TECHNET Archives

January 2007

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Eli Dallal <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Eli Dallal <[log in to unmask]>
Date:
Tue, 30 Jan 2007 17:04:14 +0200
Content-Type:
text/plain
Parts/Attachments:
text/plain (49 lines)
Hi to all, 

I am using a QFN  5 mm square that has 28 leads with a spacing of 0.5 mm
the JEDEC standard MO220K  specifies that the lead width should be
between 

0.18 and 0.3 mm,  however there is a smear or burr on the edge caused by
the cutting and separation of the QFN diminishing the distance between
the leads on the edge  to 0.1 mm. The supplier insists that he can make
the leads 0.3 mm and add to that a tolerance that allows 50% spread
between the leads so 0.1mm is ok for him

 Question have anyone seen such a phenomena ? Is the supplier correct of
his interpretation of the standard .Can this cause shorts ?

 

Eli Dallal

Technologist
Aladdin. Securing the Global Village. 
Hahroshet 10 Kiriat Gat Israel
Tel: +972 3 9781701 ; Fax: +972 8 6600083;
Mobile: 050- 6588 970
Visit us at our Web site! http://www.eAladdin.com
<blocked::http://www.eAladdin.com>  

 

**********************************************************************************************

The contents of this email and any attachments are confidential.
It is intended for the named recipient(s) only.
If you have received this email in error please notify the system manager or  the 
sender immediately and do not disclose the contents to anyone or make copies.
** eSafe scanned this email for viruses, vandals and malicious content **

**********************************************************************************************

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------

ATOM RSS1 RSS2