Difference btw PWB and PCB

Discussion in 'Misc Electronics' started by Alex C, Aug 11, 2003.

  1. Alex C

    Alex C Guest

    Hi,

    Can anyone kind to tell me what's the difference btw PWB (printed Wiring
    Board) and PCB (printed Circuit board)?
    I can't find it in the net.... I heard some refer to PCB others said about
    PWB, but any difference(s)

    Thanks
     
    Alex C, Aug 11, 2003
    #1
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  2. "Alex C" <> wrote in message news:<bh8ahf$r3v$>...
    > Hi,
    >
    > Can anyone kind to tell me what's the difference btw PWB (printed Wiring
    > Board) and PCB (printed Circuit board)?
    > I can't find it in the net.... I heard some refer to PCB others said about
    > PWB, but any difference(s)
    >
    > Thanks


    They're the same thing.

    Harry C.
     
    Harry Conover, Aug 11, 2003
    #2
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  3. Alex C

    Blake Guest

    Alex C wrote:

    > Hi,
    >
    > Can anyone kind to tell me what's the difference btw PWB (printed Wiring
    > Board) and PCB (printed Circuit board)?
    > I can't find it in the net.... I heard some refer to PCB others said about
    > PWB, but any difference(s)



    As far as I can tell, if you've worked at TI you call it a PWB. Everyone
    else calls it a PCB.

    Blake
    --
    Drop 'pants' to reply by email
     
    Blake, Aug 11, 2003
    #3
  4. Alex C

    JeffM Guest

    >what's the difference btw PWB (printed Wiring Board)
    >and PCB (printed Circuit board)?
    >Alex C


    Depends on whom you ask.
    There is no industry-wide standard.

    I call a finished subassembly a PCB
    and a bare, unstuffed board a PWB.
     
    JeffM, Aug 11, 2003
    #4
  5. Alex C

    Fred Abse Guest

    On Mon, 11 Aug 2003 18:59:56 +0100, Harry Conover wrote:

    > They're the same thing.


    Not quite. At one time, printed circuit boards quite commonly used
    screen-printed-on components in addition to wiring, whilst printed wiring
    boards were just that - wiring.

    I remember Philco radios with printed resistors.

    The practice has now fallen into disuse, apart from circuits fired onto a
    ceramic substrate, and etched coils, so the two terms have become
    synonymous.

    I wonder if anyone here remembers (or has heard of) the "Tinkertoy"
    ceramic printed circuit assemblies of the 1940s?

    --
    Then there's duct tape ...
    (Garrison Keillor)
     
    Fred Abse, Aug 11, 2003
    #5
  6. Alex C

    Gary Tait Guest

    On Mon, 11 Aug 2003 21:40:42 +0100, Fred Abse
    <> wrote:

    >On Mon, 11 Aug 2003 18:59:56 +0100, Harry Conover wrote:
    >
    >> They're the same thing.

    >
    >Not quite. At one time, printed circuit boards quite commonly used
    >screen-printed-on components in addition to wiring, whilst printed wiring
    >boards were just that - wiring.
    >
    >I remember Philco radios with printed resistors.
    >


    I have some stereos from the 1980s (quite possibly made in the same
    plant), that have traces and resistors screened onto the component
    side of the board. I
     
    Gary Tait, Aug 11, 2003
    #6
  7. Alex C

    DarkMatter Guest

    On Mon, 11 Aug 2003 22:50:13 +0800, "Alex C"
    <> Gave us:

    >Hi,
    >
    >Can anyone kind to tell me what's the difference btw PWB (printed Wiring
    >Board) and PCB (printed Circuit board)?
    >I can't find it in the net.... I heard some refer to PCB others said about
    >PWB, but any difference(s)
    >
    >Thanks
    >



    They are one and the same. PWB is the old, archaic term, and PCB is
    the new current usage.
     
    DarkMatter, Aug 12, 2003
    #7
  8. Alex C

    DarkMatter Guest

    On Mon, 11 Aug 2003 18:06:30 GMT, Blake <> Gave
    us:

    >Alex C wrote:
    >
    >> Hi,
    >>
    >> Can anyone kind to tell me what's the difference btw PWB (printed Wiring
    >> Board) and PCB (printed Circuit board)?
    >> I can't find it in the net.... I heard some refer to PCB others said about
    >> PWB, but any difference(s)

    >
    >
    >As far as I can tell, if you've worked at TI you call it a PWB. Everyone
    >else calls it a PCB.
    >
    >


    There are several monikers. PWB PCB PWA CCA UUT, etc.

    Printed Wiring Board.

    Printed Circuit Board

    Printed Wiring Assembly

    Circuit Card Assembly

    Unit Under Test. (a stretch)
     
    DarkMatter, Aug 12, 2003
    #8
  9. Alex C

    DarkMatter Guest

    On 11 Aug 2003 13:13:02 -0700, (JeffM) Gave us:

    >>what's the difference btw PWB (printed Wiring Board)
    >>and PCB (printed Circuit board)?
    >>Alex C

    >
    >Depends on whom you ask.
    >There is no industry-wide standard.
    >
    >I call a finished subassembly a PCB
    >and a bare, unstuffed board a PWB.



    Sure there is. It is more about era than standards.

    When they were first introduced, they were referred to as Printed
    Wiring Assemblies, Or Printed Wiring Board(s). Once Printed Circuit
    Board came into vogue, the other is used primarily by old foggeys <sp>
    that are still entrenched in the past, or just to familiar with it to
    change, but these days, PCB is pretty much the accepted norm.
     
    DarkMatter, Aug 12, 2003
    #9
  10. Alex C

    Blake Guest

    DarkMatter wrote:

    >
    > There are several monikers. PWB PCB PWA CCA UUT, etc.
    >
    > Printed Wiring Board.
    >
    > Printed Circuit Board
    >
    > Printed Wiring Assembly
    >
    > Circuit Card Assembly
    >
    > Unit Under Test. (a stretch)


    Actually the "assembly" terms apply to the loaded boards, where the PCB/PWB
    apply only to the bare board.

    Blake

    --
    Drop 'pants' to reply by email
     
    Blake, Aug 12, 2003
    #10
  11. Alex C

    DarkMatter Guest

    On Tue, 12 Aug 2003 04:04:30 GMT, Blake <> Gave
    us:

    >Actually the "assembly" terms apply to the loaded boards, where the PCB/PWB
    >apply only to the bare board.



    Actually, contract manufacturers refer to assemblies as PCBs. Only
    those of us that actually do the developments of products make the
    distinctions you outline, and know the difference.

    All of the acronyms that have an "A" in them are obviously about
    loaded assemblies. Since they have military roots, it is unlikely
    that you will hear today's commercial contract houses using any of
    them. They jus' call 'em PCBs. Loaded or not. There has been a BIG
    relaxation in the industry. When I was learning it, ALL personnel on
    the lab floor had electronic training. Now we gotz idiot on the line
    that can't even read assembly drawing OR speak in the language of the
    country they are living and working in. Pretty sad, that.
     
    DarkMatter, Aug 12, 2003
    #11
  12. Alex C

    Fred Abse Guest

    On Mon, 11 Aug 2003 23:31:57 +0100, Gary Tait wrote:

    > I have some stereos from the 1980s (quite possibly made in the same
    > plant), that have traces and resistors screened onto the component side
    > of the board. I


    That's pretty late. I was thinking back to the '50's and '60s.

    Do that a lot these days. Sad isn't it?

    --
    Then there's duct tape ...
    (Garrison Keillor)
     
    Fred Abse, Aug 12, 2003
    #12
  13. Alex C

    DarkMatter Guest

    On Tue, 12 Aug 2003 22:30:12 +0100, Fred Abse
    <> Gave us:

    >That's pretty late. I was thinking back to the '50's and '60s.
    >
    >Do that a lot these days. Sad isn't it?



    Hell, back then, most of them were point to point wired!
    Hahahahahah...
     
    DarkMatter, Aug 13, 2003
    #13
  14. Alex C

    DarkMatter Guest

    On 13 Aug 2003 07:27:13 GMT, (AtPCLogic) Gave us:

    >
    >Read the latest magazines from IEEE, this is coming back because of a need to
    >reduce board size.


    Have you ever even seen an 0402 resistor? What about 0201? They
    are both in use... Today. ANY film screen process could not possibly
    control the value with repeatable enough results for it to be
    economical to do at those sizes, on the fly. Thousands of resistors
    get trimmed at one time on a chip manufacturing line, once the average
    slicing point is determined, then they get culled again after glazing
    for the one percent units Probing and laser trimming on a custom PCB
    AIN'T cheap. I doubt that you'll be beating the 0402 or 0201 form
    factors any time soon. Both for automated assembly reasons, AND
    precision.

    So... what exactly is "coming back"?
     
    DarkMatter, Aug 13, 2003
    #14
  15. Alex C

    DarkMatter Guest

    On Wed, 13 Aug 2003 10:56:43 +0200, Jean-Michel Friedt
    <> Gave us:

    >
    >When I visited Georgia Tech 3 years ago they had a whole department
    >working on the development of methods for integrating passive components
    >in the layers of PCB for hi-density hi-frequency boards.



    Still a ways off as far as a low cost, high volume, quick turn
    manufacturing process, however.
     
    DarkMatter, Aug 13, 2003
    #15
  16. Alex C

    Blake Guest

    DarkMatter wrote:

    >
    >>Actually the "assembly" terms apply to the loaded boards, where the
    >>PCB/PWB apply only to the bare board.

    >
    >
    > Actually, contract manufacturers refer to assemblies as PCBs. Only
    > those of us that actually do the developments of products make the
    > distinctions you outline, and know the difference.


    Pretty funny, I read my reply later and thought that the "actually" sounded
    pretty authoritative, and I was only guessing. Oh well. The hazards of
    being a know-it-all.

    Blake


    --
    Drop 'pants' to reply by email
     
    Blake, Aug 13, 2003
    #16
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