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SMT LM1496?

Discussion in 'Electronic Design' started by Jim Meyer, Aug 25, 2003.

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  1. Jim Meyer

    Jim Meyer Guest

    I can't seem to find a surface mount version of the venerable LM1496.
    There are some SMT Gilbert cell balanced modulator-demodulator chips
    out there but they all seem to be for 1 GigaHertz and some don't even
    go down to DC. I need to convert 20 MHz to baseband (DC) just like
    the LM1496 does but in a smaller package.

  2. Jim Yanik

    Jim Yanik Guest

    (Jim Meyer) wrote in
    I've seen this IC in a SOIC 14 DIL pkg.;in Tektronix TV test equipment.
  3. Jim Yanik wrote...
    Right. This part was originally the Motorola MC1496, now made by
    ON Semi. They offer the MC1496D, which is a 14-pin soic package.

    FreeTradeZone says that Allied, Newark (p/n 52F3163 for $0.69),
    Future and Avnet Marshall all have this version in stock. (NJR
    apparently offers the NJM1496 in two 14-pin soic package sizes,
    their dmp14 and ssop14.)

    - Win

  4. On Semiconductor has them: MC1496

  5. R.Legg

    R.Legg Guest

    I suppose you've tried MC1496? (this is originally a Motorola device -
    Nat Semi was a second-source)

    On Semi list four grades of SOIC-packaged versions. MC1496D and
    MC1496BD are in 55pc rails.

    Availability seems a bit of a problem. Partminer only offers to sell
    directly with a $250 minimum line item.

  6. Jim Meyer

    Jim Meyer Guest

    (R.Legg) wrote in message

    I'm ashamed to say that I simply assumed that the 1496 was
    obsolete and if available would only be in the DIP package.

    I've just ordered some free SMT samples from On Semi. I guess
    the good (devices) *don't* die young. :cool:

  7. Michael Black wrote...
    Dozens of chips more than 30 years old are still in
    full-scale production. Some, like the 741, 555, 324
    and the 723, etc., are still massively made and used,
    in part because they get the job done and they're very
    inexpensive. They may go under various names, such as
    UA723, LM723, MC1723, CA723, KA723, SA723, JL723, SG723,
    and NJM723 for the venerable voltage-regulator IC, but
    they're certainly out there, probably for prices well
    under 10 cents in quantity.

    - Win
  8. Yes, let's face it- the first chips designed were made by people who truly
    understood electronics and targeted the designs at very basic tasks that people
    will still be performing as long as electronics exists. There is a great deal
    to be said for simple, robust designs.


    Chip Shults
    My robotics, space and CGI web page -
  9. Phil Hobbs

    Phil Hobbs Guest

    There's also something to be said for litho tools that you can still get parts for.
    The lifetime of some of those parts may be limited by how long you can run lenses
    repaired with duct tape. ;-)


    Phil Hobbs
  10. Motorola advised us that the T0-5 cased parts were being phased out
    because the higher cost to manufacture, along with most other metal
    cased parts.
  11. Tim Shoppa

    Tim Shoppa Guest

    The LM709 *is* still stocked by Digi-Key (TO-99 package), and the
    electronics shop up the road still has NTE909's which I believe is an
    exact replacment.
    Going by the date there, it's going on 40 years old.

  12. Peter

    Peter Guest

    The 709 was pretty hard to use (unstable, IIRC)

    I still use the LM358, which must date back to early 1970s. The best
    choice for any undemanding application.

  13. Jim Thompson

    Jim Thompson Guest

    The ua709 was indeed unstable.

    Some legacy parts may still be obtained through Lansdale Semiconductor
    ( ). My first OpAmp, MC1530/31 (around
    1963-1964), is still available.

    ...Jim Thompson
  14. Jim Thompson wrote...
    Not a single PNP transistor to be found, were the
    lateral PNPs really that bad back then?

    - Win
  15. Jim Thompson

    Jim Thompson Guest

    We had them, but the spacing rules in those days was like 10um, making
    the beta around 3-10 at 100uA. (I hadn't yet discovered my "magic"
    beta fixer ;-)

    The MC1530 had substantial GBW and slew-rate for its time... around a
    10MHz useable GBW product and 6V/us slew-rate.

    ...Jim Thompson
  16. Ken Finney

    Ken Finney Guest

    As someone else mentioned, they are making a part with the same part number,
    I wonder how much the electricals have changed over the years? There is a
    reason the data sheets say the manufacturers reserve the right to change
    anything in the data sheet at any time. For the LM741, I know that National
    uses a different die for their space level parts than then do for their
    military part, and a different die for their 883 parts, and a different die
    for their commercial parts.
  17. Bill Sloman

    Bill Sloman Guest

    Well, it needed two frequency compensation capacitors and a frequency
    compensation resistor, but if you followed the data sheet carefully
    you could choose values which would stop it oscillating, even at
    unity-gain. Hell, I managed to design and assemble several 709-based
    circuits in the late 1960's when I was a wet-behind-the-ears graduate
    student in the chemistry department, and none of them oscillated.

    I didn't even managed to blow up the input stage by exceeding the
    absolute maximum differential voltage, which was only about seven

    The LM301 was much nicer, when if finally arrived.

    The LM324 quad amplifier arrived rather later, and the version of it
    with only two amplifiers in one package - the LM358 - arrived even
  18. Ken Finney

    Ken Finney Guest

    Agreed. But I am mainaining military hardware. My stuff is supposed to be
    in the air through 2037.
  19. Jim Thompson

    Jim Thompson Guest

    Now that's *scary*!

    ...Jim Thompson
  20. Ken Finney wrote...
    These are just obvious inventory issues for obsolete ICs.
    I'm sure Jim's right for most "production" ICs. BTW, in
    case you haven't learned this, there's a serious misguided
    FASB rule that affects such inventory decisions, and helps
    to create these apparently-skewed results.

    - Win
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