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February 2010

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Subject:
From:
Werner Engelmaier <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Werner Engelmaier <[log in to unmask]>
Date:
Mon, 15 Feb 2010 18:29:49 -0500
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 Hi Carl,
Go with 1), forget 4)

Werner

 


 

 

-----Original Message-----
From: Carl Ray <[log in to unmask]>
To: [log in to unmask]
Sent: Mon, Feb 15, 2010 5:49 pm
Subject: [TN] Pre-Tinned BGA?


Hello All,
 I had a question to see if anyone has tried anything different. Most of our 
customers are some how related to the military. So we have one product that the 
customer just found out was a PB-Free device. They want us to "pre-tin" the 
spheres. Now I have tried several process for forward and backward processes. 
None of them include re-tinning of a BGA Device. We do re-tin other leaded and 
some non leaded devices. So below are the three options I have recommended but 
still have reliability concerns as the end product is to be coated with 
Paralyne.
1. Re- Ball to PB/SN
2. Sue a selective rework machine and place pate with isolated heat if the 
substraight could handle.
3. Purchase the component in PB/SN material
4. Reflow the product with slightly higher temps (5c per 10 zones) once out of 
over and cold to room temp underfil the device.

Again if anyone has any more ideas I am game!!


Carl Ray
Lewisburg TN 37091

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