Hi Paul,
No, lead shape is not totally arbitrary, since the lead cross-section,
together with its length and material properties determine the lead stiffness. The
lead stiffness is important in determining the reliability of the solder joints
(see IPC-D-279). Thus, QFP solder joints are more reliable than TSOP solder
joints.
Werner
**************
It's Tax Time! Get tips, forms, and advice on AOL Money &
Finance.
(http://money.aol.com/tax?NCID=aolprf00030000000001)
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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
-----------------------------------------------------