On My Via-In-Pad Soapbox (Again)

There’s never enough time. There’s never enough money. There’s never enough room.

I certainly say those things often enough, and sometimes it’s actually true. But other times, I’m just not looking in the right places. Here’s a board that is pretty much plumb out of room. Everything is so tight that many of the vias have to be put in the pads. Well, maybe.

Take the IC footprint (above). It needs a via to take a couple of connected pads to the other side of the PCB, but there isn’t enough room between the IC and the part just below it. Naturally, the logical thing seemed to be to put the via in the pads. Unfortunately, doing so will make it difficult to get a good solder joint. The big open hole will wick solder down to the other side of the board.

At first glance there doesn’t seem to be anything to do. But upon closer examination, there is some unused space here. I’d just slide the part up a little, as in the illustration below.

Then move the via south a bit and connect it to the pads with a trace just long enough to accept some solder mask. The solder mask will stop the solder from chasing the via off the pad and getting sucked down.

Duane Benson
Some solder suckers sit South of Sunday

http://blog.screamingcircuits.com

Trading Up

A group of five Democratic Senators (including Arlen Specter) this week introduced the Trade Enforcement Priorities Act of 2009 (S. 1982), which among other things mandates the US Trade Representative to identify trade enforcement priorities and prioritize which foreign countries’ practices on which it will focus its enforcement efforts in the coming year.

It’s nice to see this bill taking shape, as trade — particularly with China — has been a constant sore spot for out industry for a decade.

America needs a well-established policy, and one that has some teeth. This appears a step in the right direction.

DDi: Dynamic Once More

In news announced last night, Dynamic Details, aka DDi, remained profitable in the September quarter. Today’s picture of the quickturn PCB fabricator is much better than the one from a few years back, when the combination of poor management decisions and excessive M&A activity created a company that slid into Chapter 11 not once but twice.

Under president and CEO Mikel Williams, DDi has righted itself, and has turned a profit through the downturn, no small feat.

Today the company will hold its earnings call with analysts. Management will likely shed a little more light on its proposed purchase of Coretec. I’m anxious to see whether the Street responds with approval, or whether it takes the move as an harbinger of history repeating.

Diode Silk Screen Markings

It still happens. In fact, it just happened last night. We had a PCB with plus (+) mark to indicate the polarity of diode. Unfortunately, that doesn’t tell us which way to put the diode. (Read why here.)

You just can’t always tell. If it’s a barrier diode or a zener, the cathode might very well be the positive side. Or, it could be the negative side. An LED will usually have the anode positive, but again, there may be a few scenarios where it’s not. The bottom line is that a plus (+) or minus (-) sign doesn’t give us enough information to orient the diode.

We prefer that you use the actual diode symbol, or an industry standard anode or cathode indicator. “A” orGood markation “C” for anode or cathode can also work. Just make sure you also put the reference designator (D1, D2…) so we know it’s not a capacitor.

In the job last night, the build instructions were conflicting so we called and with the help of the designer, figured it all out, but it’s always best to do it right the first time. So be clear with your silk screen, the PCB you save may be your own.

Duane Benson

Spider or worm?

http://blog.screamingcircuits.com

A homerun in Atlanta

Well the smoke has cleared and the dust has settled. Last week we held our first ever PCB event in Atlanta. PCB Atlanta was the latest in our series of one day, regional table top shows and I have to say that all of us were really happy the way things turned out. The show floor was busy most of the day, and the forty or so exhibitors all had positive things to say about the event.
In some ways it was like a reunion. I saw people I hadn’t seen in years and it was really good to catch up with folks and find out what they were working on.

We ran a series of free classes during the day of the show. Class topics ran the gamut, from social networking to power and signal integrity. Just about every class was packed and it is always a good feeling when people tell you that they learned something at one of our shows.

I have to admit it was good to attend a show and still sleep in my own bed. Right now we’re working on the schedule for next year and trying to decide where we’ll do the regional shows. If you have suggestions, respond to this blog and we’ll get a discussion going.
p.

Board Buying Bonanza?

Here we go again?

DDi today proposed acquiring Coretec, a move that would close the gap between the California-based DDi and its quickturn rival, TTM Technologies.

It also marks the second potential M&A deal between “brand-name” board fabricators in the past four weeks. Earlier this month, Viasystems announced a pending acquisition of Merix.

Unlike the Via-Merix deal, while the impact wouldn’t be big in terms of the worldwide PWB fabricator rankings — likely boosting DDi from the low 60s to the top 50s in terms of size — it could change the pricing model for many board shops. DDi and Coretec have both invested heavily in HDI capability and have complementary markets (defense, telecom, quickturn/prototypes). It also would give the merged company a footprint in each of the continental US time zones. DDi had fiscal 2008 revenues of $190 million, while Coretec closed the year at C$81 million.

It strikes me that Coretec’s announcement late Friday that it would seek a cash infusion through the sale of 10 million shares of common stock was all the opening DDi needed to pull the trigger, especially given the relatively low market capitalization of Coretec.

This would be DDi’s first acquisition since its purchase of Sovereign Circuits in October 2006. DDi, of course, often made headlines in the last 1990s and 2000 as it bought company after company, building a PWB operation that once ranked among the top 20 worldwide. Simultaneously, Viasystems was doing much the same, only for both companies to hit the skids during the 2001-03 tech recession.

Today’s announcement makes sense, given the relatively cheap price DDi would have to pay to get Coretec. Whereas today’s headlines have certain echoes of 2000, it’s highly unlikely the risk of fallout is anywhere close.

‘Paste is Paste’: The Professor Hits the Road

Patty was staring out the window of her new office. She had just been made manager of a new department responsible for corporate wide productivity and advanced processes. At 25 years old, she was the youngest manager at ACME by six years. She was surprised that Pete was one of the folks in the new department and was concerned that Pete might have trouble accepting her as his boss.

When Patty mentioned her concern, Pete replied, “Hey ‘kid,’ are you joking? I’m thrilled to be in your department. Not only is the work the most interesting, but you are one of the few managers that really knows what they’re doing.”

Considering that Pete was Patty’s father’s age, this vote of confidence meant a lot.

The view out of her office window was terrific. She could see some of the local hills in Southern New Hampshire and the fall color change was striking.  A few coworkers claimed that on a clear day you could just see the top of Mount Monadnock. Patty had made some calculations using the position of her office, the distance and height of the local hills and had proven to herself that “the most-climbed mountain in the US” was 100 meters to short to be seen from her window. But the sky was so clear she couldn’t help by strain her eyes to see it she could get a glimpse of that majestic beak. Her pleasant interlude was jarred by the rude, demanding ringing of her office phone.

“Advanced Processes, Patty speaking,” she cheerfully spoke into the phone.

“Patty, it’s Sam. Can you come to my office now?” the voice on the other end spoke to her.

It was Sam Watkins, the site GM, and his call now did not make her nervous. Ever since the first visit of The Professor, Sam had treated her like a valued member of the team. It was his suggestion to launch a corporate center of competence for productivity and advanced processes and name Patty the manager. When he gave her the job, he said that a lot of the work would be corporate troubleshooting. She expected that Sam’s call related to this topic.

When she entered his office, Sam got right to the point. “Patty, there’s a crisis in our plant in Columbia, SC. A new COO took over four months ago and went on a cost-cutting spree. Since then, the plant’s profit is down 8%. We can’t figure out why. Go there and find out what’s going on. And develop a plan to fix it,” he ordered.

Patty excitedly returned to her office. She called Pete in and they discussed plans for their trip. Patty was trying to limit her use of The Professor, but this assignment seemed to beg for his participation.  His uptime improvement recommendations so impressed management, he was now on a permanent consulting retainer.

As Sam said, “Every time The Professor visits one of our facilities, they make several more million dollars a year. I wish he lived here!”

Patty made a call to The Professor and to her surprise he was available. They agreed to meet at the Columbia airport at noon in two days.

The time passed quickly and before she knew it she was in a rental car driving to the ACME facility in Columbia. Their first meeting was with the assembly process engineering team and the new COO. After introductions, the COO, Fred Perkins, spoke.

“I really don’t know why you are here,” he commented brusquely. “Profits are only down 5%; it’s probably just a random fluctuation.  I came here with a mandate to cut costs and dammit I did. I couldn’t believe what we were paying for solder paste, and I found a vendor that would charge 25% less. This was the first cost savings I implemented. Solder paste is solder paste. It’s just like butter. When I was COO of American Foods, they were paying too much for butter, and I found a vendor that would charge 9% less. Butter is butter, solder paste is solder paste,” he concluded.

“How much money will you save on paste this year,” Patty inquired.

“For all of our five lines, $100,000,” Fred proudly answered.

“How much profit do your lines produce per year?” The Professor asked.

“We have five, 20 -2 lines,” replied Jane Wilson, the site CFO.

“What’s a 20-2 line? “ asked Patty.

“Oh, sorry. It’s a term we use to here to describe line financial metrics. The ’20’ stands for $20 million in sales and the ‘2’ stands for $2 million in profit.” Jane responded.

“Thanks,” said Patty.

“Oh, but I guess we would have to call them 18.4 -1.84 lines now that the productivity and profit are down by 8%.” Jane sarcastically said as she glared at Fred.

At this comment, Fred lost his cool, he slammed his fist on the table and shouted at Jane. “It isn’t 8%, its only 5% and I told you it’s just a random fluctuation,” he fumed.

Is the lost profit just a random fluctuation? If not, what is the cause? And how are Patty and Rob doing?

Stayed tuned for the latest.

PCB Atlanta

Yesterday UPMG hosted our latest regional show in the Atlanta suburb of Alpharetta, Georgia. PCB Atlanta was another confrmation that the regional shows, with table top exhibits and and a one day free conference helps answer the call for face time between users and suppliers in a down economy. The turn out was good, the rains stayed away, and both exibitors and attendees seemed happy.

We’ve already received some very positive comments on the show. If you were there I’d like to hear your comments about the event. Even if you weren’t I’m be interested in your thoughts on the regional concept for smaller shows.

p.

Thanks, Hitachi!

This week I made it official. I retired my Hitachi VT 2000A VCR.

It’s been a long time coming. I bought it in 1988, while in college. Since then, I’ve watched approximately 4 million* movies on it. And even after I migrated to a DVD player and relegated the Hitachi to the kids’ basement playroom, it’s handled, without complaint, the best my sons could throw at it: dirty fingers and hands all over the body, Hot Wheels getting stuck in the playing mechanism, attempts to yank cassettes while  the machine was operating.

It’s been the iron man, the Lou Gehrig of VCRs: Shows up every day, ready to play. It’s a testament to good engineering and, especially, good workmanship (not to mention the merits of tin-lead solder). And after 21 years, it deserves a vacation. Thanks, old friend.

*Possible exaggeration.

Way to Go, Rita!

Congratulations to Rita Mohanty, who in addition to her duties as Director of Advanced Development at Speedline (and writing a bimonthly column on screen printing for CIRCUITS ASSEMBLY), somehow found the time to train for — and complete — the Chicago marathon.

Rita is part of a team that raises funds for various for developmental activities in India. The photo shows Rita and her son, Anup, after their 26.2 mile “fun run.”

Way to go, Rita!