The annular ring is etched in, typically. It is not usually a buildup.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jeffrey Bush
Sent: Wednesday, December 28, 2005 1:30 PM
To: [log in to unmask]
Subject: Re: [TN] supported vs unsupported
So, if I have a hole that is non-plated, but has a pad, it is supported,
rather than non-supported and the .002" annular ring requirement (Class
3) applies? Then an unsupported hole, which has no plating and no pad
has an annular ring requirement (Class 3) of .005"? Where will the
annular ring come from?
The support is the plating in the barrel.
Jeffrey Bush
Director, Quality Assurance and Technical Support VERMONT CIRCUITS
INCORPORATED
76 Technology Drive - POB 1890
Brattleboro, Vermont 05302
Voice - 802.257.4571 ext 37
Fax - 802.257.0011
<http://www.vtcircuits.com/>
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of mattyk
Sent: Wednesday, December 28, 2005 2:25 PM
To: [log in to unmask]
Subject: Re: [TN] supported vs unsupported
A non-plated hole can be a supported hole.
i.e. a non-plated hole with pads or a copper ring around the hole.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jeffrey Bush
Sent: Wednesday, December 28, 2005 2:16 PM
To: [log in to unmask]
Subject: Re: [TN] supported vs unsupported
The support is the barrel. Plated holes are supported and non-plated
holes are unsupported.
Jeffrey Bush
Director, Quality Assurance and Technical Support VERMONT CIRCUITS
INCORPORATED
76 Technology Drive - POB 1890
Brattleboro, Vermont 05302
Voice - 802.257.4571 ext 37
Fax - 802.257.0011
<http://www.vtcircuits.com/>
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Babcock John
Sent: Wednesday, December 28, 2005 1:09 PM
To: [log in to unmask]
Subject: [TN] supported vs unsupported
In IPC-A-600 it talks about minimums for external annular rings...but I
cannot find a definition for supported or unsupported holes.
What is the difference? Does supported have a trace attached?
John
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