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IR 9319 Transistor

Discussion in 'Electronic Design' started by Phil, Jun 8, 2007.

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  1. Phil

    Phil Guest

    I have a blown International Rectifier transistor out of an electric
    wheelchair , this is a IR 9319 TO-220 case and I can't find any info. or
    cross reference on this trans. , any help would be appreciated.
    Phil L.
  2. Eeyore

    Eeyore Guest

    I suspect 9319 is a date code.

    IR9319 is a voltage comparator by Sharp

  3. D from BC

    D from BC Guest

    I could be wrong but perhaps the part was made in 1993 on the 19th
    D from BC
  4. Phil Allison

    Phil Allison Guest


    ** Have a real close look at the pack with a bright light and a magnifier -
    cos you have missed the type number and supplied the 4 digit date of mfg

    Check the other, similar ones if the dud is illegible.

    ....... Phil
  5. Phil

    Phil Guest

    Thanks for the help , the 9319 was the date and the P/N is PMC-NE8 and yes I
    can't find it for the home repair guy, Phil L.

  6. The units I've seen used IR's power mosfets. The voltage and current
    ratings will narrow it down, but have you contacted IR to see if they
    can cross reference it?

    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
  7. Meat Plow

    Meat Plow Guest

    What about the chair manufacturer?

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  8. Good luck trying. If it is a custom marked part, they will insist on
    selling a new controller like the rest of the industry. They claim that
    any repair is a liability issue, so they can't sell repair parts, only

    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
  9. Meat Plow

    Meat Plow Guest

    The repair of the chair may be covered under the owner's insurance. I
    would at least give it a try provided the manufactures is still around.
    If the chair belongs to a non-ambulatory person that needs it there may be
    other alternatives like a new chair.

  10. That seems to be what the manufacturers want. If it needs more than
    batteries, they want to sell a new one. I have a Jet One that was given
    to me after being in storage for over four years. Needless to say, the
    two glass mat gel cells are open, and a pair of new batteries are over
    $200, plus shipping. A pair of standard garden tractor batteries with
    the same AH rating are about $70, so I am looking at putting the
    batteries on a mini trailer that started life as a pressure washer
    chassis. There is room for a larger 12 V battery on the cart to power
    my wireless laptop, and if it works, the electric convertible top I'm
    designing. Then all I'll need is a 12 V powered cooler for the top of
    the trailer to keep cold drinks and snacks. ;-)

    BTW, I've pretty much given up of the repair newsgroup.

    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
  11. Meat Plow

    Meat Plow Guest

    LOL so I take it you need the chair? If so I know what it's like. I have
    an ankle that's ready to explode (motorcycle accident 30+ years ago).
    I have a removable cast called a CROWE that is about the only way I can
    walk. I now use those powered buggies in WalMart and other places. I need
    about 4 hours under the knife and saw to fix the problem and maybe get a
    few more years out of it.

    I still sub to it but it's pretty boring. I like reading Arfa even though
    he tends to get real wordy.

  12. I have had to use a cane for several years, and i want it ready, when
    i need it. it would also be nice for the events at the Veterans Park.
    I can never find a comfortable place to sit, and can't move fast enough
    to get some of the photos I'd like. Then all I would need are some ID
    decals, and a press pass.

    I like him, its the whiners who are too damn lazy to look for
    something, but DEMAND help that I'm sick of. BTW, that PMC-NE8 part
    number for the chair is available form a number of online sources, if
    the OP would just stick the number into Google or another search engine.

    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
  13. Rich Grise

    Rich Grise Guest

    With a schematic, a good tech should be able to figure out a suitable

    Good Luck!
  14. The Phantom

    The Phantom Guest

    Is there another one of the same p/n on the board which isn't blown? If
    so, you could temporarily remove it and measure the breakdown voltage and
    Rds on. Then a perusal of the data book from 1993 would give you a very
    good idea of the real IR p/n. A more recent part to replace it would
    probably have better specs, too.
  15. Phil Allison

    Phil Allison Guest

    "The Phantom"

    ** But you do not want that - a mosfet with a significantly lower Rds on
    would hog all the current to itself.

    The original parts may very well be selected ( ie for low gate voltage
    drive) and Rds on matched too.

    Testing one of the originals properly is essential - not just blindly
    matching the part numbers or dropping in a superior equivalent.

    ........ Phil
  16. The Phantom

    The Phantom Guest

    You are assuming that the part came from a circuit where it was sharing
    current with others. The OP didn't say anything that would allow us to know
    whether this is the case or not.

    And, I didn't say to replace it with a part having lower Rds on; in fact, the
    reason for measuring Rds on would be to find a replacement with similar Rds on.
    When I said the replacement would probably have better specs, I was thinking of
    SOA and thermal resistance.
    And they may very well not be. There's no way to know without seeing the
    schematic. If examination of the circuit where this part was removed indicates
    that current sharing with other parts is important, then *all* of them should be
    replaced with matched parts because if one of them blew up,the others may well
    be damaged. It will be up to the person doing the repairs. We can only hope he
    knows what he's doing.
    It might be essential; it might not be. We just don't know how important it
    is to get a really good match to the original part. The blown part may have
    come from a non-critical part of the circuitry.

    But measuring Rds on and breakdown voltage as I suggested will help get you
    close to a correct part. And there's certainly nothing wrong with dropping in a
    part with superior SOA.
  17. Phil Allison

    Phil Allison Guest

    "The Phantom"

    ** Bollocks - he certainly did.

    ** No-one can tell what you were thinking but failed to write down.

    ** Superfluous contradiction.

    ** Irrelevant to alerting the OP to the likely technical issues he faces.

    ( snip opinionated drivel - should ship the lot, really )

    ** Superfluous contradiction #2.

    Irrelevant to alerting the OP to the likely technical issues he faces.

    ( snip more opinionated drivel - should ship the lot, really)

    ** So says a fool who requires others to be telepathic.

    ....... Phil
  18. The Phantom

    The Phantom Guest

    Quote it, then.
  19. Phil

    Phil Guest

    I appreciat all the comments , this chair or scooter belongs to an elderly
    person that my son knows , company has discontinued the unit and won't give
    any tech. support , the thing fell into my hands to fix , as an old Ham
    Operator I will give it a try , PC board for controler was made by Curtis
    and I know that they have also washed there hands of it , the control has
    relays to change direction and has two banks of three Mosfets and each bank
    of three are wired in parallel , I finally ordered a set of three NTE 2388
    mosfet's from mouser and if everything works out I will replace one whole
    bank and not just one part, am hopeful the the Gate resistance if OK ,
    Thanks Again , Phil L.
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