caLogo

Features Articles

A striking lesson in leverage against a larger opponent.

The worst part is the silence. Experience says silence means they have nothing but bad news to report, and they’re afraid to report it. The technique is notably effective when conveyed (or not because it’s silent) across 10 or more time zones, thereby avoiding real time confrontation. Silence seldom means anything good.

So they say nothing. Employing the time-tested method of patient endurance, they expect by saying nothing that attention will be diverted inevitably, enabling the problem to magically go away. Just like politicians’ common practice, taking a dim view of voters’ average intelligence and grasp of the facts. People have short attention spans. They know that. They count on it.

The problem never goes away. Receivables still age until they’re settled. You have to push. They need to know that you know. Otherwise, they wait it out, and the silence, their friend, prevails. Notch one more for them. And you’re still not paid.

Read more ...

Stereotypes abound, but don’t let first impressions fool you.

You never know quite what you may run into when you go looking to hire new staff. Such was certainly the case for me at a local job fair hosted by a state-sponsored regional workforce development organization.

I received the invitation from the local Chamber of Commerce to have a table at this event. The cost was free and the hours were 9 a.m. through 1:30 p.m. Based on the description, I thought the chance was reasonable to find a couple hires to fill openings in our drilling and plating departments. While it has been years since I participated in a job fair, I was familiar with the format and the similarity to the proverbial "speed dating": quick conversation and move on!

Consistent with my expectations, on the specified day I show up bright and early at a community college, find the massive meeting room, locate my table among the 50 or so others in the room, and set it up with information about the company as well as the industry. All the tables were spoken for, and looking at the plethora of companies in attendance, I noted most were service providers. A good number, however, were manufacturing companies that produced everything from pianos to metal castings, with two of us, an EMS company and my circuit board fabrication company, representing "high technology."

Read more ...

Buyers beware: An ounce of copper is not 1 mil.

Long before I became part of the PCB industry some 30 years ago, a large study determined that for the typical two-layer printed circuit board, the amount of copper required for a reliable connection in a plated through-hole (PTH) was 0.0007 inches, or 0.7 mils.

Anything less than that could compromise PTH reliability, the study found, and anything more would not make much difference.

Simply put, the 0.001″, or 1 mil, as stated on most PCB fabrication drawings is a safety factor. Some corporate fab specs will even state a plating average of 1 mil, with 0.8 mils as the minimum, higher than the originally determined 0.7 mils.

However, even today, some PCB buyers confuse ounces with mils when it comes to the copper plating of a printed circuit board. It is important to know the difference.

Read more ...

Tips for adjusting to changing customer forecasts.

The EMS industry is running true to a cycle no one likes: big drops in demand following a period of inventory buildup. The drivers for inventory buildup were material constraints and unpredictable spikes in demand following the Covid lockdown period. OEMs increased both raw materials and finished goods in their desire to stay ahead of parts shortages and customer spending sprees. Unfortunately, our heated economy is finally slowing. While consumer spending has remained strong, they are tightening their belts on big purchases and purchasing fewer discretionary items.

As a result, electronics manufacturing services (EMS) providers are seeing a different set of issues than they have been dealing with the past two years. Material inventories are still high and forecasts are dropping as customers slow down new orders to burn off existing finished goods inventories. How do you counter these challenging trends? There should be three areas of focus:

Read more ...

Government-funded organization hopes to knock down barriers to commercialization.

The American Vacuum Society (AVS) held its annual conference in Portland, OR, with roughly 2,000 in attendance for the November meeting. The conference included many technical presentations by students, faculty and industry on cutting-edge issues associated with materials, processing and interfaces.

Among the highlights this year was a special session on the Chips Act. The session on the Chips and Science Act Implementation for Microelectronics (including workforce) was moderated by Dr. Alain Diebold, SUNY Polytechnic Institute, and Dr. Tina Kaarsberg, US Dept. of Energy Advanced Manufacturing Office.

The first invited talk was given by Dr. Jay Lewis, director, National Semiconductor Technology Center (NSTC). NSTC is a public/private consortium authorized and funded by the US government to serve as the focal point for research and engineering throughout the semiconductor ecosystem, advancing and enabling disruptive innovation to provide US leadership in the industries of the future. Dr. Lewis announced the incorporation of a new nonprofit entity, SemiUS, to operate the NSTC. SemiUS will work in partnership with the US Department of Commerce to develop and implement a wide variety of programs to fulfill the mission of the NSTC consortium. The focus is on building a strong semiconductor research and development ecosystem in the United States.

Read more ...

Fine tuning the timing of net groups.

When faced with a microcontroller and a companion memory chip, to unravel the crossed-over connections while maintaining high quality microstrip and stripline connections can be a daunting task. Add in the requirement around the time of flight for a typical memory bus or other family of high-speed connections, and you can spend considerable time sorting out that nest of interconnections.

As PCB designers, we go to great lengths to meet the requirements for additional air gaps around transmission lines. Isolating one trace from another becomes more important as the overall length of the traces grows. Crosstalk is a function of how far two traces run parallel to each other at a given distance apart. So, ultimately it is more than the minimum air-gap in play. The length of the boundary also matters.

With a number of connections that start in one general area and end at some other location, it’s easy to picture a river of traces running from here to there. The variance in length between any of the routes is small compared to their total length. Any traces on the long side get pulled tight to minimize their natural length. From that point, the traces that end up too short get some meanders along the way.

Read more ...

Page 4 of 148

Don't have an account yet? Register Now!

Sign in to your account