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PCB Corrosion Causes

PCB Corrosion Causes Corrosion is one of the major enemies of printed circuit boards. A sufficiently corroded circuit board won’t work, and the steady advance of corrosion is inevitable. But why do printed circuit boards corrode, and what are some of the most common causes of PCB corrosion? What Is Corrosion? Corrosion is the process of oxidation that happens when oxygen bonds with metal, producing rust and causing the metal to flake off and lose its valuable chemical properties. Since printed circuit boards are largely made of metal and are exposed to oxygen, they must corrode eventually. However, not all metals are created equal when it comes to corrosion. Some metals corrode almost immediately while some seem to never corrode. Metals that are highly resistant to corrosion include: Graphite Gold Silver Copper-nickel alloy Metals that are highly susceptible to corrosion include: Plated tin Lead Copper Plated nickel Metals that are

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Guide to Wave Soldering Problems for PCBs

What Is Wave Soldering? Wave soldering is a type of soldering process used during the bulk manufacture of printed circuit boards, or PCB. The wave soldering process allows manufacturers to quickly and reliably solder large printed circuit boards. The process gets its name from the wave of solder each board gets passed over. Using a wave of solder as opposed to individual solder points produces solder joints that are mechanically and electrically reliable. The wave soldering process is effective for both the conventional through-hole method of PCB assembly and also the newer surface-mount method. So what’s in a wave solder machine, and how does the process work? At its core, a standard wave solder machine starts with one component: a heated tank of solder that is maintained at the required temperature for the specific soldering process that is taking place. Inside the tank, the technician sets up a wave of

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Guide to PCB Stiffeners

Guide to PCB Stiffeners One of the popular types of printed circuit boards that Millennium Circuits Limited offers is flexible circuit boards. If you’ve used flex PCBs before, you know how useful they can be. Flex circuit boards allow you to outfit products with circuitry when the design of those products won’t admit a rigid circuit board, so they’re invaluable for many electronics applications. However, flex printed circuit boards have their drawbacks, one of which being that they may not be rigid in places that actually need stiffness — PCB stiffeners were created for these situations. When you’re working with flex circuit boards, you often need flex PCB stiffeners. You may not be familiar with PCB stiffeners, or you may have an idea what they are but not be entirely sure how to apply them. So, what are PCB stiffeners, and how do they work? How Do PCB Stiffeners Work

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IC Packaging

IC Packaging What is IC packaging, and why is it important for your electronics applications? If you work in the electronics industry and are not clear on how IC packaging material can work for you, here is a basic breakdown of the idea behind IC packaging. What Is IC Packaging? IC packaging, or Integrated Circuit packaging, refers literally to the material that contains a semiconductor device. The package is a case that surrounds the circuit material to protect it from corrosion or physical damage and to allow for mounting of the electrical contacts connecting it to the PCB. There are many different types of integrated circuits, therefore there are different types of IC packaging to consider, as different types of circuits will have different needs when it comes to their outer shell. IC Packaging Families There are three main types of IC packaging families: Leadframe: Leadframe packages are typically suitable

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How to Measure Solder Mask Thickness

How to Measure Solder Mask Thickness The solder mask is an essential element in printed circuit board manufacturing. Without a quality solder mask, most printed circuit boards wouldn’t last very long. There are several elements that go into creating an effective solder mask, and it’s a key feature of your printed circuit board’s makeup. What is a Solder Mask Solder mask is a material used to protect the copper on the circuit board with a protective layer of liquid photo imageable lacquer. This mask goes on both sides of the circuit board to protect the copper from problems that could lead to failure, such as oxidation, shorts from outside conductive influences, soldering, high voltage spikes or environmental factors and so forth. When fabricating the printed circuit board, you’d spray the solder mask onto the production panel, then apply UV exposure with the correct solder mask pattern, then develop and dry

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The PCB Manufacturing Process

The PCB Manufacturing Process The printed circuit board (PCB) acts as the linchpin for almost all of today’s modern electronics. If the device needs to do some sort of computation — such as is the case even with simple items like a digital clock — chances are there’s a PCB inside of it. PCBs bring electronics to life by routing electrical signals where they need to go to satisfy all of the device’s electronic requirements. For this to happen, PCBs are laid with a network of paths outlined in the traces. It’s these copper pathways that allow PCBs to direct electrical currents around their surface. There are three main types of circuit boards that get manufactured on a consistent basis, and it’s important to understand the differences between each so you can decide the right circuit board for your requirements. The three main types of circuit boards in current manufacture

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Halogen-Free PCB

Halogen-Free PCB While researching various types of printed circuit boards for your industry applications, you may have come across a mention of the halogen-free PCB and wonder if it is right for you. What is a halogen-free printed circuit board, and in what circumstances would you need one? Do I Need Halogen-Free PCBs? The short answer is that you probably want all your PCBs to be halogen-free. To understand why, it’s important to know what halogens are. Halogens are elements, many of which historically were used in printed circuit boards, often because it was cost-effective to do so. However, we now know halogens are extremely toxic to humans, and you probably do not want them in your PCBs despite their electronic benefits. What Is a Halogen-Free Printed Circuit Board? The family of halogen elements includes chlorine, bromine, fluorine, iodine and astatine. The most important elements with respect to PCB toxicity

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How to Clean Printed Circuit Boards

How to Clean Printed Circuit Boards Printed circuit boards that are components of commonly used devices like smartphones and tablets can be subject to a wide variety of contaminants over the course of their use. There is an increasing need for services to clean PCBs that have been corrupted by contaminants but not actually physically broken. What do you use to clean circuit boards? Challenges to Circuit Board Cleaning Cleaning printed circuit boards is a very delicate process. When you are working with a printed circuit board, you are dealing with a variety of exposed components and connections that can easily be damaged if you attempt to clean the board improperly. How you will approach cleaning your printed circuit board will depend in large part on the types of contaminants you are dealing with. Contaminants you may have to clean from a printed circuit board include: How to Clean Dust

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PCB Panelization Guidelines

PCB Panelization Guidelines Automated circuit board assembly equipment often has trouble working with smaller boards, resulting in more frequent defects during the assembly process. To minimize these defects and improve throughput of the manufacturing process, many companies use a process called panelization, resulting in a PCB panel. What is a PCB panel? A PCB panel, also called a PCB array, is a single board consisting of multiple individual boards. Once assembled, the panel is then broken apart, or depanelized, into the individual PCBs during the breakout process. The benefit of the printed circuit board panelization process is a decrease in defects as automated assembly machines tend to encounter fewer problems during the assembly process. In addition, panelization also reduces cost by improving throughput. Successful PCB panelization requires multiple design specifications to work properly, including considerations surrounding panelization methods. We’ll detail these panelization methods and their specific requirements more thoroughly in

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Common Flex PCB Issues

Common Flex PCB Issues Flexible PCBs are a tremendous innovation in the world of printed circuit boards. Rather than having to adhere to a rigid structure, these printed circuit boards can be bent, shaped and twisted as need be to fit your application. Some modern applications would be impossible without them. However, as you may have discovered if you work with flex PCBs, some flexible circuit board issues can arise. Why Do Flex Printed Circuit Board Issues Happen? In most cases, flexible circuit board issues arise because the designers are used to designing rigid circuit boards, so they design flex circuit boards according to the same principles. Of course, flex circuit boards are not rigid circuit boards, and they require their own flex-friendly design. What Are Some Common Types of Flex Printed Circuit Board Issues That Occur? Some of the most common flexible circuit board issues are: Solder Mask/Coverlay Openings

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