We have done quite a bit of work to qualify LGAs and QFNs, but the
nature of the package is such that it does not lend itself to high
reliability designs.
However, Analog Technologies Corporation has a proprietary process for
performing compliant pin attachment using a laser attachment process.
This allows compliant pins to be added to the LGA package without
heating the component body, and later it can be attached to the PWB
using conventional reflow, increasing the reliability out past 10,000
cycles.
www.analog-tech.com
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of kwood716
Sent: Thursday, April 16, 2009 8:40 AM
To: [log in to unmask]
Subject: Re: [TN] LGAs in a military environment?
Gregg,
What were the failures? I'm interested because I see LGA usage picking
up
steam here.
Ken
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Temkin, Gregg
Sent: Thursday, April 16, 2009 9:22 AM
To: [log in to unmask]
Subject: Re: [TN] LGAs in a military environment?
We just designed out similar LGAs made by Linear when a reliability
analysis
showed VERY EARLY failures probabilities for our typical operation cycle
over a 20 year life.
You can certainly get them soldered and have them pass a screen but that
may
not be the whole picture. Depends on your operating environment/life
requirements. Suggest having someone who is good at analysis run the
numbers.
Gregg
-----Original Message-----
From: Graham Collins [mailto:[log in to unmask]]
Sent: Thursday, April 16, 2009 3:32 AM
To: [log in to unmask]
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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