Richard,

If you specify a plating thickness for PTH holes, that thickness will apply
across the whole board, as I'm sure you realise, unless you opt for
selective plating, which is more expensive. Plating thickness, or rather
x-sectional area, should be designed to cater for your current carrying
requirements, plus remember that plated holes have a capacitance effect, so
you have to ensure that your clearances between the hole and the adjacent
copper features in enough to prevent interference.

Have you sectioned any of the boards that are giving you trouble to assure
yourselves that you're not suffering from drill smear and/or poor plating
connection to the ground plane?

2 cents worth (all I can afford after the Christmas shopping).

Peter



Richard Brennan <[log in to unmask]>   20/12/2002 12:43 AM
Sent by: TechNet <[log in to unmask]>

Please respond to "TechNet E-Mail Forum."; Please respond to Richard
Brennan

              To:  [log in to unmask]
              cc:  (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group)
              Subject: [TN] Plated Through Holes








Hi everyone
Can anyone tell me what the recommended thickness of the barrels of PTH's
is?
We have a minor problem with 0.4mm dia. barrels not giving good ground from
top of board to ground plane on underside.
Boards are double sided PTFE / copper track / Emersion tin RF boards.

Richard Brennan
Manufacturing Support Manager
Health & Safety Manager
Aerial Facilities Ltd
Aerial House
Asheridge Road
Chesham
Bucks
HP5 2QD
01494 777000
Direct line
01494 777052

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