TECHNET Archives

April 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:
Paymon Sani <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Paymon Sani <[log in to unmask]>
Date:
Tue, 3 Apr 2007 11:18:18 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (117 lines)
Great, thank you for sharing your advice. I have seen the application of
the dessipak and Moisture Indicator card from some of the local
suppliers.

Paymon

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: April 3, 2007 11:06 AM
To: [log in to unmask]
Subject: Re: [TN] ENIG PCB Shelf Life

You should ask for the boards to be hermetically sealed to prevent as
much moisture absorption as possible (from humidity). Ideally, a small
dessipak can be included, along with a Moisture Indicator card, just as
if the boards were an MSD. ENIG does not need to be protected from a
surface finish standpoint, as the gold oxidizes very little over time.
The humidity ideally should be kept at less than 30% RH, but that is
only a recommendation. ENIG solderability will remain good for at least
a year on the shelf. The reason you are drypacking the boards is to
prevent as much moisture absorption as possible. ENIG is also not
affected by prebaking as much as other finishes. Solder coupons should
be stored under the same conditions, so they can be tested for
solderability as a representative sample. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paymon Sani
Sent: Tuesday, April 03, 2007 9:18 AM
To: [log in to unmask]
Subject: [TN] ENIG PCB Shelf Life

Hello All,

 

What is the expected shelf life for PCBs with ENIG finish? IPC-4552,
Table 3-1 suggests the PCBs to meet solderability requirements of
category 3 durability with six months shelf life. I would appreciate
your response to the following questions:

1-       How should the PCBs be handled during this time period?

2-       What should be the temperature swing?

3-       What should be the humidity range?

4-       What if the PCBs are older than 6 months and cost a lot of $?
How could we justify to use them?

 

 

Thank you in advance,

Paymon


------------------------------------------------------------------------
---------------
Confidentiality Notice

This e-mail and any attachment(s) are intended for the individual or
entity to which this email is addressed and may contain information that
is confidential.  If you are not the intended recipient or an employee
or agent responsible for delivering this e-mail to the intended
recipient, please be aware that any dissemination, distribution or
copying of this communication is strictly prohibited.  If you have
received this in error, please notify the sender by telephone at
604.430.4336 or by return e-mail, and please delete or destroy all
copies of this communication.  Thank you!

---------------------------------------------------
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
-----------------------------------------------------

---------------------------------------------------
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
-----------------------------------------------------

---------------------------------------------------------------------------------------
Confidentiality Notice

This e-mail and any attachment(s) are intended for the individual or entity to which this email is addressed and may contain information that is confidential.  If you are not the intended recipient or an employee or agent responsible for delivering this e-mail to the intended recipient, please be aware that any dissemination, distribution or copying of this communication is strictly prohibited.  If you have received this in error, please notify the sender by telephone at 604.430.4336 or by return e-mail, and please delete or destroy all copies of this communication.  Thank you!

---------------------------------------------------
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
-----------------------------------------------------

ATOM RSS1 RSS2