SMT Packaging Drives the Move to Multilayer Prototypes
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1 SMT Packaging Drives the Move to Multilayer Prototypes Nolan Johnson CAD/EDA Manager Sunstone Circuits S. Freeman Road Mulino, OR Phone: Fax: As electronic components continue to move increasingly into surface mount packages exclusively, prototype manufacturing firms are increasingly seeing a shift in the fabrication and assembly work needed to implement engineering prototypes. The shift is subtle but relentless: as new components come to market in SMT packages, QFPs, BGAs and the like, board design and assembly for prototypes must change to accommodate the surface mount components. In some cases, a prototype design that might otherwise have used through hole and DIP components now must make use of the SMT packages. And where that design might have once been assembled in house from fabricated boards and standard parts kept in hand in the design team s parts locker, now it needs the precise assembly work of a pick and place machine. This shift forces prototypes into a different manufacturing channel. Furthermore, the smaller and smaller dimensions associated with these surface mount components and advanced packages put additional strain on the designers during the prototyping phase. Dimensions, spacing and tolerances are much tighter. It wasn't too terribly long ago that just about any design could still be built with all thru hole parts, states Duane Benson, Marketing Manager at Screaming Circuits, a leading quick turn assembly corporation, Once the big CPU chips stopped showing up in PGA (pin grid array), thruhole PC motherboard possibilities went out. Then, when blue tooth and Zig bee came around,
2 most if not all of those chips came out in BGA, LGA or QFN forms no thru hole at all. Now, it's not too difficult to complete almost any design with all SMT parts. At our company, we have been tracking the increased use of a prototyping technique with which many of our customers, especially those using surface mount components and advanced packages, have been using to tackle the increased complexity of SMT prototyping and the economic stresses of the current market. It s an interesting development that also shows up in our conversations with printed circuit board engineers at trade shows, customer sites, or whenever we find ourselves discussing prototyping techniques with designers using a wide variety of PCB layout tools. It s not that this technique is new, but the economic pivot point has clearly shifted, a product of technology, component packaging, and recession style economics. Nevertheless, designers are increasingly using multi layer board designs throughout the prototype phase to shorten the initial design times and save project dollars in the long run. Here s how this approach works for many engineers: 1. Rather than struggle for a couple of weeks to squeeze their prototype design onto a two layer board, designers are adding an internal layer or two to the prototype board. With these additional layers available for routing, engineers can expand the spacing between traces just a little and let the auto router do the work. Where there might typically be a few days of effort to fit everything onto the two layer proto board, now the effort is reduced to a few hours. This drastically shortens the layout time spent on the prototype and potentially shaves a spin off the overall prototyping process by allowing the designer larger tolerances away from the critical routing close in to the advanced packages. 2. The designers then get the boards assembled and validate the prototype s core functionality. While the purchase price for the prototype s bare board will be a bit higher, the money saved in labor costs that result by taking a week or so off the prototype layout process are much greater than the incremental fab costs. 3. These designers tend to enter the production optimization phase ahead of their schedule and under budget, leaving them valuable breathing room with which to optimize down to a production ready two layer board. The benefits to the design team are as follows: Shorter design time reduced labor cost Better DFM tolerances reduced risk of shorts or design mistakes Fewer prototype spins saved budget dollars on boards and, more importantly, components & assembly labor
3 Large printed circuit board design firms have been using this prototyping technique for a number of years. It works well for designs in which there isn t a lot of high speed design, and where strict compliance is not a requirement. Obviously not all designs fit into this sweet spot, but when they do, you can use the technique to your advantage. So how does this all pencil out? Let s look at an example using some hypothetical numbers. As always, the specifics of your project will be different than in this example. Work the numbers with your specific data to estimate the cost savings you ll see in your environment. For the meantime, though, let s assume the following: One layout designer costs $100/day. Whether employee or contractor, this number is probably conservatively low, once you factor in the costs of health care, and facilities costs. The design in this example takes 10 days of schematic work The design in this example takes 12 work days to lay out as a two layer, or four days to lay out as a multi layer. Two layer printed circuit bare boards cost $450 to fabricate $1,500 in parts and assembly costs to populate your board A typical prototype process requires three spins Let s also assume that the multi layer technique results in a $600 per order cost for PCB fabrication, reduces layout design time from twelve days to four, and saves the design team one spin overall. The overall effect to the design team is that the layout portion of the process takes much less time. The saved design team labor cost is the big savings here. The multi layer board may cost a few extra dollars ($150) in this case, but the reduction in layout design time saves $800 per engineer in days saved alone, netting $650 per spin just in payroll. When we factor in the removal of one complete design spin (rework, revalidation, reorder, remanufacture, retest) the cost savings from the reduced spin just compounds on top of the per spin savings. In this example the project cost numbers roll up like this, resulting in a multi layer prototype that s actually 61% of the cost of the 2 layer approach, and requires 54% of the overall design cycle:
4 2 Layer Multi Layer First Spin Design Days Schematic Labor $1,000 $1,000 Design Labor $100/day) $1,200 $1,400 PCB Fabrication $450 $600 Components & Assembly $1,500 $1,500 Per spin cost $3,150 $2,500 Total Days 74 days 40 days Total Project Cost $10,850 $6,600 Now, for this technique to work well, there are a few prerequisites. If only some of these conditions apply, your payoff may not be as noticeable. If none apply, you re probably not a good candidate for this approach: Your board will fit within the restrictions of a two layer format once optimized. The first step is to assure yourself that you will be able to get your circuit to fit on your target production format before you even begin. Your company accounts for staff labor as a part of the project cost. If you are a hobbyist or an individual working on your own (no cost) time, then this technique still works, but is of more limited value. Your prototype board will be optimized before production. If your prototype is likely to be used unchanged for production, your product will carry an ongoing incremental cost increase as a result of the multi layer board. If your plan all along is to optimize down to a two layer configuration, then the 33 days you saved ought to give you plenty of time to get the optimization just right. Given the economic environment we ve all be working under in recent months, and the inexorable march toward smaller, faster, cheaper, the trend is no longer just to be found in the features and dimensions of our product designs. It also can be found in the business practices of our design teams. By making full use of multi layer, along with strategic use of assembly services, design teams can dramatically shorten key parts of the PCB prototyping design process, thereby validating their designs faster and easier. And, this can be done without a negative impact on the process of optimizing for production. In fact, the extra man weeks saved in prototyping are likely to deliver the extra time designers wish they d had to get their production designs beyond merely good, and into the realm of great. We hope this information helps your design teams work faster, easier and smarter, today, and in the future. About Sunstone Circuits Sunstone Circuits pioneered the online ordering of printed circuit boards (PCBs), and is the leading PCB solutions provider with more than 35 years of experience in delivering high quality
5 engineering software along with quick and on time PCBs for the electronic design industry. Sunstone Circuits is dedicated to improving the PCB prototyping process from quote to delivery (Q2D ) and provides live customer support every day of the year (24/7/365). For more information about Sunstone s PCB solutions plus online quote and ordering process, please visit
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