Hi TechNet! Sorry Lenny but the paper you reference doesn't support the
clam that Al wirebond on ImmAu/ENi is acceptable. Table 4 on page 691and
the associated discussion details successful Au wedge bonding on ImmAu/ENi
but not for aluminum. There have been some reports of successful Al
wirebonding on ImmAu/ENi (as soon as I can dig up the reference out of my
files I'll post it on TechNet) but not that specific reference.
Dave Hillman
Rockwell Collins
[log in to unmask]
Lenny Kurup <[log in to unmask]> on 08/11/98 09:20:02 AM
Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond
to Lenny Kurup <[log in to unmask]>
To: [log in to unmask]
cc:
Subject: Re: [TN] Is Al to Ni wirebonding possible
Hello Rusty,
Consult "Wirebondability and solderability of various metallic finishes for
use in printed circuit assembly." by Hillman, Bratin and Pavlov; 1996 IPC
Expo, S.J.
Results have shown peel strengths to be way below IPC wirebondability
requirements, for Al wire on elNi/ImAu. Au wire, however, passes the peel
strength requirement.
Regards,
Lenny Kurup
EMX Enterprises Ltd.
Markham, Ontario, Canada
905-475-8000 Ext 240.
On Tue, 11 Aug 1998, Rusty Boyd wrote:
> Hi,
> A certain vendor claims that thermosonic Al to Ni wirebonding is
possible. I am
> looking for references to refute or support this claim. The precise claim
is
> that on a flexible PCB constructed of:
> Kapton: 25 um
> Cu: 7-8 um
> Ni: 1.0 um
> Au: 0.2 um
> that thermosonic wire bonding with Al wire results in a wire bond to the
Ni
> layer. This claim was made after being confronted with the IPC
recommendation
> that at least 1 um of Au is required.
> If anyone could share his/her experience(s) on this subject, or, better
yet,
> point me toward some authoritative reference(s), I would greatly
appreciate it.
> TIA,
> Rusty
>
>
>
>
>
> Rusty Boyd
> OUHEP - http://oua4.nhn.ou.edu/
> [log in to unmask]
> office: (405)325-2890 x36316
> office fax: (405)325-7557
> home ph., fax and data: (405)447-5211
> University of Oklahoma
> Dept. of Physics and Astronomy
> 440 W. Brooks
> Norman, OK 73019
>
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