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Where can I find 78H12, 78H15, 79H12, 79H15? Or something similar?

Discussion in 'General Electronics Discussion' started by Vinnie Lee, Mar 11, 2016.

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  1. Vinnie Lee

    Vinnie Lee

    7
    0
    Mar 11, 2016
    Hi guys and gals! Where can I find these regulators? I've been searching for a week, but can't seem to find any legit source for 78H12, 78H15, 79H12, 79H15. Tried Mouser, no result.

    I need some +12V regulators, some -12V regulators, some +15V regulators, and some -15V regulators. And they can handle 5A. I think these kind of things are TO-3.

    I found tons of Chinese knockoffs(mainly National Semiconductor), and they can't even handle 1A!
    Are they discontinued? If so, what's the substitutions?

    Thanks!
     
  2. shrtrnd

    shrtrnd

    3,827
    524
    Jan 15, 2010
    That's an old one. Did you try eBay?
    I see them there.
     
  3. CapSteel

    CapSteel

    14
    3
    Mar 7, 2016
    LT1084 is a 12V, 5A regulator (check Digikey).
     
  4. AnalogKid

    AnalogKid

    2,573
    740
    Jun 10, 2015
    Linear Technology and National Semiconductor (now owned by TI) make positive and negative 5 A regulators. Do they have to be fixed, or can you use adjustable parts like the LM338?

    ak
     
  5. Vinnie Lee

    Vinnie Lee

    7
    0
    Mar 11, 2016
    Thanks guys! I ordered some LT1033CT and some LM338T/NOPB.
    BTW, what does NOPB mean?
     
  6. AnalogKid

    AnalogKid

    2,573
    740
    Jun 10, 2015
    Since Pb is the symbol for lead, these probably have a lead-free plating on the leads (NOPB = no lead). Also called RoHS compliant - reduction of hazardous substances (or sonething like that).

    ak
     
    Vinnie Lee and davenn like this.
  7. Vinnie Lee

    Vinnie Lee

    7
    0
    Mar 11, 2016
    Thanks, AK, that makes sense.

    Do you know any linear LDO that can do negative adjustable (around -12V, 3A or higher)? I'm trying to find a negative linear LDO to go with my LD1084V (to build a 2A linear +12V &-12V PSU).

    And, if I design my PSU to the 230Vac/+-10% standard (for Europe customers), should I include 207Vac and 253Vac? I mean, that's a wide range.

    I could design it as 207Vac, if someone in Europe use my PSU on 250V mains, there'll be more heat. Or, I could go for 230Vac, less heat, but I'm afraid of the increasing ripple and noise when it's used on 210Vac...Also, less output current.

    I know that's a lot of questions, but I'm kind of pulling my hair now.
    Thanks!
     
    Last edited: Mar 13, 2016
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