Jonathan,

Most times when using the Pb95Sn5 alloy I would use a reducing atmosphere
for 'fluxing', at the very least using a nitrogen [<10 ppm Oxygen]
atmosphere.  This would allow you to reduce the amount of flux required or
change flux types.

By all means check in with Heraeus.  Where are you located?

Steve C

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of jonathan noquil
Sent: Monday, February 08, 2010 12:47 AM
To: [log in to unmask]
Subject: [TN] Flux Cleaning

Hi All
What is the best flux cleaning agent that can effectively remove flux on
ENiAu bond pads?
We solder a copper strap on the silicon with PbSn5 at 350 degc temperature,
the flux contaminates the bonding pads.
Paste is from Heraues. We used an ultrasonic cleaning equipment.
During Au wirebonding, we have lots of bond off occurences? We tried to do
FTIR on the surface and found some traces of that resin contamination.

Is the flux difficult to remove with flux cleaning agent when it was
reflowed at high temperature?


Thanks


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