EPROM bonding wires

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solarnevo1

Active member
Joined
Jan 27, 2012
Messages
42
What kind of material is used in eprom for bonding wires? Tested with diluated nitric. Thin wires don't react with nitric? What kind of material can be? Aluminium is reacting with nitric. Platinum maybe?
 
Try a piece of aluminum in nitric and tell us what you found. :wink:

Göran
 
Probably 99+% of all bonding wires are: pure gold, aluminum, or copper. There are a few odd-ball ones out there but they seem to be quite rare.

Of these 3:

The yellow ones are always gold. An inch is worth from 0.5 to 1 cent per inch, depending on whether they are .0007" or .001" in diameter.

The white ones are aluminum. They are worthless.

I've never seen the copper bonding wires, except in pictures.
https://www.google.com/search?q=copper+bonding+wires&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiZl8DugI7UAhVBzoMKHaHkDAYQ_AUICygC&biw=1138&bih=481
 
Aluminum does NOT react with nitric - it does react with HCl

In other words - nitric will not dissolve aluminum - HCl will

The point is - nitric is NOT the go to - test all - acid to determine if a metal is a precious metal (gold or PGM) or a base metal

Kurt
 
Aluminum will react slowly with dilute nitric but it depends on the Al alloy. It doesn't react with strong nitric because an impervious aluminum oxide film forms on the surface of the Al due to the strong oxidizing action of the strong nitric. Al will, of course, react quickly with HCl or muriatic acid.
 
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