TIP 31 A equivalent

Discussion in 'The Projects Forum' started by The Engineer, Mar 24, 2015.

  1. The Engineer

    Thread Starter Member

    Sep 3, 2014
    35
    1
    I'm am about to print out a PCB in order to build a metal detector , here is the design. http://www.geotech1.com/pages/metdet/projects/twinloop/twinloop.pdf
    I am missing a transistor, a TIP31A.
    Have looked in a alternative transistor catalogue and have found no results for this component, So I am wondering if anybody on the forum knows of any possible alternatives that will just about to the job ?
    Need to hand the detector in in two days so any advice will be very helpful !
    Thanks guys.
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    If you can't buy, what numbers do you have or get ?
     
  3. The Engineer

    Thread Starter Member

    Sep 3, 2014
    35
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    I have 32C, 34, 41, 120, 121, 126, 127, 3055. And many other transistors available as i'm in college so name any you believe will work !
     
  4. Jim Brooks

    New Member

    May 19, 2014
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  5. The Engineer

    Thread Starter Member

    Sep 3, 2014
    35
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    I do not have time to order unfortunately ! if you could name any you belive will work I will check if they are in the store room
     
  6. MCU88

    Member

    Mar 12, 2015
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    Why don't you read the datasheets yourself and see if you have an equivalent. Things to consider with comparison would be:
    • NPN or PNP?
    • hFE / Beta
    • Darlington / super transistor?
    • Bandwidth (MHz)
    • Voltage & current ratings
     
  7. MrChips

    Moderator

    Oct 2, 2009
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    TIP41
     
  8. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,967
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    Tip41
     
    Last edited: Mar 25, 2015
  9. AnalogKid

    Distinguished Member

    Aug 1, 2013
    4,515
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    TIP41 - yes. 5A instead of 3A, simple substitution.

    TIP121 - no. This is a darlington transistor, and might not behave the same as the TIP31 because of the different effective base-emitter voltage.

    ak
     
    atferrari likes this.
  10. tonyStewart

    New Member

    May 8, 2012
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