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choice between 0805 or 0603 ?

Discussion in 'Electronic Design' started by Adam S, May 17, 2007.

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  1. Adam S

    Adam S Guest

    When PCB space is not a constraint and volumes are low ( <= 1000 units
    year), what is the most popular SMD package size these days for passives ?
    It seems high volume manufactures all go for 0603. I assume the reason
    is sizes below 0603 can give rise to potential problems during assembly
    and sizes above 0603 are more expensive.
     
  2. Paul Burke

    Paul Burke Guest

    I suppose my stuff is in that category. I've gone to 0603 for space
    reasons on a few boards, and my board stuffer finds it possible to work
    with- though he prefers 0805. He screamed when I suggested 0402. He
    assembles mostly by hand BTW. So I tend to use 0603 for everything new,
    on the grounds that eventually we'll only have to stock one size.
     
  3. Jeff L

    Jeff L Guest

    That is correct. 0603 is cheapest, and easier to work with then 0402 and
    smaller.
     

  4. In the volumes you're using, with no space constraints, the 0805 is usually
    a better solution. Yes, they are marginally more expensive, and use a little
    more paste (serious considerations for large volume assembly), but the
    larger parts have fewer assembly problems and will handle a little more
    power. Rework is easier (therefore cheaper), and visual inspection is easier
    (therefore more accurate). 0805 parts are marked with the resistance, 0603
    usually are not.

    Digikey shows a 5k spool of 0603 1% resistors at $36.75, and a 5k spool of
    0805 1% resistors at $39.00.

    Chris
     
  5. PeteS

    PeteS Guest

    Depends on what you need. If you have high speed signals flying about
    then 0402 devices have significantly lower parasitics (and are
    comparable in cost to 0603 when board space is taken into account). If
    you have something where that's not an issue then 0603 is currently the
    cheapest solution. That will probably change fairly soon though as 0402
    parts become the 'standard' part.

    Cheers

    PeteS
     
  6. colin

    colin Guest

    0805 is most convenient size for me to use with home made pcbs.
    and its still possible to read those resistor number codes.

    although I have used 0603, only cos I didnt realise how small they were to
    start with.

    Colin =^.^=
     
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