A PCB Design Potpourri


Reading time ( words)

In this column, I will be revisiting topics covered in some of my older columns and fleshing them out with new, updated information. In this job, I truly learn something every day, and I’m happy to share a few notable nuggets with you.

The Quote Process

Ultimately, whether it’s a quick-turn or standard lead-time job, customers would like to see all quotes back within a couple of hours, not a couple of days. Additionally, they want to see accurate quotes that take into account all additional processes. It’s never good when, once quoted, the fabricator comes back with additional costs for unforeseen processes. Again, this is why it is important to get a manufacturing review done if anything outside the norm is required on the drawing or quote. This includes a proper review of impedances to ensure that materials are available and the impedances work without requiring large variances in dielectric or line sizes, buy-offs for any deviations of material type or copper weights, etc.

Beyond the quote process, be sure that your fabricator is capable of all the processes necessary to ensure the board is built as expected. You want your board shop to be IPC-6012 Class 3 capable and ISO certified, and perhaps ITAR as well. Even if you can’t visit the shop for a physical qualification, send them a job to quote and see how they respond. A good fabricator will be diligent and get back to you within a few hours after completing a preliminary examination of the files, impedance calculations and proposed stackup if the board is impedance/dielectrically controlled. They should also be able to let you know right away if the job does not meet their process minimums and can’t be built. If deviations are allowed, a good fabricator will also have an alternative for many situations, such as a deviation for material type, starting copper weight, dielectrics or line sizes to be able to produce the job.

Read the full column here.


Editor's Note: This column originally appeared in the July 2013 issue of The PCB Design Magazine.

Share


Suggested Items

Leo Lambert Discusses IPC Training Program Updates

10/17/2018 | Real Time with...SMTAI
During SMTA International, EPTAC Technical Director Leo Lambert and Managing Editor Nolan Johnson discuss a variety of recent IPC educational program updates, many of which are designed to smooth out the training process. Lambert also explains how these changes will allow EPTAC instructors to optimize the way they present IPC classes, which include the CID and CID+.

Front-End Expert Mark Thompson of Prototron Circuits Publishes Book on Producing the Perfect Data Package

10/03/2018 | Dan Beaulieu
Errors and inaccuracies slow the process down because the CAM department has to correct their data package or ask customers to clarify their intent. In the quick-turn prototype business where people pay for time, a slowdown on a three-day turn can be a disaster. I recently sat down with Thompson to find out more about his new book and discuss the quest for the perfect data package.

Lee Ritchey Returns to AltiumLive with 32 Gbps Design Class

09/26/2018 | Andy Shaughnessy, Design007 Magazine
Lee Ritchey was one of the instructors for last year’s inaugural AltiumLive event, which drew hundreds of PCB designers. Now, Lee is back, teaching a high-speed design class at next week’s AltiumLive in San Diego. That class is sold-out, but you can catch Lee teaching the same class at the January AltiumLive event in Germany. I asked Lee to explain what he plans to cover in this course, and why PCB designers and design engineers should consider attending one of the events.



Copyright © 2018 I-Connect007. All rights reserved.