[vcf-midatlantic] Can anyone identify this mystery IC

[Douglas Crawford]

These are the transistors?
https://imgur.com/aLpqVpE
I got one additional response from another designer:
"Looks like some kind of gate array with only the metalization layer 
being clearly visible. I worked on alot of these in the late 70's. I 
have no explanation for the bonding pad structures."


On 8/21/2022 11:27 AM, Dave McGuire via vcf-midatlantic wrote:
> 
>    I would say quad or hex, rather than dual.  You can see it by finding 
> those six sets of transistors, three on each side, each with the same 
> sets of leads brought out to pins.  Hex inverter, a-la 7404 but mil-spec?
> 
>    I agree that the asymmetrical package is very unusual.
> 
>    The density is so low that we should be able to suss out its function 
> given a bit of study.  Already the Vdd/Vss pins are identifiable at the 
> center top and bottom.
> 
>             -Dave
> 
> On 8/21/22 11:23, Douglas Crawford via vcf-midatlantic wrote:
>> A little more...  https://imgur.com/f4noWuk
>>
>> We have this on display under a microscope at VCF Mid-Atlantic museum.
>>
>> It is strangely constructed to my eye.
>> no lead frame or bond wires.
>> Its build ON the leadframe.
>> Its symmetrical, appears to be a dual something.
>>
>>
>> A mixed signal IC design collegue said:
>> ----
>> That lead-frame is really weird.
>> It seems to be some sort of flip-chip, but the leads don’t even line 
>> up from one side of the chip to the other!
>> Never seen anything like it.
>> The only other thing I would GUESS is that this is some sort of analog 
>> IC, probably bipolar.
>> ----
> 
>