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It is often necessary to re-bond a bare die. Typical reasons include:
: Has anyone tried wirebonding to FIBbed pads?
Several firms sell refurbished wire bonders and provide service, support, and parts. Some of these companies will also do custom bonding projects for single dies or small lots.
If any existing bonds, or pieces of them, are still on the pads these must be removed first.
Pads should be clean and undamaged.
: Get a photo of a nice clean pad that copper bond wire was etched off of
The die must be secured firmly to its new package to keep it from moving around. AZ has had good experiences using a tiny dot of cyanoacrylate adhesive, although epoxy or Crystalbond would likely work fine as well.
: Get a photo here
Bonding to a clean, once-bonded pad should be essentially the same as bonding to a never-bonded pad. Contact resistance may be a little higher and reliability reduced, but this isn't a big concern if you just want to dump the firmware.