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T O P I C    R E V I E W
halcyonrichard Posted - 04 Sep 2025 : 13:18:39
Hi I have been asked by a customer to place a circular plated through pad on the edge of the PCB. i.e. the board outline will cut through the pad and only one half of it will remain. He wants to do this to solder wires to the edge of the PCB. Is it possible to do this ? Has anyone done a similar thing ?

Richard


Richard
4   L A T E S T    R E P L I E S    (Newest First)
halcyonrichard Posted - 04 Sep 2025 : 17:25:27
quote:
Originally posted by Peter Johnson

All very valid, but you CAN use a semicircular pad. Set the pad style to use 'Offset Bullet' then make the length half the width. That's not normally allowed but this case is a special one. You'll end up with a semicircular pad so it needn't overlap the board edge.

Thanks Peter your a star that works a treat.

Richard
edrees Posted - 04 Sep 2025 : 14:29:50
Very sneeky Peter! Leant something new today again!
Peter Johnson Posted - 04 Sep 2025 : 14:25:11
All very valid, but you CAN use a semicircular pad. Set the pad style to use 'Offset Bullet' then make the length half the width. That's not normally allowed but this case is a special one. You'll end up with a semicircular pad so it needn't overlap the board edge.
edrees Posted - 04 Sep 2025 : 13:53:12
Yes, been there, got the T shirt & hat.

Just place the thru-plated hole on the edge of the pcb outline, but tell your manufacturer that it is a Castellated hole just to make sure.
Some Chinese proto pcb companies will, unfortunately, throw it out as an error.

Make sure that the pad is big enough as the pcb profile router bit can tear the plating away on anything smaller than say a 1.1mm pad diam. & 0.8mm diam. hole.