For external layers, the minimum spacing for uncoated leads is 1.25mm, but
for coated leads it is .4mm. I'm sure someone here can suggest a good
permanent polymer coating. Also, if you can route a slot between the pins,
the numbers will change in your favor, but I'm not sure by how much.

David Ricketts

Pertek Engineering
Voice: 949-475-4485
Fax:   949-475-4493

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of d. terstegge
Sent: Monday, November 26, 2001 7:46 AM
To: [log in to unmask]
Subject: [TN] Isolation between connector pins


Hi Technetters,

On one of our new designs must be able to withstand a 220 Volt AC between
two pins of a SMD-connector with a spacing between the pins of about 0.5 mm.
This seems a bit on the critical side, and the designer asked me if it is
possible to have some extra isolation between these pins. I was thinking
that a drop of solderresist that we sometimes use for repairs would do the
job, but I'm not sure that it'll work. Maybe someone can give me a better
advice ?

Daan Terstegge
SMT Centre
Thales Communications
Unclassified mail
Personal Website: http://www.smtinfo.net

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