Sender: |
|
X-To: |
|
Date: |
Wed, 4 Mar 2009 07:33:31 -0500 |
MIME-version: |
1.0 |
Reply-To: |
|
Content-type: |
text/plain; charset=iso-8859-1 |
Subject: |
|
From: |
|
In-Reply-To: |
|
Content-transfer-encoding: |
quoted-printable |
Parts/Attachments: |
|
|
Table 6-1 in IPC-2221 will provide you with the minimum electrical clearance, use the numbers from the B1 column for internal layers for the "A" factor. The "B" factor should be defined for m table 9-1 of IPC-2222 based on design complexity and maximum dimensions. Based on fabricator requirements this should give you a distance of greater than or equal to 0.25mm [0.010"].
Jeffrey A McGlaughlin, CID
Engineering Designer
Battelle
505 King Ave
Columbus Ohio 43201-2693
Phone (614)424-7582
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of GRIVON Arnaud
Sent: Wednesday, March 04, 2009 5:38 AM
To: [log in to unmask]
Subject: [TN] PTV to Ground Clearance
Hello TechNet,
For those who are familiar with IPC-2221 and IPC-2222 standards : what are
the recommended clearances between a PTV/PTH and an internal PCB ground
plane?
IPC-2222 §9.1.3 'Clearance area in plane' includes a picture with an 'A+B'
distance corresponding to the summation of the electrical clearance and the
manufacturing tolerances, but I cannot find any numerical values.
Can somebody help?
I am primarily interested in the case of an unsupported hole without NFP in a
ground plane.
Thanks in advance for your insights.
Best regards,
A. Grivon
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
|
|