Inge,

What size LGA's are you using?

We're considering using them in a similar application. Are they Tin Lead
(SnPb) or Lead Free (SAC-305)?

Lee Whiteman, PMP
Senior Member Engineering Staff
L-3 Communications East
Telephone: (856) 338-3508
FAX: (856) 338-2906
E-Mail: [log in to unmask]
 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
Sent: Friday, April 24, 2009 12:50 PM
To: [log in to unmask]
Subject: Re: [TN] LGAs in a military environment?

Hi Graham,

we are ambivalent as to LGAs and are therefore  testing just now. We
have 
passed 10,000 cycles -40/+60 Celsius and got some indications from the
daisy 
chains that there is something going on.Sonoscan shows some interrupts
but 
we have not found out where yet. This very day I got a emergency call
from a 
guy about LGAs. I don't have many details yet, but the issue is scaring:
the 
LGAs have pushpulled so violently in the copper traces, that the copper
has 
lifted from the board!! I'll be back with more details next week This
was a 
MIL microwave board and the LGAs had just some 20 I/Os.  Why he used
them? 
Because they are superior in all means to BGAs at 30-100 GHz.

Inge



----- Original Message ----- 
From: "Graham Collins" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, April 16, 2009 12:32 PM
Subject: [TN] LGAs in a military environment?


Hello Technet!
One of our designers is advocating using a LGA component in a military
product.  Anyone out there doing it?  I'm wondering (worried) about the
reliability since it has a very low standoff.  And cleaning issues?

An example of the parts I'm referring to:
http://www.linear.com/designtools/packaging/lga/05081807_a_lga66.pdf
A Linear Technologies p/n LTM4604

regards,

Graham Collins
Halifax Production Engineering
(902) 873-2000 ext. 6215


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