mike, please provide lead pitch and material of the leads. In addition,
could you provide the carrier of the PLCC (tube or tray?). Are you get them
from MFG or from the distributor? Any pre-screen or program required for
these devices?
jk
At 03:37 PM 7/26/00 -0400, you wrote:
>>>> [log in to unmask] 07/26/00 02:57PM >>>
>
>Mike,
>
>I'm just a summer intern but I have all my books and references here with
>me. Could you give me your question again??
>
>Thanks
>
>-Gary
>
>>>>>>>>>>>>>>>>>>>>>>
>
>Sure, no problem...
>
>We are experiencing problems with soldering of PLCC's.
>
>We find that a significant number of these devices are received from the
vendor with non-coplanar leads. The lack of co-planarity causes open solder
joints.
>
>Investigation has resulted in the knowledge that approximately 5% of the
PLCC device we receive are not within the 0.004" co-planarity requirement.
We find some to be out as far as 0.012". I cannot currently define the
point at which the lack of co-planarity becomes an issue.
>
>The supplier is a major manufacturer of these devices. The parts are on
tape and reel. We have inspected them prior to any processing at our
facility, so we know that it is not a question of in-house handling,
placement, etc.
>
>1) Does anyone else see co-planarity problems with PLCC's?
>
>2) What steps have you successfully taken to correct this problem, and what
was the result?
>
>3) Are there pieces of equipment I can put inline to screen <*gasp*> out
these devices?
>
>4) Any assembly or processing tricks you have used successfully to compensate?
>
>
>
>
>Thanks,
>
>Lang
>x5046
>
>
>>>> [log in to unmask] 07/26/00 02:57PM >>>
>
>Mike,
>
>I'm just a summer intern but I have all my books and references here with
>me. Could you give me your question again??
>
>Thanks
>
>-Gary
>
>
>
>-----Original Message-----
>From: Mike Lang [mailto:[log in to unmask]]
>Sent: Wednesday, July 26, 2000 2:43 PM
>To: [log in to unmask]
>Subject: [TN] PLCC Coplanarity... (or lack of)
>
>
>I got very little response to my coplanarity post, which leads me to believe
>that either no one else is having the problem, or no one else is using
>PLCC's, or...
>
>Is anyone out there using PLCC's without the coplanarity problems?
>
>
>
>
>Thanks,
>
>Lang
>x5046
>
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