Connect with us

What's so special about these op amps?

Discussion in 'Electronic Design' started by Bob Engelhardt, Jan 12, 2013.

Scroll to continue with content
  1. I found these devices at the "swap shop" at our dump; not having any
    idea of what they were. I Googled them and found this:
    http://www.intersil.com/content/dam/Intersil/documents/fn29/fn2902.pdf

    Summary:
    • Bandwidth 12MHz
    • Input Impedance 500MΩ
    • Input Bias Current 1nA
    • Input Offset Current 1nA
    • Input Offset Voltage 0.5mV
    • Gain 150kV/V
    • Slew Rate 7V/µs

    The data sheet has a 2006 date & there weren't many sites offering them,
    but a couple that did had prices up to $43! Each! WTF? What makes
    these so dear? (It's probably obvious, but not to me, if so please
    excuse my newbie-ness.)

    Bob
     
  2. Tim Williams

    Tim Williams Guest

    2902, isn't that a variation on the LM358 (158/258/...)?

    Price doesn't mean much, could be scalpers trying to scam people on
    availability.

    Tim

    --
    Deep Friar: a very philosophical monk.
    Website: http://seventransistorlabs.com

    I found these devices at the "swap shop" at our dump; not having any
    idea of what they were. I Googled them and found this:
    http://www.intersil.com/content/dam/Intersil/documents/fn29/fn2902.pdf

    Summary:
    • Bandwidth 12MHz
    • Input Impedance 500MΩ
    • Input Bias Current 1nA
    • Input Offset Current 1nA
    • Input Offset Voltage 0.5mV
    • Gain 150kV/V
    • Slew Rate 7V/µs

    The data sheet has a 2006 date & there weren't many sites offering them,
    but a couple that did had prices up to $43! Each! WTF? What makes
    these so dear? (It's probably obvious, but not to me, if so please
    excuse my newbie-ness.)

    Bob
     
  3. Guest

    There MIL-SPEC parts so the price is jacked through the roof. Now you know why the government is broke.
     
  4. Joerg

    Joerg Guest

    Most likely because in this day and age a TO-can for an opamp makes it a
    boutique part, just like a ceramic DIP package would. Maybe there were
    also some incantations, those can be expensive :)
     
  5. Joerg

    Joerg Guest

    You don't need such a dinosaur for that. I used a 44V opamp from fresh
    production in a design lately, just a regular COTS part from ONSemi I
    think. If someone needs to know I can dig it out.

    But that one doesn't come in a glass tube or TO can :)
     
  6. John S

    John S Guest

    Try to find one to buy. Maybe that will tell you something.
     
  7. So, there's nothing special about what they do - it's just the mil
    spec-ness and the rarity that costs so.

    Thanks,
    Bob
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-