My rule of thumb for 68 pin PLCC sockets

Don't exceed 24Mhz & replace the IC in the socket no more than 4 times.
Passing analog signals through the socket is a no-no...

When using 48Mhz, do not replace the IC more than 2 times.

These are my personal rule and they do not conform to any standards out there.


____________
Brian Guralnick


----- Original Message ----- 
From: "Lloyd Johnson" <[EMAIL PROTECTED]>
To: "Protel EDA Forum" <[EMAIL PROTECTED]>
Sent: Friday, April 19, 2002 9:15 PM
Subject: [PEDA] PLCC Socket reliability


| This may be slightly off topic, but we are beginning to have occasional
| problems with the reliability of the connections between a 68 pin low
| profile PLCC socket and a 68 pin IC package.
| 
| Are low profile sockets (Millmax 540-99-068-17-400200) less reliable than
| full height PLCC sockets? Or are PLCC sockets for larger parts just
| inherently a bad idea?
| 
| This socket uses the same footprint as the PLCC part, so we can change to
| direct soldering the part in place if this is needed.
| 
| Any thoughts would be appreciated.
| 
| Lloyd Johnson, DSS
| Vista CA.
| 
| 

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