1. Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
    Dismiss Notice

zener tolerance effect..

Discussion in 'General Electronics Chat' started by jaikanth, May 28, 2005.

  1. jaikanth

    jaikanth New Member

    Joined:
    Mar 6, 2004
    Messages:
    19
    Likes:
    0
    Location:
    Mumbai
    :roll:
    hi,

    i'm having an electronic module that consists of zener diode (30v,2%BZV55B30V MINIMUM).
    Ii i replace this diode with same spec but 5%,then what will happen?
    both are working fine but in which condition it will give problem if i put 5% instead of 2%?

    thanks.............
     
  2. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

    Joined:
    Nov 17, 2003
    Messages:
    39,324
    Likes:
    653
    Location:
    Derbyshire, UK
    It depends entirely on the application, there might not be any reason for a 2% zener being specified anyway, and the zener you fitted may well be within the 2%!.

    If it bothers you, measure the voltage across it, and see if it's within 2% of 30V.
     
  3. Oznog

    Oznog Active Member

    Joined:
    Apr 21, 2004
    Messages:
    2,879
    Likes:
    11
    Location:
    Austin, Tx
    A 2% Zener isn't the most common type, so just off the top of my head I suspect they went out of the way to select that one because the circuit does require a tighter tolerance.
     
  4. dave

    Dave New Member

    Joined:
    Jan 12, 1997
    Messages:
    -
    Likes:
    0


     
  5. Dean Huster

    Dean Huster Well-Known Member

    Joined:
    Feb 1, 2003
    Messages:
    1,203
    Likes:
    29
    Location:
    Harviell MO USA

    That tolerance applies to the intitial "guaranteed" zener voltage at a specified current. In all likelihood, both the 5% and the 2% parts will "hold" their voltage equally as well with regard to again. As mentioned, if the voltage measures within the 2% margin, I'd go ahead and use the 5% part.

    It might be that the 2% part is also temperature-compensated by placing another diode internally in series. These types of zeners don't have a "forward" conducting curve but appear as open.

    Dean
     

Share This Page