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How to select DIP socket?

Discussion in 'Electronic Basics' started by mooseo, Mar 6, 2006.

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  1. mooseo

    mooseo Guest

    Hi,
    I'm looking to order some DIP sockets for a project. In the past, I've
    never really used these in the past, and a quick search on Digikey is
    giving me a dizzying assortment of brands and options. Because this is
    a one-off project, I don't really care whether the sockets cost me $1
    or $3...

    Can anyone give me suggestions of the really important features to look
    for? Do people just have a favorite socket that they always keep
    around?

    Thanks,

    Mike
     
  2. Chris

    Chris Guest

    Hi, Mike. The primary considerations are the integrity of the socket
    connection and the physical dimensions.

    Least expensive (and least reliable contact) is single-leaf. Better is
    double-leaf (the two leaves press against each other through the pin,
    and there's twice the contact surface), and best is the collet pin.
    Relative increases in price throughout.

    If you want wire wrap, you choose that socket accordingly (more layers
    equals longer leads and more expense -- most people choose 3-layer).

    Some DIP sockets are made for minimum height (avoid those if you can --
    usually there's only room for lower quality single-leaf contacts).
    Some are also made with built-in bypass caps (these are made for DIP
    logic ICs). I guess if you're desparate, those are OK, but if you have
    good layout practices, it's just an expensive way to add a cap.

    Of course, there's a difference between brand name sockets and
    generics. This is a part that you'll never test the quality, and any
    failure is usually down the line, but the intermittents from poor IC
    sockets are the bane of repair people everywhere.

    You plays the game, you takes your chances. Always choose the socket
    your project deserves.

    Hope this has been of help.

    Good luck
    Chris
     
  3. Andrew Holme

    Andrew Holme Guest

    "Turned Pin" sockets are high quality.
     
  4. John Fields

    John Fields Guest

    ---
    Negatory!

    There are high-rel sockets made with machined contacts (and
    individual sockets which can be inserted into perfboard) which can
    provide the ultimate minimum in above-board height and contact
    resistance for other than a soldered joint, and if that's what's
    important, that's the way to go.
    ---
    ---
    The bane?

    Hardly. That's how they make their living.

    No sockets, no intermittents, no supper for the kids...
    ---
     
  5. Ben Jackson

    Ben Jackson Guest

    If you etch your own boards, turned pin sockets are very nice because you
    can easily solder the pins on the top side as well as the bottom.

    For proto boards, especially with big chips, spring for a ZIF socket.
    I think DIP40 ZIF can be had for about $7 and it's worth every penny.

    For PLCC sockets beware that there are surface mount versions of the
    socket as well as through-hole.
     
  6. Chris

    Chris Guest

    Amen, and amen again to almost every statement above. However, in a
    world of one-offs, engineering prototypes, and electronic
    improbabilities, a transistor or IC may be pushed far beyond what would
    be considered good conservative practice or has to occasionally undergo
    stresses beyond design. Many times your offspring is one board that's
    supposed to solve one problem on one process in one factory. For these
    fugly but workable solutions (and factory floors are full of them),
    sockets _do_ exist, and do have a (somewhat ignoble) purpose. As do
    the technicians who repair these offspring, and keep the instruments
    and machines running. Let's be fair to them, good sir. If none of the
    fuglies ever had to be repaired, they'd still be running around with
    their hair on fire just trying to keep up with the rest of their jobs.

    But for production electronics, yes -- IC sockets are so '80s.

    Thanks for the spot as always, Mr. Fields.

    Cheers
    Chris
     
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