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right-angle card-edge connector

Discussion in 'Electronic Components' started by Mochuelo, Jun 3, 2006.

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  1. Mochuelo

    Mochuelo Guest

    Hi,

    I need a very cheap (ideally below 0.8 EUR (1 k units)) right-angle
    card-edge connector with 8 or 10 positions. Rating: 24 V, 0.1 A per
    pin. Contact spacing is not critical. Any recommendation?

    Thanks in advance,
     
  2. Pooh Bear

    Pooh Bear Guest

    Yes. Never use a pcb as part of your connection. Use a 2 part connector.

    Next question ?

    Graham
     
  3. Mochuelo

    Mochuelo Guest

    Tell that to the manufacturers of DIMM, SIMM, RIMM, AGP, PCI, PCI
    Express, ISA...
     
  4. Pooh Bear

    Pooh Bear Guest

    Which is precisely why 'reseating' a card is so popular. Edge connectors are
    used because they're cheap not because they're reliable.

    Is this an application where reliability doesn't matter ?

    Graham
     
  5. Ross Herbert

    Ross Herbert Guest

    I would dispute that statement. In my experience use of card edge
    connectors is much more expensive than using two part connectors,
    mainly because they are more labour intensive to produce and require
    plating (usually with gold). The reason they are used on DIMM etc is
    because they require far less board space and they are very reliable.
     
  6. Pooh Bear

    Pooh Bear Guest

    I'm sure this isn't true of PC motherboards etc.
    The ones used for DIMM SIMM etc at least have a locking mechanism. There are
    issues wrt whether the contacts are tin or gold plated though.

    Graham
     
  7. Ross Herbert

    Ross Herbert Guest

    What do you mean??

    It is many years since any computer motherboard used edge connectors
    so how does this apply to PC's which never used them?
    What makes edge connectors more expensive (whether tin or gold plated)
    is the fact that the edge connector must be formed as part of the pcb
    manufacturing process. Once etched, the edge connector part is then
    electrolytically plated and the commoning strip used to connect the
    pads (for electroplating) is then trimmed off during drilling and
    routing and then chamfered. The board handling and processing is thus
    made so much more expensive compared to using modern two part
    connectors. That's the main reason this process isn't used today,
    except in certain circumstances. It was not so much a question of
    reliability because they were at least as reliable as two part
    connectors.

    I have found the variation in pin dimensions and receptacle tensioning
    on some very reputable two part connectors to be quite variable such
    that the reliability from batch to batch was quite poor. At least with
    pcb card edge connectors the board and copper thickness was fairly
    standard and only the socket manufacturing could be variable thus
    reducing the probability of poor reliability of connection due to
    manufacturing defects and errors by 50%.

    Ross H
     
  8. Ross Herbert

    Ross Herbert Guest

    Duh - oh....
    It seems that we are going off at a tangent anyway... On re-reading
    the OP's initial request, it appears he is NOT referring to an etched
    and plated card edge connector at all, so what we are saying is
    irrelevant. It seems he may in fact have been asking for
    recommendations for a two part RIGHT ANGLE CONNECTOR for mounting on
    THE EDGE of the pcb.
     
  9. Mochuelo

    Mochuelo Guest

    No, I'm looking for a right-angle card-edge connector (so, one part).
    I finally need 12 contacts, in dual row (6+6). Tin plating on the pcb
    edge contacts is more than enough, since there will be no vibrations,
    no mechanical stress, and 2 or 3 insertion cycles in total. These
    things are pretty expensive, compared to some two-part pieces. I can't
    find anything for less than 1.2 .. 1.5 EUR (in 1 k).

    Thanks,
     
  10. Pooh Bear

    Pooh Bear Guest

    Vibration comes from lots of sources. Nothing is ever likely to be entirely
    vibration free.
    Maybe because no-one in their right mind uses them any more.

    I do hope you're not passing any analogue signals through this connection. I
    also highly recomment reconsidering your connection method.

    Graham
     
  11. Mochuelo

    Mochuelo Guest

    In your previous post you said "edge connectors are used because
    they're cheap," and now you try to justify why they are expensive.
    This is good.

    "No-one in their right mind uses them any more." You mean that the
    manufacturers of DIMM, SIMM, RIMM, AGP, PCI and PCI Express are out of
    their minds? This is even better. Who do you think you are, Graham?

    Maybe you are just angry because I didn't take your recommendation.
    Why should I have? You have provided no supporting data, and have
    shown to have quite a mess in your mind. If you can't help, that's ok,
    but don't bother.
     
  12. Pooh Bear

    Pooh Bear Guest

    I've never said they were expensive. You have. I simply commented that there's
    little demand for them aside from PCs, so as they aren't very popular as an
    industrial connector you can expect to pay accordingly.

    In large quantities for PC motherboards I bet they are dead cheap. Consider what
    any alternative with that many contacts would cost at the small quantities you're
    talking about. For comparison's sake some older Macs used DIN41612 dual row 64
    pin connectors. Work out how much that would cost for a typical mobo.
    They are used because PC mobos have always used edge connectors for the same
    reasoning. They're cheap. The cost of gold plating the pcb contacts is minute
    compared to the other half of a 2 part connector too.

    If you want to screw up your project that's fine by me. I do have plenty of
    experience of their failings though. I can't even remember now how many times a
    fix has involved 'reseating the card' !

    I also know what they do to analogue sigals as well. One reason that audio gear
    dropped using edge connectors about 30 yrs ago ! You can hear the effect.

    Graham
     
  13. Mochuelo

    Mochuelo Guest

    Pooh Bear : "Edge connectors ARE USED because they're cheap."
    Pooh Bear : "Maybe because NO-ONE in their right mind USES THEM any
    more."

    .... ARE USED...

    .... NO-ONE USES THEM...

    Can you see at least this contradiction?
    If the answer differs from "yes," good luck.
     
  14. Pooh Bear

    Pooh Bear Guest

    You'ver had it explained. I wouldn't use a connector that's known to be
    troublesome in its best known application, the PC motherboard.

    Please go ahead and use it but don't come back here bleating about your woes in
    a few months time.

    Graham
     
  15. Pooh Bear

    Pooh Bear Guest

    In a PC motherboard application.
    They're expensive and difficult to find for anything other than a mobo
    application precisely because they're not popular for *anything else* !

    Maybe you should stop to give some consideration *why* they aren't popular any
    more btw. And why PCs often need 'the boards reseated'.

    If you can't see the logic in that then god help you.

    Graham
     
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