russian diode and question on color test

[ovidiuanghel]

Hello all,

First i have to ask if is any PM in this diodes and second i have tested some scrap before buying, one of the batch has a pink color when tested whit stannous, help me to identify the metal in the solution.



Regards,
Ovidiu

 

[rucito]

2д213а-3.34gr Au per 1000ps.

 

[macfixer01]

2д213а-3.34gr Au per 1000ps.

Seriously? I would be greatly surprised if any diodes contained much of any gold, other than certain glass types which have visible plating on the leads. The junction material would be Silicon or Germanium. There is no need or purpose for such large quantities of gold in them as you suggest. Can anyone corroborate this?

 

[ovidiuanghel]

Seriously? I would be greatly surprised if any diodes contained much of any gold, other than certain glass types which have visible plating on the leads. The junction material would be Silicon or Germanium. There is no need or purpose for such large quantities of gold in them as you suggest. Can anyone corroborate this?

According to (when looking to see link my antivirus detected threat, I deleted link {Butcher}) is right, but i don't see any visible gold on this diode

 

[johnny309]

Ok ...that's equal 3.35 mg/piece...witch I think is refering(giving the small amount) to the bonding wires from silicium pad to copper terminals.
When you crush the resin ....the tiny wires remain in the resin....this is why you don;t see them.
Incineration and crushing will be suited for this.

 

[macfixer01]

Ok ...that's equal 3.35 mg/piece...witch I think is refering(giving the small amount) to the bonding wires from silicium pad to copper terminals.
When you crush the resin ....the tiny wires remain in the resin....this is why you don;t see them.
Incineration and crushing will be suited for this.

Yes when you put it that way, 3.35mg per piece doesn't sound like so much.