Reading LCD Schematic details

Discussion in 'General Electronics Chat' started by Link068, May 10, 2018.

  1. Link068

    Thread Starter Member

    Apr 10, 2017
    31
    1
    Hi,

    I am about to make a foot print for an LCD but wanted to check first.
    upload_2018-5-11_8-16-18.png

    for connecting the 16 pins, correct me if I am wrong but the hole size is 1mm and the pad size is 2.54mm or less? and the spacing between each pad center is 38.1/16=2.38???

    While I am at it, what does PTH stand for?

    I know its simple but just want to double check.

    Cheers
     
  2. jpanhalt

    Expert

    Jan 18, 2008
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    PTH = plated through hole
    Pad width is 1.8 mm
    Hole size is as you say, 1.0 mm ( a standard 0.025" square pin fits nicely)
    Pitch between holes is 2.54 mm

    This:
    upload_2018-5-10_16-28-54.png
    Means 15 spaces (for 16 pins) = 38.1 mm
     
  3. MisterBill2

    Distinguished Member

    Jan 23, 2018
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    The item I see looks a lot more like a vacuum florescent display thing.
     
  4. jpanhalt

    Expert

    Jan 18, 2008
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    Are VFD's transmissive:
    upload_2018-5-10_17-40-51.png
     
  5. MisterBill2

    Distinguished Member

    Jan 23, 2018
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    Vacuum florescent displays generate light. Sort of like a neon tube, but a shade of blue.. They are hard glass and sort of fragile. And I may have read the drawing wrong.
     
  6. AnalogKid

    AAC Fanatic!

    Aug 1, 2013
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  7. MisterBill2

    Distinguished Member

    Jan 23, 2018
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    It is also important, when the spacing is that close, to have the solder mask on the edges of the copper, to avoid bridging. Solder bridges reduce the production yield.
     
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