We always use square pads and for electolytic caps a + sign.  Diodes (and Leds)
always have symbols on the silkscreen and the cathode is a square pad.

Bob Landman
H&L

----- Original Message -----
From: Matthias Mansfeld <[log in to unmask]>
To: <[log in to unmask]>
Sent: July 07, 1999 12:08 PM
Subject: [DC] Standard for polarized THT components?


> Hello all,
>
> is there any standard for marking the polarity for THT components,
> like electrolytic components, if there is no silk screen with a
> thick, white kathode bar?
> I know ICs have often round pads, and number 1 is square, but how do
> you handle diodes, tantal caps etc.? a small + or - sign in the
> copper near the pin, or one pad (which one: 1, 2, +, - ?) square, the
> other round?
>
> Thanx, regards
> Matthias Mansfeld
> -----------------------------------------------
> Matthias Mansfeld Elektronik
> * Printed Circuit Board Design and Assembly
> Am Langhoelzl 11, D-85540 Haar, GERMANY
> Phone: +49-89-4620 0937, Fax: +49-89-4620 0938
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>