Quote:
Originally Posted by emeritus
You will find it virtually impossible to find data on such custom devices if the company who had them made is no longer in existence.
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Yes, I thought as much. I had also wondered if the IC might have some markings on its under surface, but I don't want to take it off the pcb, unless perhaps it fails.
I'm a bit suspicious of metal top ceramic IC's. They look beautiful enough, but I think some may possibly get the same type of tin whisker problem seen in AF11x transistors, that is if the tops are tin plated. For example I had a batch of other ceramic metal top digital logic IC's, never used and very well packed/stored, in theory they should have worked but two out of about 12 were stone dead. I seldom see this with batches of NOS plastic or ceramic case 74 series logic IC's without the metal tops. Only perhaps one dud in many hundreds if that. I really should crack the tops off the dead ones and look with the microscope to see if I can identify why they failed.