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I'm trying to find a data sheet for C18071S but can't find any references to this component anywhere. It's a 40pin PDIP. Any help most welcome!

Edit: Added schematic. I hope this will help identification.

Image of IC Schematic

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    \$\begingroup\$ Mike - Hi, FYI these are the current "Component Identification Question Guidelines". The more information you can supply from that list, the better the chances of identification. For example, what is the functionality of the overall PCB/product? What other components are close to that one, which might help to narrow down the choices of possible functionality of that device? etc. Please edit the question to add any new information or photos. Thanks. \$\endgroup\$
    – SamGibson
    Mar 26 at 14:54
  • \$\begingroup\$ It may well be some mask-programmed microprocessor or even more problematic, an ASIC, specifically made for that product, and no longer available even from the manufacturer. What next? \$\endgroup\$ Mar 26 at 15:32
  • \$\begingroup\$ @SamGibson, thanks for the suggestion! Added schema. \$\endgroup\$
    – Mike
    Mar 26 at 16:11
  • \$\begingroup\$ @BrianDrummond, yes, quite possible. I did however find the the type number, including "TAZ", on this site: chip-sale.com/catalog9/cat/3325.php, so hopefully it's not an ASIC. \$\endgroup\$
    – Mike
    Mar 26 at 16:14
  • \$\begingroup\$ @Mike - Thanks for adding that partial schematic. It's certainly strange! Is there anything else you can add from that list e.g. what does the overall system / product do? Do you have any more of the schematic? A wider-angle photo to show surrounding components? Do you have any idea what function the IC might perform, based on your knowledge of the overall system and research so far? I presume that this unknown IC is D8 in the schematic. It seems that D7, D9-D11 perform some sort of 15V-to-10V translation. Any more details of them? D8 is annotated "3-PH WRS" - does 3-phase make sense? \$\endgroup\$
    – SamGibson
    Mar 26 at 16:18
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Only a partial answer, but Google search suggests it is an obsolete inverter controller. Since several sources purport to sell it, why not try contacting those sellers for more detail?

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    \$\begingroup\$ Thanks! Indeed, google turned up more answers than duckduckgo. I mailed one of the sources and asked for a quote on 25pcs, but they had no stock at this time. I will try a few others. \$\endgroup\$
    – Mike
    Mar 28 at 15:58

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