Connect the Dots: How to Know If a CAD Tool Is Right for You

Carpenters have hammers, bricklayers have trowels, and painters have their brushes; for PCB designers, the tool that defines us is our CAD software. Designers spend hours, days, or weeks in their CAD tool for each circuit board design, examining each connection, plotting each through-hole, and carefully placing each specific component. They discover quickly that not all CAD tools are created equally. 

How can designers find the right CAD tools to fit their particular methodology and needs?

Not every designer spends the same amount of time immersed in a CAD tool. Some designers may just work on a few designs per year, which means there is limited opportunity to learn the ins and outs of complex CAD software. They definitely won’t have the time to invest in heavy customization. Sporadic use can also equate to a limited software budget to invest in an expensive CAD package or heavy customization of the one they have. Some designers go right from one design to the next with barely enough time to catch their breath, making that high-priced CAD tool a bargain due to its versatility, customizability, and sheer raw power. No names here, but we’ve worked with some real hotrods.

What’s Available in the CAD World?
A quick search reveals that the world of PCB design is flooded with tools. We read one article[1], promising “46 Must-Have Tools to Streamline PCB Design.” The average PCB designer is too busy to evaluate more than a handful of tools. To narrow the field, we need to look at some basic criteria.

Price
For hobbyists and part-time PCB designers, the price will most likely be the most important criteria, so let’s look at that first. Luckily, there are lots of low-cost and free CAD tools available, keeping students and hobbyist designers in the game.

When evaluating free tools, though, pay close attention. Some of them will be open-source or community-run projects, and while the philosophy behind them might be attractive, make sure those tools are still being actively maintained. When you run into a problem, you want to make sure you can get help.

Some low-cost and free CAD tools are funded and developed by PCB manufacturers. They produce tools that specifically work with their manufacturing process, which can be great if you have a specific manufacturer in mind. However, this choice can also lock you into a specific manufacturer path, so choose carefully. If your CAD tool is tied to a manufacturer, can you get the Gerber files? Do they cost money? Is the price reasonable?

Commercial packages can become expensive quickly. There are a few CAD tools available that charge a monthly subscription price, but most offer prices ranging from about $75 all the way up to over $2,000. Pay attention to the limits placed on products with multiple tiers of pricing and be particularly careful not to get caught in a “freemium” trap, where a piece of software seems great until that really important feature is locked behind an expensive paywall.

Design Tip: If you have a PCB manufacturer in mind, make sure their process is compatible with your CAD tool before you spend any time or money on it.

sunstone_fig1_0920.jpgComponent Libraries
CAD tools should be customizable with libraries full of parts and components, but you need to be sure that the tool you’re looking at can support the parts you need to use. Many tools like to brag about the size of their parts libraries, but don’t be fooled by a big number.

A typical designer might need a library of about 10,000 parts, but when looking at the library offered by a CAD tool, are you finding the parts you need? Look for commonly used parts and check whether the tool comes with proprietary libraries or access to specialized libraries.

No matter the CAD tool, eventually you’ll have to create components yourself. Make sure the tool provides the capabilities you need to both create new components and add them from external sources.

Complexity
CAD tools exist to tackle the complex problem of designing PCBs. Unfortunately, it’s inevitable that your CAD tool will itself be somewhat complex, but that doesn’t mean you shouldn’t evaluate a tool based on how intuitive and easy it is to use.

Ease of use is an area where open-source software tends to lag behind. If the price is an important factor in your choice, you may end up looking at a balancing act between price and usability. 

Help and Documentation
There will come a time when something in your PCB project will get too complicated, and you’ll end up needing help. You want to make sure that help is available before you put too many hours into a CAD tool, so evaluate these resources early in the process. Check out the tool’s documentation. Some tools make their documentation available online. Look for YouTube tutorials and websites that might be offering solutions to common problems. If there is a phone number for support, call and ask some questions. 

Those last two suggestions—checking the tool’s documentation and looking for video tutorials— can also help you evaluate a CAD tool without even downloading it. If there are too many people reporting problems, that might mean the tool is too difficult to use. Likewise, a YouTube tutorial that takes the viewer through too many convoluted steps can be a red flag toward usability.

Final Thoughts on Finding the Right CAD Tool
CAD software is almost always highly customizable with design rules, favorite libraries, shortcuts, and modules to increase productivity and make the design process personalized and special. 

sunstone_fig2_0920.jpgDesigners add their own libraries of specific ICs, parts catalogs, and components to make sure the right pieces are available. Getting all of these customizations just right can take a long time, so a designer doesn’t want to invest a lot of effort in one CAD tool just to abandon it and start over with another.

Pay attention to limitations, such as board size, and the number of pins or layers a tool can support. Watch for limits on minimum component pitch and the supported sizes for traces, spacing, and vias. Once you have narrowed the field, download the CAD tools that look the most promising, and try them out. Fifteen minutes or so should be enough to tell if the tool is intuitive and will fit your PCB project.

The most important part about picking a CAD tool, though, is that it shouldn’t make designing too much of a chore. You want designing to be productive and efficient, and in the end, maybe that’s the most important element to evaluate when you’re trying out different tools.

Design Tip: Double-check your components and ensure they have proper mechanical drawings. Be sure the physical dimensions of your components fit your design, not just the pins, and make sure your library parts match the datasheets; don’t just trust them out of the box.  

References
1. Trey Hooper, “Top PCB Design Software Tools for Electronics Engineers: 46 Must-Have Tools to Streamline PCB Design,” Pannam Imaging.

This column originally appeared in the September 2020 issue of Design007 Magazine.

Back

2020

Connect the Dots: How to Know If a CAD Tool Is Right for You

09-21-2020

The tool that defines PCB designers is our CAD software, and many discover quickly that not all CAD tools are created equally. Bob Tise and Matt Stevenson answer the question, "How can designers find the right CAD tools to fit their particular methodology and needs?"

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2019

Connect the Dots: A Penny for Your Thoughts on Copper

11-19-2019

You're probably thinking: “Bob can’t possibly write an entire article dedicated to the use of copper in PCBs.” To that, Bob says, “Hold my beer.”

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10-09-2019

You can save time, money, and effort if you are aware of the impedance math when you sit down to design your board. Gain this awareness by using a good impedance calculator, and you can build the right tolerances into your design. Impedance testing becomes a double-check of your work instead of the tool you rely on to tell you if your documentation is correct. Documenting impedance requirements properly is more onerous than most people realize. Though it seems simple, PCB documentation is a details game that often leaves knowledge gaps for your manufacturer.

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08-01-2019

When you send your design for manufacturing, your partner does not know what type of device the board will be part of nor the conditions in which it will have to perform. It’s common for harsh environments or exposure to mess up a board’s performance. If you call out materials that will not tolerate the end-product’s operating environment, bad things can happen—such as a smoking board, for example. Be sure your board can tolerate thermal stress or solder joints risk breaking and damaging components.

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Connect the Dots: The Future of PCB Manufacturing Doesn't Belong to Robots, but to the Users

07-09-2019

Is the world ready for the consequences of rapid automation? Will the use of robots displace entire categories of workers? Can artificial intelligence really “think”? How will manufacturing, including PCB manufacturing, be affected by all of these smart robots? These questions actually come from a pamphlet published in 1955: "The Age of Automation: Its Effects on Human Welfare."

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Sunstone Circuits was eager to return to MakeHarvard as a sponsor and creator of a competition category this year, also serving as both mentors and competition judges. If you were there, you saw us—we were hard to miss in our bright orange vests. As mentors, we were out and about helping students and answering questions.

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2018

Connect the Dots: Six Tips to Ensure Parts Fit on Your Board

12-12-2018

One of the most frustrating mismatches with alternative through-hole parts occurs when the land pattern matches, but the pin size is off. If hole sizes are too tight, pins may not fit through the holes, or if they do go into the holes, they may not solder well. Solder will need to flow through the gap between the pin and the hole barrel. If there is not enough space to allow enough solder mass to flow through the hole, the circuit board will absorb heat from the molten solder and cause the solder to solidify partway up the hole. This is called a cold solder joint and can result in a premature failure of your circuit.

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Connect the Dots: New Landing Design to Reduce Thermal Pad Failure

11-16-2018

You’ve finally finished your design. All the traces are correct and the IC landings are to the manufacturer’s specifications. A short run of test boards performs perfectly. For best results, you select a reputable domestic board house for production and a quality assembly shop to do the soldering. When the finished boards arrive, everything looks great. You’re in high spirits and congratulate yourself on a job well done. Then the reports start coming in.

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