×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

general tolerance of a PCB, both of FR4 and metal core

general tolerance of a PCB, both of FR4 and metal core

general tolerance of a PCB, both of FR4 and metal core

(OP)
Hi all,
Can someone shed some light on this for me.
Q: what's the general tolerance (pad size, distances, picthing..etc) of a Gerber file converetd PCB, both of FR4 and metal core type?
Many thanks!

Best regards,
ct

RE: general tolerance of a PCB, both of FR4 and metal core

I'm not sure the question makes a lot of sense... the tolerance is whatever the manufacturer is able to achieve above the specs you set.  I could make an FR4 board with tolerances on pad sizes of 100 mils using a permanent marker and an etch tank, but a board house might have a tolerance of 1 mil.

Dan - Owner
http://www.Hi-TecDesigns.com

RE: general tolerance of a PCB, both of FR4 and metal core

You need to talk to several PCB manufacturers. Many have on their web sites a list of general specs for trace/space, minimum hole size, etc. But these guidelines can be exceeded for additional cost and lower yield.

RE: general tolerance of a PCB, both of FR4 and metal core

Moreover, tolerances of finished parts are a function of the process control imposed by the manufacturer.  I, doing parts in my garage, will have a different level of process control compared to a commercial shop.

If you're asking what the state of the art is, look at a high-end video card like an Nvidia Ge 7 series board:
http://www.nvidia.com/page/geforce_7950.html

It's got a 1GB memory with 512-bit effective memory I/O

TTFN



Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources