I got an advice from IXYS's support. They recommend quite another solder for
their large power MOSFET 's :
92.5Pb/5Sn/2.5Ag. Has anyone of you used it?
Will increase the peak temperature from our today's +300C to +400C.
They ought to know. But that will melt the sealframe of the package,
because it's soldered with AuSn.
/Inge
----- Original Message -----
From: "Inge" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, October 09, 2008 10:41 AM
Subject: Re: [TN] Need soldering advice ASAP No II
> Thanks for the support of the linearing idea. I had a feeling that this
> could help.
> You make me think of placeing the connector on the boards before HASL.
> Hmmm...what will happen in the wave soldering of the boards later?
>
> You started the machinery in my old, gaggy brain....what about applying a
> solder mask right over? Is it realistic with that fine pitch? Will the
> solder ignore the solder mask and bridge?
>
> /Inge
>
>
> ----- Original Message -----
> From: "Thayer, Wayne" <[log in to unmask]>
> To: "TechNet E-Mail Forum" <[log in to unmask]>; "Inge"
> <[log in to unmask]>
> Sent: Thursday, October 09, 2008 10:19 AM
> Subject: RE: [TN] Need soldering advice ASAP No II
>
>
> Killing the protrusion should linearly improve the process. If you have
> cut them to negligible protrusion and still have trouble, then you are
> stuck with flux/temperature/time games, or some kind of hot air blow-off
> like out of the HASL machine.
>
> Wayne
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
> Sent: Thursday, October 09, 2008 12:31 PM
> To: [log in to unmask]
> Subject: Re: [TN] Need soldering advice ASAP No II
>
> Also need advice concerning soldering of a 120 pin, three row, right
> angle, through hole edge connector. The pitch is 1 mm, and the through
> hole copper collar is such, that the space between them is just a
> fraction of a millimeter. We tried to use our selective soldering
> machine, but whatever we do, the SnPb overbridges all the pins! I'm not
> surprised, because the solder surface tension will not allow the solder
> to withdraw pin by pin.
> However, such connectors are made and sold plenty of, so they must be
> solderable, question is with what. The selective soldering machine's
> 'wave pot' is 10 mm across and the minimum wave top is 3 mm. Does it
> help to cut the pins so that they are even with the board ? Today, the
> pins protrude
> 0.3 mms . Anyone who knows nothing?
> /Inge
> PS. Will send a photo to Dr Gregory.
>
> ---------------------------------------------------
> 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
> -----------------------------------------------------
>
> This e-mail and any files transmitted with it may be proprietary and are
> intended solely for the use of the individual or entity to whom they are
> addressed. If you have received this e-mail in error please notify the
> sender.
> Please note that any views or opinions presented in this e-mail are solely
> those of the author and do not necessarily represent those of ITT
> Corporation. The recipient should check this e-mail and any attachments
> for the presence of viruses. ITT accepts no liability for any damage
> caused by any virus transmitted by this e-mail.
>
> ---------------------------------------------------
> 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
-----------------------------------------------------
|
