LEADFREE Archives

April 2005

Leadfree@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:
Vladimir Igoshev <[log in to unmask]>
Reply To:
(Leadfree Electronics Assembly Forum)
Date:
Fri, 29 Apr 2005 11:10:07 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (199 lines)
That seems like a lot of solder on the leads already, I usually see a few microns. It makes me think even more that the substrate has nothing to do with it. Did you run any of the sodlerability tests? Good think would be to look at the virgin and failed parts with an SEM/EDS from the surface and in the X-section.

Regards,

Vladimir

Vladimir Igoshev, Ph. D.
Senior Materials Researcher
Research in Motion
451 Phillip St.
Waterloo, ON, N2L 3X2

Voice: (+1) 519-888-7465, ext. 5283
Fax: (+1) 519-886-0863
E-mail: [log in to unmask]


-----Original Message-----
From: Leadfree [mailto:[log in to unmask]]On Behalf Of Qing Gu
Sent: Friday, April 29, 2005 11:03 AM
To: [log in to unmask]
Subject: Re: [LF] Does Ni barrier help soldering?


85Sn15Pb, 12~20um thickness, 25mil pitch QFP, and it seems thicker finish
better than thin.

Qing

> Well, as I've said, I wouldn't think so right away. Do you have more
> information on your component finish/terminals?
>
> Regards,
>
> Vladimir
>
> Vladimir Igoshev, Ph. D.
> Senior Materials Researcher
> Research in Motion
> 451 Phillip St.
> Waterloo, ON, N2L 3X2
>
> Voice: (+1) 519-888-7465, ext. 5283
> Fax: (+1) 519-886-0863
> E-mail: [log in to unmask]
>
>
> -----Original Message-----
> From: Leadfree [mailto:[log in to unmask]]On Behalf Of Qing Gu
> Sent: Friday, April 29, 2005 10:54 AM
> To: [log in to unmask]
> Subject: Re: [LF] Does Ni barrier help soldering?
>
>
> We do think that the soldering problem must be related to the high tin
> finish. But some body told me that from the experience, parts with Ni
> barrier get better chance to solder, and that's why I have this question
> in mind.
>
> Qing
>
>> I think there is a good chance that your current substrate material has
>> nothing to do with the problem, so changing it (adding a Ni barrier)
>> won't
>> solve the problem. How do you know that it's not the Sn-rich plating
>> itself that is causing the problem?
>>
>> Regards,
>>
>> Vladimir
>>
>> Vladimir Igoshev, Ph. D.
>> Senior Materials Researcher
>> Research in Motion
>> 451 Phillip St.
>> Waterloo, ON, N2L 3X2
>>
>> Voice: (+1) 519-888-7465, ext. 5283
>> Fax: (+1) 519-886-0863
>> E-mail: [log in to unmask]
>>
>>
>> -----Original Message-----
>> From: Leadfree [mailto:[log in to unmask]]On Behalf Of Qing Gu
>> Sent: Friday, April 29, 2005 10:32 AM
>> To: [log in to unmask]
>> Subject: [LF] Does Ni barrier help soldering?
>>
>>
>> Hi All,
>>
>> We are soldering component with hign tin (above 85%)finish using
>> eutectic
>> solder and having soldering problems such as Non-wetting. If we use
>> component with Ni barrier, will the Ni barrier help soldering? If so,
>> why?
>>
>> Thank you.
>>
>> Qing Gu
>>
>> -------------------------------------------------------------------------------Leadfee
>> Mail List provided as a 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 Leadfree
>> To temporarily stop/(start) delivery of Leadree for vacation breaks
>> send:
>> SET Leadfree NOMAIL/(MAIL)
>> Search previous postings 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
>> -------------------------------------------------------------------------------
>>
>>
>>
>> ---------------------------------------------------------------------
>> This transmission (including any attachments) may contain confidential
>> information, privileged material (including material protected by the
>> solicitor-client or other applicable privileges), or constitute
>> non-public
>> information. Any use of this information by anyone other than the
>> intended
>> recipient is prohibited. If you have received this transmission in
>> error,
>> please immediately reply to the sender and delete this information from
>> your system. Use, dissemination, distribution, or reproduction of this
>> transmission by unintended recipients is not authorized and may be
>> unlawful.
>>
>> -------------------------------------------------------------------------------Leadfee
>> Mail List provided as a 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 Leadfree
>> To temporarily stop/(start) delivery of Leadree for vacation breaks
>> send:
>> SET Leadfree NOMAIL/(MAIL)
>> Search previous postings 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
>> -------------------------------------------------------------------------------
>>
>>
>
> -------------------------------------------------------------------------------Leadfee
> Mail List provided as a 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 Leadfree
> To temporarily stop/(start) delivery of Leadree for vacation breaks send:
> SET Leadfree NOMAIL/(MAIL)
> Search previous postings 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
> -------------------------------------------------------------------------------
>
>
>
> ---------------------------------------------------------------------
> This transmission (including any attachments) may contain confidential
> information, privileged material (including material protected by the
> solicitor-client or other applicable privileges), or constitute non-public
> information. Any use of this information by anyone other than the intended
> recipient is prohibited. If you have received this transmission in error,
> please immediately reply to the sender and delete this information from
> your system. Use, dissemination, distribution, or reproduction of this
> transmission by unintended recipients is not authorized and may be
> unlawful.
>
>

-------------------------------------------------------------------------------Leadfee Mail List provided as a 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 Leadfree
To temporarily stop/(start) delivery of Leadree for vacation breaks send: SET Leadfree NOMAIL/(MAIL)
Search previous postings 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
-------------------------------------------------------------------------------



---------------------------------------------------------------------
This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful.

-------------------------------------------------------------------------------Leadfee Mail List provided as a 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 Leadfree
To temporarily stop/(start) delivery of Leadree for vacation breaks send: SET Leadfree NOMAIL/(MAIL)
Search previous postings 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