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March 2010

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Subject:
From:
Guy Ramsey <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Guy Ramsey <[log in to unmask]>
Date:
Tue, 23 Mar 2010 07:37:12 -0400
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text/plain
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text/plain (95 lines)
I would be treating it as a high temp BGA or CGA. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Nowland, Russell Howard
(Russell)
Sent: Monday, March 22, 2010 3:57 PM
To: [log in to unmask]
Subject: [TN] TI/Emerson SMT Board Mounted Power

Hello Technetters,

I have a problem I hope someone out there has a solution for.

I have on a PCA that uses a Texas Instrument/(Emerson Power/Artesyn) (dual
sourced but part of the POLA) SMT board mounted power converter.  The MPN is
PTH03050WAS.  It is actually combination PTH and SMT.  The device has 40 mil
diameter pins for PTH and to make it SMT they simply add a donut (solder
dam) on the pin and round the edges and call it a solder ball.  I think the
problem my EMS is having is really with pick-n-place because the pick-up
point (Actually the top of a transformer) is off-center, fairly small, and
it has a plastic label on it.

The problem is the device is coming out of the oven skewed and violating IPC
610D.  The pad diameter is exactly what is recommended by the datasheet
(.085-inches).  The TI datasheet recommended a 0.080-0.085 diameter aperture
@ six mils.  Originally my EMS had 0.085-inch @ 5 mils but changed the
aperture to a bull's-eye shape with the thought the bull's-eye would help
center the device.  Both of the stencils have failed to draw the device to
the center.

Because this is really a Butt Joint I am holding the EMS to no side
overhang.  This is causing them quite a headache. They have also not come up
with a viable solution either.

Here is the link to the data sheet

http://www.emerson.com/sites/network_power/en-US/Products/Product_Detail/Pro
duct1/Documents/PTH03050%20DC-DC%20Converter/PTH03050%20Data%20Sheet.pdf



Has anybody used these devices with good results?  If so can you share your
methodology?

Thanks in advanced,


Russell Nowland
Alcatel-Lucent
Advanced Manufacturing Engineer
Address: 14000 Quail Spring Parkway, Suite 300
Oklahoma City, OK 73134
email:
[log in to unmask]<mailto:[log in to unmask]
>
Desk: 405-302-1660
Cell: 405-203-0034
Fax: 405-302-1622


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