enter image description hereI found some parts in my junk drawer that I can't identify. I'm pretty sure they're National Semiconductor hybrid circuits from 1969-1970, but I have no access to a National Hybrid Products databook. The part numbers are:

  • NS NH0009C
  • NS NH00012C

Both are in 12-lead TO-8 cans. Does anybody know what these are, or better yet, can point me to a datasheet?


  • 7
    \$\begingroup\$ Are you contemplating using them for an unknown project (that you cannot yet define) because you have no idea what the parts are or, whether they are reliable enough for anything (based on their unknown 40+ year history in a junk-draw)? \$\endgroup\$
    – Andy aka
    Jun 25, 2019 at 12:43
  • \$\begingroup\$ I remember those part numbers as “Damn Fast Buffers” maybe? \$\endgroup\$ Jun 25, 2019 at 12:55
  • 2
    \$\begingroup\$ LH0033 is buffer;LH0063 is damn-fast buffer. \$\endgroup\$ Jun 25, 2019 at 13:02
  • \$\begingroup\$ Picture? There might be another clue. \$\endgroup\$
    – Mattman944
    Jun 25, 2019 at 13:37
  • 1
    \$\begingroup\$ I added a picture of the devices. They're big packages... diameter is a little over 1/2".Having no data, I have no plans for them, and am just curious what they are. Although that could change if they end up being something interesting. \$\endgroup\$ Jun 25, 2019 at 16:10

1 Answer 1


The NH prefix doesn't mean they are hybrids. There's an article in March 1970 Electronics World magazine (https://www.americanradiohistory.com/Archive-Electronics-World/70s/1970/Electronics-World-1970-03.pdf) that lists the NH0009 as being a clock driver IC. I couldn't find a listing for the NH00012 anywhere, but I would be willing to bet that it is a similar part. Several places where I've worked had big shelves of data books, but they all went in the trash when parts data popped up online. I can't help but wonder if there might be copies hanging around in the basements of libraries of colleges that still teach electrical engineering though.

Actually I have to rescind this answer because I just checked the internet archive’s text copy of the National 1972 MOS IC data book and it says the dual clock driver IC was a MH0009C so this looks like the reference in the EW article was a typo.

  • \$\begingroup\$ Cool. A two phase clock driver. Early processors often needed two clock phases. \$\endgroup\$
    – Mattman944
    Jun 25, 2019 at 16:59
  • \$\begingroup\$ It isn't just the "H" in NH that makes me suspect they're hybrids... it's the size of the package, and knowing that National did indeed implement some hybrid circuits in that same package. It'd be ironic if I unknowingly had an integrated 2-phase clock driver back then, since I ended up making my own 12-volt 2-phase clock driver out of discretes. \$\endgroup\$ Jun 25, 2019 at 17:56

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