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Crossing NTE transistors to industry numbers

Discussion in 'Electronic Repair' started by [email protected], Sep 12, 2006.

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  1. Guest

    Is there any way possible to determine which industry numbers will
    cross to a particular NTE number? I need to replace a fairly large
    number of 2N6254 audio output transistors and I have access to many
    2SC, 2SD and some 2N numbers etc. The 2N6254 crosses to an NTE181.
    Without going through and trying to look up every single one can the
    NTE database be run backwards? Or perhaps is there any other way to
    extrapolate this information? Thanks very much. Lenny Stein, Barlen
    Electronics.
     
  2. You think of suitable numbers and then check them in the cross-reference.

    I started doing that back in 1974 with an HEP replacement guide, and it was
    a good way of getting a basic idea of what a device was. Saved having to
    check multiple books just to see whether a transistor was NPN or PNP. The
    cross-reference section in the NTE guide is far larger than that old HEP
    guide, and of course it's now faster when you can do the look up
    electronically.

    Michael
     
  3. Mike WB2MEP

    Mike WB2MEP Guest

    Lenny,

    The older Dalbani catalogs had a reverse NTE cross ref. in them.
    I don't know if they still do, or even if they're still in business.

    Mike
    WB2MEP
     
  4. Jim Land

    Jim Land Guest

    Yeah, they're still in business, but they don't seem to carry NTE any more.

    http://www.dalbani.com
     
  5. GregS

    GregS Guest

    Just using the transistor cross reference, I get 2SD371
    Using my Towers book, BDY20 2N3055 (HAhAhA)



    Using my Japanese cross booklet for, I get 2SD716 2SC1667

    I would check out the specs first on the last two.

    off my page
    http://www.pitt.edu/~szekeres/shopchip.htm

    greg
     
  6. Tim Schwartz

    Tim Schwartz Guest

    Len,

    The 2N6254 is a 100V, 15A, 150 watt transistor. MCM Electronics
    (www.mcmelectronics.com) has them in stock.

    Reverse cross referencing is tricky, as usually the 'universal subs'
    choose one transistor to replace many. So, comparing the 2N6254 to the
    NTE 181: original here:

    They are both rated for 100V

    The NTE is rated for 30 amps instead of 15A

    The NTE is rated for 200 watts instead of 150 watts.

    Unfortunately, by doing a "reverse look up" you don't know if the other
    device is good enough, for example, it might be rated only 12 amps. So,
    you have to carefully compare the device you are replacing (2N6254) with
    the device that you want to replace it with.

    While in general, higher break down voltage, higher current and higher
    dissipation ratings are OK, they also DON'T tell you about the gain of
    the transistor, or the frequency response. If you have a bunch of
    output transistors in parallel, they should all be of the same type, and
    in a perfect world, gain matched as well, as you want the load spread
    evenly across the bank.

    The frequency response can also be a problem. If it is too high then
    the amp may have problems with oscillations.

    When using transistors that I can't curve trace, I try to use the same
    lot number in the bank. Sometimes this requires buying a few extra
    transistors.

    Regards,
    Tim Schwartz
    Bristol Electronics
     
  7. GregS

    GregS Guest

    Just goes to show you, after checking any replacement guide, verify the specs.
    That 2SD371 shows ony 6 amps. Sometimes you can up the current if the voltage
    is over rated. Back referencing the 2n3055 you get

    ECG130 2N3055 2N3715 2SD878 2SD492 2N3716
    2N3055 2N3715 2SD878 2SD492 2N3716 ECG130
    2N3234 2N3055 2N6262
    2SD492 2N3055 2N3715 2SD878 2N3716 ECG130
    2SD878 2N3055 ECG130
    96-5397-01 2N3055 2N3716 ECG130
    40251 2N3055
    BD181 2N3055 ECG130
    BDW51A 2N3055
    BDY10 2N3055
    BDY20 2N3055 ECG130
    SJ2515 2N3055
     
  8. http://www.flippers.com/X-Ref-ECG.html

    ECG = TCG...

    John :-#)#
    --
    (Please post followups or tech enquires to the newsgroup) John's
    Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call
    (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
    www.flippers.com "Old pinballers never die, they
    just flip out."
     
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