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Trying to find out what this one is has been a real head-scratcher. Google leads me down numerous rabbit-holes to dead ends. And I see 1 or 2 for sale on eBay, but apparently they have no idea what it is either. Insight, help, moral support would all be greatly appreciated - thanks! Fairchild HL41109QB

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  • \$\begingroup\$ What are the devices used in? Where did you get them or see them? \$\endgroup\$ – Andy aka Sep 13 at 16:57
  • \$\begingroup\$ This question is the top google hit for HL41109 so clearly it is not a commonly known part. There is no reason it can't be a custom or customer configured part. If you are trying to replace them @Andy aka has the right suggestions, if you are trying to price or market them good luck. \$\endgroup\$ – crasic Sep 13 at 17:23
  • \$\begingroup\$ The IC's in OP's photo have especific codes written in: "176-148" (for that one fabricated in 7532), "176-090A" (fabricated 7631), and the one selling in ebay has "176-221" (fabricated 7719). I would preffer to be out of this hand; if I really had to bet, I would bet that this is a mask ROM. \$\endgroup\$ – mguima Sep 13 at 17:53
  • \$\begingroup\$ If this is a custom marked version of a part with a public datasheet, you might find it in bitsavers.org/components/harris perhaps in the 1975 databook. Unfortunately they don't seem to have die photos. If this was a fully custom ASIC with no public datasheet, there is no way to identify it. \$\endgroup\$ – MarkU Sep 13 at 22:11
  • \$\begingroup\$ @Andy - As to where I got them, that’s a really good question... My company has been buying and selling scientific, medical and industrial surplus for over 20 years. I squirreled these away sometime ago and am thinking its government lab related surplus or maybe really old Hewlett Packard material. \$\endgroup\$ – John - Head Miner - PartsMine Sep 14 at 21:50

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