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In terms of PCB, what is meaning of PTH and non-PTH

Discussion in 'Circuit Simulation & PCB Design' started by rushi53, Aug 26, 2010.

  1. rushi53

    rushi53 Member

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    Hi,

    I went to PCB manufacturer for my double sided PCB.

    He asked me whether I want it PTH and non-PTH.

    I wanted to know the meaning of PTH boards.

    Does it make any difference in terms of soldering or assembling the components.

    Please guide me....
     
  2. ericgibbs

    ericgibbs Well-Known Member Most Helpful Member

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    hi,
    PTH means plated thru holes, the track on opposite faces of the PCB are connected by copper track,
    For non PTH, you have to use wire link thru's
     
  3. PCBWING

    PCBWING New Member

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    Hole with metal can be connected up and down both sides, called the PTH.
     
  4. dave

    Dave New Member

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  5. BrightPCB

    BrightPCB New Member

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    If you don't need the hole to connect the sides, better don't set it as a PTH, this will save material and process.
     
  6. JonSea

    JonSea Well-Known Member

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    Most (low cost at least) fab houses make holes plated unless directed otherwise (and sometimes at extra cost for non-plated holes). The plating in the hole depends on the copper layers on each side to anchor it in place, particularly during the fabrication process. If a hole is plated without a pad on each side, the plating can come loose during processing and end up shorting tracks together on the finished board.

    Holes are plated to make a connection between the copper layers and to allow a better solder connection to be made.

    Where would you want non-plated holes? Board mounting holes might be non-plated, as might mounting holes for switches.

    Board fab houses may want a Gerber layer called NPTH to identify non-plated holes. These holes are physically plugged when holes are plated. It's an extra step in the boards making process.
     
  7. Ian Rogers

    Ian Rogers Super Moderator Most Helpful Member

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    Er!! 6 year old thread!! OP hasn't been here for 3 years..
     
  8. JonSea

    JonSea Well-Known Member

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    Oops, sorry. BrightPCB seems to be looking for places to post....
     

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