Transistor package colours

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  • japlytic
    Badcaps Legend
    • Oct 2005
    • 2086
    • Australia

    #1

    Transistor package colours

    Some Japanese manufacturers use green coloured encapsulation for PNP transistors, whereas NPN transistors are normally black (some older transistors had grey encapsulation).
    The above mainly affects transistors in a TO-126 or larger package.

    I have seen blue 2SD386A(Y) transistors from 1977 - what does the blue colouring of the encapsulation mean?
    My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.
  • PeteS in CA
    Badcaps Legend
    • Aug 2005
    • 3576
    • USA, Unsure of Planet

    #2
    Re: Transistor package colours

    Hmmm ... all the plastic package transistors I've seen were Model T-colored ("Any color you want as long as it's black"). W/O looking for a datasheet ... could it be a darlington or a JFET?
    PeteS in CA

    Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
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    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: Transistor package colours

      I have seen and used Japanese transistor with Green, red, blue casing on TO-220. I do not think it means anything since the same one manufaturer will use the color they want to differentiate it from other manufacturer even thoug it has the same P/N as the other manufacturers .
      Never stop learning
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      • kc8adu
        Super Moderator
        • Nov 2003
        • 8832
        • U.S.A!

        #4
        Re: Transistor package colours

        i remember some nec 2sc1307 in red cases.
        bought the bag of 500 at a surplus dealer.
        i tested them and they had about 3db more gain than others i had seen.
        these average about 12db.some of the red ones were 16.
        special run for an oem?
        this was when cb was hot.these are used in final stage of ssb cb's.

        Comment

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