Tom,

HASL is not recommended for fine pitch parts. The surface variability causes
assembly problems. Ask your PCB Designer to look into one of the alternative
surface finishes, Gold Immersion, White Tin, or OSP.

Bill Brooks
PCB Design Engineer , C.I.D., C.I.I.
TITAN SYSTEMS CORPORATION
DATRON WORLD COMMUNICATIONS DIVISION
3030 Enterprise Court
Vista, CA 92083
Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510
mailto:[log in to unmask] <http://www.dtwc.com/>




-----Original Message-----
From: Tom Parkinson - Quality System Manager - WinTronics, Inc.
[mailto:[log in to unmask]]
Sent: Monday, September 23, 2002 12:42 PM
To: [log in to unmask]
Subject: [TN] HASL


Hello all,

Have been looking for some kind of spec for HASL thickness and uniformity.
Having problems with small to fine pitch parts where HASL is causing
problems.

Only reference I can find so far is in 2221 where it says HASL is checked
not by mechanical thickness, but by the ability to solder per JSTD003. 003
only talks about being able to solder - not about variability of HASL
causing problems.

My SMT people are giving me a hassle about the HASL......

Any suggestions??

----------------------------------------------------------------------------
-----
Technet Mail List provided as a free 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/html/forum.htm for additional information, or
contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
----------------------------------------------------------------------------
-----

---------------------------------------------------------------------------------
Technet Mail List provided as a free 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/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------