
>I came into work today and saw something that I've not seen before. Keep in
>mind that the area shown is about ½" square, and that these are 0402's...
>
>
>
>http://stevezeva.homestead.com/files/Quad_Stack.JPG
>
>
>
>This was done using two reflows, and the caps were not touched by a
>soldering iron.
>
>
>
>You may ask why. It's because it's what we were asked to do by our customer.
>
>
>
>We have a very talented lady working on the production floor who
>accomplished this.
>
>
>
>Steve
>
>
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