My old data book collection

Discussion in 'Electronics Resources' started by RichardO, Nov 18, 2014.

  1. brainsmartman

    New Member

    Dec 30, 2017
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    Later edit:

    I apologize. Due to the fact that the types of transistors are not very well distinguishable, I have hardly managed to realize that the hfe characteristics for each type are given.
    Thank you again Mr. Bertus.

    PS Can you tell me what is called the catalog?
     
  2. toyrobot

    New Member

    Feb 13, 2018
    2
    0
    I've spent the past week googling off and on to find the data sheet for this old transistor. I'll attach a picture.

    Markings are (3 lines):
    Thomson logo (?) with 07
    H41
    309

    It seems to be an NPN since plugging it into the multimeter's transistor tester socket for NPN EBC slots yields an hFE of around 260.

    I have a handful of these from years ago, but no data sheet and google hasn't helped. I actually used it in a low (medium?) current "solar engine" circuit recently, but it would be nice to get my hands on all the specs, particularly the maximum current it can handle.

    I noticed that some older Thomson data books are among the list from the stickied post "Data Book Collection":
    https://forum.allaboutcircuits.com/threads/data-book-collection.103744/

    i.e. the thread that sent me here.

    Thanks in advance for any help or advice!
    picsay-1518576760.jpg
     
  3. Mark_d

    New Member

    Mar 30, 2016
    2
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    I'm looking for information on a National Semiconductor IC that was available in 1995.
    The part number is MM9093N .
    I've found several National data books in the links but none list this chip.
    Any ideas how I might find it?
    Thanks.
    Mark
     
  4. RichardO

    Thread Starter Well-Known Member

    May 4, 2013
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    728
    I don't recognize the part number. Do you know what the part is? Also, double check the number.
     
  5. RichardO

    Thread Starter Well-Known Member

    May 4, 2013
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    Wow that is a tricky one. I don't see anything that looks like a part number. Is it possible that is is a house marking and not a standard part number?
     
  6. toyrobot

    New Member

    Feb 13, 2018
    2
    0
    Quite possible that it's a house marking I guess, especially since standard googling doesn't get very far.

    I wish I could remember when & where I got the transistors. Probably during college in the late 80s or into the early 90s. Not sure if I got them in a lab kit, freebies from a prof or some sort of grab-bag of parts that I bought!? Stuff I got from Radio Shack I usually only have one or two parts due to their packaging, etc. And I have about 10 of these mystery transistors...

    I found them in my old tackle box of parts as I got interested in robots & Arduino stuff recently.

    One other clue that wasn't shown in the pic from my previous photo was that all of these mystery transistors have a splotch of brown paint on top. I'll attach another pic.

    I wonder if that indicates a house part? Surplus? Out-of-spec parts?

    Does anything look like a date in those lines of text? 309 - 9th week of 83?? I'm pretty new to this transistor sleuthing, although I've been harvesting components from old "junk" car stereos lately (got a bunch of C945s recently :), but a quick google usually identifies them & gets the datasheet.
     
  7. Mark_d

    New Member

    Mar 30, 2016
    2
    0
    Hi Richard,

    Thanks for your response.
    With some obscure searching I've discovered it's a custom logic chip so the details won't be available in the public domain.

    Regards,

    Mark
     
  8. KeepItSimpleStupid

    Well-Known Member

    Mar 4, 2014
    2,309
    416
    Here's one for you. There is an old National Semiconductor Datasheet that has an LM317 used that showed how to make a high voltage regulator using the LM317 and a tube.

    Mullard SAB3023 Receiver and Analog Memory
    Remote Control Receiver
     
  9. bertus

    Administrator

    Apr 5, 2008
    17,634
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  10. KeepItSimpleStupid

    Well-Known Member

    Mar 4, 2014
    2,309
    416
    yep, that one. Thanks.
     
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