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Signal Integrity & PCB – Issues and Design Considerations

Signal Integrity A major issue when it comes to high-speed PCB layout guidelines is signal integrity. Loss of signal integrity with PCB units has long been an ongoing concern, so it’s important to keep signal integrity PCB layout considerations in mind when manufacturing, selling or purchasing printed circuit boards. Signal Integrity Issues and Printed Circuit Boards Frequency At low frequencies, you should not experience any major problems with signal integrity. However, with increasing signal speeds, you get higher frequencies, which can affect both the analog and digital properties of the system. You may experience reflections, ground bounce, crosstalk and ringing at higher frequencies, which can seriously damage the integrity of your signal. If you anticipate higher frequencies, you need to consider transmission line effects on the I/O signaling in your board design. Speed Naturally, the relationship between speed and frequency is one you need to keep in mind. Lower speeds

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Bow & Twist Issues with PCBS

Bow & Twist Circuit Board Issue and Prevention The bow and twist issue on Printed Circuit Board can cause components and parts to shift in the PCB assembly process, if the surface mount and through hole components x/y and z coordinate does not match the pcb, then it will make the PCB assembly process very time consuming and difficult. IPC-6012 defines the maximum bow and twist 0.75% on circuit boards, however some strict designs only allow bow and twist not to exceed 0.5%.  See below for IPC guidelines on how to measure bow and twist. Prevention of bow and twist on electronic circuit boards: 1. PCB Design: PCB designers should use copper thieving if necessary to balance the design from layer to layer to distribute the copper evenly. 2. Lamination: Prepreg between PCB layers must be symmetrical unless there is specific impedance requirements. 3. Multi-layer pcbs should use the same material manufacturer’s

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SMT Component Placement for PCBs

PCB: SMT Component Placement PCBs have conductive traces that allow electricity to flow through the board. Each SMT component on the board is placed in a specific location on the conductive pathway so the specific component can receive sufficient power to function. When considering the placement of components that use surface mount technology on a printed circuit boards (PCB), there are special considerations to be made. CTE Considerations There are a number of factors you must consider when establishing SMT component placement tolerance and spacing. One of the most important factors with regard to SMT component spacing and placement is CTE, or coefficient of thermal expansion. Many printed circuit boards are made of glass epoxy substrates with leadless ceramic chip carriers. When the CTE differential between the ceramic carriers and the epoxy substrate becomes too great, you may experience solder joint cracking, which happens after about 100 cycles. The solution

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PCBs for the Automotive Industry

Automotive Industry Printed Circuit Boards  These PCBs have revolutionized the way we drive and use our vehicles, from engine controls and airbag sensors to anti-lock brake management and even GPS support. Almost every modern convenience in the car in your driveway or the fleet in your business’ yard relies on automotive PCBs. And as we add more heads-up displays, windshield overlays, in-cab navigation systems and other electronics to help us drive or relax as we drive, the demand for reliable PCBs that don’t interfere with other systems is going to continue to rise. Automotive printed circuit boards from MCL are designed specifically to support each individual application and work in the real-world environments they will experience, whether they’re in the dashboard, under the hood or in areas of significant motion. That’s why, as a privately owned and ISO-9001 certified company, we engineer precision solutions custom tailored to your application. Creating

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UL, ISO and ITAR: Important Information About PCB Certifications

small circuit boards

UL, ISO & ITAR When it comes to printed circuit boards, there are certain standards in place that buyers look for. Experts may tell you to be sure to work with a UL PCB supplier, an ITAR registered supplier or an ISO PCB supplier. But what do these things really mean, and what exactly should you be looking for when seeking out quality printed circuit boards for your business? Here is some basic, useful information about these terms. UL PCB Standards Those seeking quality printed circuit boards may look for boards that are UL approved, such as a UL 796 PCB. Why? UL is short for Underwriters Laboratories, a global independent safety science company with over 100 years of expertise innovating safety solutions. UL is an accepted leader worldwide in testing, certification and standards development, with a goal to use safety science and safety engineering to promote safe living and

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 Guide to Reducing PCB Design Errors

Reduce PCB Design Errors Mistakes in your printed circuit board design can lead to increased costs for your engineers, designers and manufacturers while slowing your time to get to market. That hurts your revenue and can lead to significant problems in your department. No one wants to experience those concerns, so we’ve put together this quick look at some ways to reduce PCB design errors. We’re addressing the most common concerns, but remember to always work with an engineering team whose focus is to limit PCB design errors in the production phase. Look for Component Concerns Component placement can cause some major design headaches if there are mistakes. Placement needs to take electrical noise, thermal management and overall function into consideration. Make sure all your components and the overall board are sufficiently able to function. The design isn’t too difficult in most cases, and there is some leeway in your

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PCBs for LED Lighting Industry

PCBs and Their Applications in the LED Lighting Industry Printed circuit boards, or PCBs, are everywhere in our technology-based society. Everything from computers to medical equipment to cars contains these PCBs in one form or another. However, not all PCBs are the same— many of them use different designs or materials to suit a unique purpose. The base material is especially important for the circuit board, which helps determine how effectively the circuit board transfers heat. Some applications require specific properties in their circuit boards. This is especially true for temperature-sensitive applications, one of which is LED lighting. The LED lighting industry is expanding rapidly in response to increased interest in the more efficient and cost-effective lighting method, but much of the functionality of LED lights depends on the temperature of its system. For many companies, the solution to this problem is in aluminum-based PCBs. To help you understand why

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Long Printed Circuit Boards

Long Printed Circuit Boards Modern wireless applications need robust antennas, and that often means needing a long printed circuit board to integrate and support those applications. The design of an antenna can make or break your application, but relying on long PCBs can help you get the job done right. The antenna can be built right onto your long printed circuit board with copper optimization designs boosting its capabilities. Antennas tend to be an area where design can very difficult, and working with experts can help you optimize the impact your board will have. Get the best antenna by teaming up with the best engineers and manufacturers. Antenna Application Use Wireless antennas are used in almost every modern device that arrives in our homes. From cellphones and coffee makers to new washers and TVs, there’s an antenna, and it’s probably created right onto the circuit board. Printed circuit board antenna

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High Tech Custom Printed Circuit Boards

High Tech  Printed Circuit Boards High-quality custom printed circuit boards are a forte of our engineering team here at Millennium Circuits Limited. We’ve built a wide range of unique and specialty printed circuit boards whether you need support for custom antennas, high power and thermal boards, rigid-flex combinations or boards with a significantly high number of layers. High-tech printed circuit boards are a capability of MCL because we support a wide range of materials beyond standard FR-4 requirements. High-temperature specializations, custom board layouts and printing, immersion silver OSP finishes and a wide range of certifications and qualifications allow us to deliver the exact boards our customers need. High-Quality Custom Printed Circuit Boards vs. Standard Choosing high-quality custom printed circuit boards gives you a wider range of options beyond your standard PCB. You’re able to select what’s best for you including buried and blind vias, castellated holes, counter sink and bores,

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PCB Measling and Delamination

PCB Assembly Boards

What Is Measling and Delamination? Circular white spots and small hole-like areas that appear in your printed circuit boards are typically measling and delamination errors that can occur during the production or use of PCBs. These errors can interfere with normal operations and may ruin your PCB. It is easy to control for these errors when identified, and leading PCB brands like MCL can even design your boards in a way that limits delamination and measling errors. What Is the Difference Between Delamination and Measling? While measling and delamination may appear similar, there are some noteworthy differences to keep in mind. Delamination is when the layers of your PCB base materials experience a partial separation. This will cause gaps or bubbles that look like blisters. Delamination typically occurs in the production process when unwanted heat or humidity are present. Measling is the presence of white spots in the PCB weave

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