Hi Keach, I 'm LW Foo
Currently work on Lead free solder "spheres" , would it standard apply to
solder spheres?
Currently what I 'm working on is SnAgCu alloy, would appreciated pls
advise..
Thanks & Regards

L.W.Foo
Engineer - Advanced Technology
Foo Loke Whong
Carsem Semiconductor Sdn Bhd
Email id : [log in to unmask]
Phone : +(6 05) 5262333       Ext : 530
Fax : +(6 05) 5265333



> ----------
> From:         Keach Sasamori[SMTP:[log in to unmask]]
> Reply To:     Leadfree Electronics Assembly E-Mail Forum.;Keach Sasamori
> Sent:         Wednesday, May 30, 2001 10:13 PM
> To:   [log in to unmask]
> Subject:      [LF] Lead-free tolerances
>
> Posting for Kay Nimmo:
>
> From: "Kay Nimmo" <[log in to unmask]>
> To: "Leadfree Electronics Assembly E-Mail Forum." <[log in to unmask]>
>
> The ISO 9453 standard defines specific composition ranges for each alloy
> rather than general tolerances; e.g.=20
>
> Sn-5Sb can have 4.5 to 5.5%Sb
> Sn-4Ag can have 3.5 to 4.0%Ag
> Sn-1Cu can have 0.45 to 0.9%Cu
>
> I imagine these composition ranges were set to limit significant changes
> to liquidus/solidus. Newer lead-free alloys are in the process of being
> added to the standard.=20
>
> Kay Nimmo
>
>
> -----Original Message-----
> From: Lynn Norman [mailto:[log in to unmask]]
> Sent: 29 May 2001 17:03
> To: [log in to unmask]
> Subject: [LF] Lead-free tolerances
>
>
> We're starting our in-house evaluation of lead-free solder.  The
> composition
> we are initially looking at is 95.5Sn-3.8Ag-0.7Cu.  Our current spec for
> SnPb has a +/- tolerance of 0.5% on the composition.  What kind of
> tolerance
> will the lead-frees have?  How much of an effect will the variability
> have
> on solidus/liquidus temperatures?  Just curious as to what others are
> doing.
>
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Leadfee 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
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Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
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