We have one customer that has more than one assembly with TSOPS utilizing alloy 42 (TI parts I believe). For these assemblies I run my Peak relow temps higher than I normally do (220-230 C.) with good results.
Royce
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Royce Taylor
Process Engineering/Production
Suntron Corporation NEO
104 Glenn Street
Lawrence, MA 01843
(978)747-2061 voice
(978)747-2010 fax
[log in to unmask]
-----Original Message-----
From: Bev Christian [mailto:[log in to unmask]]
Sent: Thursday, March 18, 2004 8:25 AM
To: [log in to unmask]
Subject: Re: [TN] TSOPs
Edwin,
Good for you for using the archives! Short answer: yes, rejected!
Bev Christian
Research in Motion
-----Original Message-----
From: Edwin Louis [mailto:[log in to unmask]]
Sent: March 18, 2004 8:21 AM
To: [log in to unmask]
Subject: Re: [TN] TSOPs
I notice in the IPC Archives that all of the questions and comments about
alloy 42 were in the
~1994-1995 time period. Has the general population out there totally
rejected TSOPS
with alloy 42 leads? No comments or questions appear from 2001 to present.
-----Original Message-----
From: Werner Engelmaier [mailto:[log in to unmask]]
Sent: Tuesday, March 16, 2004 6:43 AM
To: [log in to unmask]
Subject: Re: [TN] TSOPs
Hi Edwin,
>Are there any specifications ,standards or articles on soldering TSOPs
>especially ones with Alloy42 leads?
There are some papers:
Engelmaier, W., "Alloy 42--Not a Choice Material for Surface Mount Leads,"
35th Annual IPC Meeting, Bal Harbour, FL, April 1992.
Engelmaier, W., and B. Fuentes, "Alloy 42: A Material to be Avoided for
Surface Mount Solder Component Leads and Lead Frames," Proc. Surface Mount
International Conf., San Jose, CA, August-September 1994, pp. 644-655; also
in Proc.
Int. Electronics Packaging Conf. (IEPS), Atlanta, September 1994, pp.
503-516;
also in Proc. 19th Ann. Electronics Manufacturing Sem., Naval Air Warfare
Center, China Lake, CA, February 1995, pp. 5-20; also in Proc. NEPCON West
‘95,
Anaheim, CA, February-March 1995, pp. 385-395; also in Soldering & Surface
Mount
Technology, No. 21, October 1995, pp. 20-25.
Regards,
Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL 32174 USA
Phone: 386-437-8747, Fax: 386-437-8737
E-mail: [log in to unmask], Website: www.engelmaier.com
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