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13003 transistors...TO92?!?

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    13003 transistors...TO92?!?

    Ok I think I found another fakey.

    A CFL burned out on me so I opened it... found the tube had both heaters open (weird!!!). Trash time.

    Then I looked at the driver board. I found two 13003 transistors... they're TO-92! Aren't they supposed to be TO126? And yes, the 13003s appear to be OC....

    Oh well, I guess nothing to salvage from this CFL. At $0.50, it's no wonder they cheaped out as much as possible.

    Pictures, when I get a chance...
    Last edited by eccerr0r; 11-26-2017, 09:44 PM.

    #2
    Re: 13003 transistors...TO92?!?

    no, you can get them in to92 - i got some from RS for a repair.

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      #3
      Re: 13003 transistors...TO92?!?

      Ah okay. All the other 13003's and the datasheet I pulled up has it TO-126 which is what I'm more familiar with. So I suspect the thermal resistance is higher for the TO92?

      Not sure how many watts either can dissipate without heatsinking...

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        #4
        Re: 13003 transistors...TO92?!?

        I laughed when I first saw them, the little guys are popular in CCFL/LED bulbs, 12V 20W halogen lighting and crappy AC-DC wall warts from the gutters of guangdong.

        taiwan MJE13003 is rated 400V 1.5A 20W max. in TO-126 and 1.5W in TO-92.

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          #5
          Re: 13003 transistors...TO92?!?

          Ha. that's 20W with a heatsink; without one like in most CFLs - only 1.4W (and 1.1W for the TO-92 in the same situation) - no wonder why they started using TO92, only a little lower limit...

          Granted I have seen dead CFLs with (slightly) heatsinked TO220s... forgot if they died or not.

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            #6
            Re: 13003 transistors...TO92?!?

            It's the same design family as the MJE13005, 13007, and 13009 (the intermediate steps were lower voltage). Originally the MJE13003 was TO-126. I guess the die fits in a TO-92 package and suits a particular low-cost niche. If I were repairing and they fit I'd upgrade to the TO-126 part.
            PeteS in CA

            Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
            ****************************
            To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
            ****************************

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              #7
              Re: 13003 transistors...TO92?!?

              I suppose so. As it was in a $0.50 CFL lamp, it's not worth to repair it because it suffered multiple failures:

              - both 13003s are shorted C-E
              - both heaters of tube are open
              - both 10 ohm emitter resistors are fried.

              I kept the 0.47 ohm fusible resistor, at least that seems to still be working. The transistors saved the fuse as always.

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                #8
                Re: 13003 transistors...TO92?!?

                Originally posted by eccerr0r View Post
                The transistors saved the fuse as always.
                Too bad they don't use a transistor for the fuse too
                "The one who says it cannot be done should never interrupt the one who is doing it."

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