Need help identifying transistor base

Discussion in 'DIY' started by kaplang, Feb 14, 2018.

  1. kaplang

    kaplang Works for me ! Subscriber

    Messages:
    3,331
    Location:
    34.0500° N, 118.2500° W
    Transistor in the picture is a 2SC458. The picture on the spec sheet shows a different shaped transistor with pin 3 being the base. Does the red arrow I show point to the base of my transistor? It has the flat side with the transistor number C458 showing. The other side is not flat and has the letters LG in a circle and the letter E in a circle. I just want to be sure.

    Thanks for any help.

    George
    62FA5ED9-93C1-4727-BBD6-93691CB03642.jpeg
     

    Attached Files:

  2. Hyperion

    Hyperion Roobarb & Custard Subscriber

    Messages:
    42,005
    Location:
    Hertfordshire, UK
    Yep, looks right to me.
     
  3. I LIKE MUSIC

    I LIKE MUSIC Super Member

    This is one of the transistors that can lead (see what I did there) to confusion.

    One variety has the printing on the front and one variety has the printing on the back.

    upload_2018-2-14_14-23-41.png
     
    slimecity and mbz like this.
  4. stoN_Cold

    stoN_Cold Super Member

    Messages:
    2,780
    Location:
    Belgrade, Serbia
    Genuine old Hitachi.

    [​IMG]
     
  5. mbz

    mbz AK Subscriber Subscriber

    Messages:
    1,481
    Location:
    Melbourne, Victoria
    Second the confusion caused by the printing being on the back of the outhouse shaped item.
    Pinout is ecb, bevel face is front, printing on back/larger face.
     
  6. Hyperion

    Hyperion Roobarb & Custard Subscriber

    Messages:
    42,005
    Location:
    Hertfordshire, UK
    The pictures above on posts #3 & #4 are the 'little outhouse' package variety.

    To confirm, I recommend measuring the transistor in question with a transistor tester or multimeter on 'diode test' range.
     
    slimecity and sregor like this.
  7. stoN_Cold

    stoN_Cold Super Member

    Messages:
    2,780
    Location:
    Belgrade, Serbia
    One and only. :rockon:
     
  8. kaplang

    kaplang Works for me ! Subscriber

    Messages:
    3,331
    Location:
    34.0500° N, 118.2500° W
    Thank you all.
    Really helps me in hopefully repairing my Akai GX365 reel to reel.
     
  9. sregor

    sregor AK Subscriber Subscriber

    Messages:
    3,250
    Location:
    Mass
    +1 on this. Takes 30 seconds and can save your sanity. I like to verify base, then kink it or separate it slightly from the rest.
     
  10. slimecity

    slimecity Super Member

    Messages:
    2,163
    Location:
    New Zealand
  11. jeromach

    jeromach With sufficient thrust, ducks fly just fine

    Messages:
    1,077
    Location:
    O<erveen, the Netherlands
    Ah, fun, to see my picture here :). It comes from; http://audiokarma.org/forums/index....prone-whatever-and-replacements.731653/page-3

    I made it once to outline the difference between these two transistors, they are common in Akai gear, but also in some Marantz and Luxman amps.

    The BCE transistor is a SOT-33 package, the ECB transistor a TO-92. All SOT-33 transistors have BCE pinout seen from the side where the model # is printed on.
     
  12. gslikker

    gslikker Super Member

    Messages:
    1,841
    Location:
    Close to Alkmaar, Netherlands
    Hi Jeroen , to add to the pinout confusion, I can not resist putting following picture as "Leisure".

    I have several of these OC22 which most probably come from the Philips factory, they have the base and emitter markings wrong and they put an X through it.....(One has good marking orientation but it is not an OC22).

    ;)

    transistor.jpg
     
  13. jeromach

    jeromach With sufficient thrust, ducks fly just fine

    Messages:
    1,077
    Location:
    O<erveen, the Netherlands
    Fun :)

    Someone in that factory had a problem at a sudden moment...
     

Share This Page