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Oddball Transistor

Discussion in 'Electronic Components' started by Watson A.Name - \Watt Sun, the Dark Remover\, Jun 26, 2004.

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  1. I pulled an odd transistor off a board and altho I had never heard of
    that alphanumeric designation before, by googling for it, I found it
    easily on the ON Semi website. The transistor is the LA733P, and from
    the specs it seems like just an ordinary PNP transistor, nothing special
    about it. The board has numerous H 945 transistors which are the
    generic 2SC945 clones. If this transistor is so ordinary, it seems odd
    that the designers wouldn't just use another PNP version of the '945
    instead. I think one choice would be the 'not uncommon' 2SB838.
    http://www.datasheetarchive.com/cgi-bin/q.php?pi=33099

    Then I got to thinking about it, and the thought occurred to me that ON
    might be playing the Fairchild game where they change the letters at the
    beginning, like the 2SA Japanese letters are changed to KSA. So I
    compared the specs of the 2SA733 with the LA733P, and I found that since
    they're both small signal transistors, the specs aren't all that much
    different, but then they're not all that much the same either. For
    instance, the 2SA is 250mW and 125 degrees, whereas the LA is 625mW and
    150 degrees. So the jury is still out on whether or not they're
    equivalent.

    The datasheets can be found at the above URL. Thanks for any comments.


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