13003 transistors...TO92?!?

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  • eccerr0r
    Solder Sloth
    • Nov 2012
    • 8701
    • USA
    #1

    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.
    Tags: None
    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 31002
      • Albion
      #2
      Re: 13003 transistors...TO92?!?

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

        Comment

        • eccerr0r
          Solder Sloth
          • Nov 2012
          • 8701
          • USA
          #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...

            Comment

            • redwire
              Badcaps Legend
              • Dec 2010
              • 3906
              • Canada
              #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.

                Comment

                • eccerr0r
                  Solder Sloth
                  • Nov 2012
                  • 8701
                  • USA
                  #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.

                    Comment

                    • PeteS in CA
                      Badcaps Legend
                      • Aug 2005
                      • 3579
                      • USA, Unsure of Planet
                      #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.
                      ****************************

                        Comment

                        • eccerr0r
                          Solder Sloth
                          • Nov 2012
                          • 8701
                          • USA
                          #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.

                            Comment

                            • Per Hansson
                              Super Moderator
                              • Jul 2005
                              • 5895
                              • Sweden
                              #8
                              Re: 13003 transistors...TO92?!?

                              Originally posted by eccerr0r
                              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."

                                Comment

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