Alternative to nickel then gold for wire bond

[MooseFET]

I have a situation where I want to do a wire bond onto a copper trace
on FR4. Direct bonding to copper isn't as reliable as a bond to
nickel gold. What are my other options?

I want a nonmagnetic noncorroding surface on all of the traces and to
wire bond in one place and solder in another.

 

[Spehro Pefhany]

I have a situation where I want to do a wire bond onto a copper trace
on FR4. Direct bonding to copper isn't as reliable as a bond to
nickel gold. What are my other options?

I want a nonmagnetic noncorroding surface on all of the traces and to
wire bond in one place and solder in another.

This might be of interest:
http://imperia.mi-verlag.de/imperia/md/upload/product/orthodynelargediameterwirebonding.pdf

 

[MooseFET]

This might be of interest:http://imperia.mi-verlag.de/imperia/md/upload/product/orthodynelarged...

Interesting but not really what I need in this case.

I like the idea of doing direct chip on board as a way to push down
the size on power things but not have to spend huge amounts on the NRE.

 

[linnix]

Interesting but not really what I need in this case.

I like the idea of doing direct chip on board as a way to push down
the size on power things but not have to spend huge amounts on the NRE.

Gold plated FR4 is not that much more expensive. What NRE?

 

[James Arthur]

I have a situation where I want to do a wire bond onto a copper trace
on FR4. Direct bonding to copper isn't as reliable as a bond to
nickel gold. What are my other options?

I want a nonmagnetic noncorroding surface on all of the traces and to
wire bond in one place and solder in another.

There *is* a solution to this requirement--I know someone who's
done it, reliably. Alas, I don't remember what he did, or if
it's proprietary.

Maybe Google chip-on-board stuff?

James Arthur

 

[MooseFET]

Gold plated FR4 is not that much more expensive.  What NRE?

The gold plating was not the case that would cost the large NRE. In my
original post, I was asking about something that has nothing to do
with this comment about the link provided.

The nickel is the problem I am trying to solve right now.

 

[MooseFET]

There *is* a solution to this requirement--I know someone who's
done it, reliably.  Alas, I don't remember what he did, or if
it's proprietary.

Maybe Google chip-on-board stuff?

I have googled on that and other things and have found lots of sites
with various alternatives. Going directly down on the copper looks
like a poor option. Silver with magic organic compound looks ok. I
was hoping for a great success story from one of the members of the
group.