Hi Marki,

I don't think that anyone has answered your question yet, so here it is :

The proper bake conditions, along with other handling guidelines for
moisture-sensitive devices are all documented in J-STD-033, a joint
IPC/JEDEC standard. The standard does not address vaccum bake but it
includes a table for simple temprature bake cycles at 40C for components in
reels and 125C for components in trays. The actual duration varies based on
the MS level of the component and its body thickness.

The default bake cycle for components in reels is 68 days at 40C. (yes 68
days as in two months). Most assemblers cannot live with this kind of cycle
time so the solution is to remove all components from the reel, bake them at
125C and then re-tape them or use them in JEDEC trays. The default cycle
time at 125C is 48 hours. I am aware that some people use a combination of
vaccum and temperature to reduce the bake duration and I can provide you
with some technical articles and oven suppliers if you are interested.

Regards,

Francois Monette
Cogiscan Inc.
Tel : 450-534-2644
Fax : 450-534-0092
[log in to unmask]
www.cogiscan.com


Date:    Tue, 18 Jun 2002 09:37:43 +0200
From:    Marki Sasportas <[log in to unmask]>
Subject: Moisture sensitive device

 Hi Technos,

Can someone tell me at what conditions  (Vacuum&Temperture) should I dry
those components which are
packed in reel.

 Thanks in advance,
Marki Sasportas.

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL
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
---------------------------------------------------------------------------------