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March 2014

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Subject:
From:
Wayne Thayer <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Wayne Thayer <[log in to unmask]>
Date:
Mon, 3 Mar 2014 00:17:40 +0000
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Those look like pretty stiff leads.

You may wish to investigate designing an etched leadframe which converts these to horizontal.  I like etched brass sheet--I'd suggest 10mils thick.  You design a nice stencil-like design and have Photofab or some other etching house make a bunch for you.  You could even go to 15 mils thick if necessary and can have them overplated with ImAg so they solder easily.  The sheet should be thick enough to carry say, 10 xfmrs at a time.  You wave solder the joints and then pop the singulates out of the stencil and cut off the stubs--could have a milling machine do that before you pop them out of the stencil if you need even more automation.

Another nice thing about the brass is it can be used for both mechanical and thermal relief if required.

Wayne Thayer

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bob Wettermann
Sent: Friday, February 28, 2014 7:26 PM
To: [log in to unmask]
Subject: [TN] Straightening Txmr Leads

All:

I have a weird one. Here is a link to a picture of a similar TH micro
transformer:

http://2.imimg.com/data2/CV/ID/MY-3829125/ferrite-core-transformers-through-hole-500x500.jpg

Any method/recommended machines outside of manual straightening (there are
20K+ pieces) to straighten the leads?

-- 
Bob Wettermann
BEST Inc


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