Hi,
There was a PCN published, I can not remember number now but....
In past all devices used gold wires for bonding to pins. From some time we have started to use Copper. However, there was still requirement for gold.
The automotive devices with gold are labeled as Gxxxxx and with copper as Sxxxxx. Devices which starts with MC (general devices) are mask independent (if you order you can get any mask available in store) and also bonding is not defined.
Best regards,
Ladislav