TECHNET Archives

February 1999

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:
Phil Crepeau <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 1 Feb 1999 07:41:47 -0800
Content-Type:
text/plain
Parts/Attachments:
text/plain (97 lines)
hi,

this may be true, but it 'volume' that is deposited and not weight.  the
specific gravity of palladium is 12; the specific gravity of gold is 19.3.
so for equal thicknesses of deposit, palladium is the better deal.

phil

-----Original Message-----
From: Eric Yakobson [mailto:[log in to unmask]]
Sent: Friday, January 29, 1999 10:57 AM
To: [log in to unmask]
Subject: Re: [TN] Palladium underplate for Cu-Ni-Au system


Hi Benny,

The irony is that these days palladium is more expensive then gold.  In
today's paper the prices are:
Gold -- $283.30 troy oz.
Palladium -- $331.75 troy oz. (almost as bad as Platinum -- $344.10).

Eric Yakobson
Alpha PC Fab





"Au Po Lam Benny" <[log in to unmask]> on 01/28/99 11:13:50 PM

To:   [log in to unmask]
cc:    (bcc: Eric Yakobson/AlphaPCFabUS/Cookson)
Subject:  [TN] Palladium underplate for Cu-Ni-Au system




Hi technetters,

Does anybody know the purpose of a palladium layer between the Ni and Au
for
wire bonding PCB? Recently, I've got a request to bond gold wire
(thermosonic) on PI flex which is plated with electroless Ni and immersion
Au. On one sample, the gold thickness is reduced and compensated by a
electroless palladium layer above Ni; while the other just is the normal
electroless Ni and immersion Au. The phosphorus contect is around 6-8%.

I would appreciate if anyone can advise me on the palladium function, cost
implication (cheaper by reducing the gold?), and bondability of this kind
of
metalization.

Regards, Benny.
ASM Assembly Automation
Email :[log in to unmask]

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following
text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section
for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or
847-509-9700 ext.312
################################################################

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following
text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section
for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or
847-509-9700 ext.312
################################################################

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet 
################################################################
Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################


ATOM RSS1 RSS2