Robert,

There are a number of papers on the subject I can share with you.
I'll send them to you directly. As Vladimir says, it's a really bad idea.

Bob Landman
President
H&L Instruments, LLC
LDF Coatings, LLC
PO Box 580
34 Post Road
North Hampton, NH 03862
tel (603) 964-1818
fax (603) 964-8881
www.hlinstruments.com
www.ldfcoatings.com 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Vladimir Igoshev
Sent: Tuesday, September 25, 2012 8:36 PM
To: [log in to unmask]
Subject: Re: [TN] Leaded Paste and Lead Free BGAs - Do they mix?

The balls HAVE TO have enough heat delivered to distribute Pb evenly throughout the joints. As a results they will collapse.
Regards,

Vladimir

SENTEC Testing Laboratory Inc.
11 Canadian Road, Unit 7.
Scarborough, ON M1R 5G1
Tel: (416) 899-1882
Fax: (905) 882-8812
www.sentec.ca

-----Original Message-----
From: Robert Kondner <[log in to unmask]>
Sender: TechNet <[log in to unmask]>
Date: Tue, 25 Sep 2012 20:26:28
To: <[log in to unmask]>
Reply-To: <[log in to unmask]>
Subject: [TN] Leaded Paste and Lead Free BGAs - Do they mix?

Hi,

 

I have a customer using leaded paste with lead free BGAs. I think they want to have the balls NOT collapse for better optical inspection.

 

Sounds like a really bad idea to me but I have no explanation where I can say as why.

 

Can anyone make suggestions either way?

 

Thanks,

Bob K.



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