Subject: | |
From: | |
Date: | Mon, 27 Jan 1997 07:22:37 EST |
Content-Type: | text/plain |
Parts/Attachments: |
|
|
\0
TO: I4235700 IBMMAIL new address for ipc technet 25.6.96
FROM: DSTEWART EX2 D.Stewart - Product Development Manager.
DATE: 27 January 1997
SUBJECT: Gold wiring bonding
REFERENCE: surface finish requirement
Could someone with experience of ultra/thermo? sonic bonding of
chips to pcbs please offer some help on the finishes that work on
the pcb's pads.
I am particularly interested in gold wire bonding.
It has been suggested in the past that ENAu (5um EN, 0.07um Au) was
ok , but our ENAu supplier is suggesting that this is now only ok
for aluminium wire.
The customer is asking for 5um Nickel, 0.5 - 1um pure (soft) gold,
but is there a compromise?
Dougal Stewart
Exacta Circuits
Scotland
***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To unsubscribe from this list at any time, send a message to: *
* [log in to unmask] with <subject: unsubscribe> and no text. *
***************************************************************************
* If you are having a problem with the IPC TechNet forum please contact *
* Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] *
***************************************************************************
|
|
|