PClamp1221P
PowerClamp or PClamp TVS diodes are designed for use in harsh transient environments to protect sensitive electronics from damage or latch-up due to EOS, lightning, CDE, and ESD. They feature large cross-sectional area junctions for conducting high transient currents. These devices offer desirable characteristics for board level protection including fast response time, low operating and clamping voltage, and no device degradation.
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The U.S. Department of Transportation (USDOT) and the National Highway Traffic Safety Administration (NHTSA) have published regulations that require all cars, SUVs, trucks, and vans to have rear-view visibility systems that started May 1, 2018. In fact, until recently, the rear-view camera was the only camera used in many car models and was considered an excellent safety feature. Modern vehicles have evolved significantly in the past few years, adopting innovative safety features that include blind-spot detection, surround-view monitoring, forward and rear collision warning, lane keep assistance, and autonomous parking assistance. These features utilize cameras and sensors to inform the driver about the car and its surroundings via the dashboard display. Now, there are at least six cameras present in high-end vehicles. There may be video display systems in cars like DVD players and TVs for passengers.
Guarding LVDS Devices in Automotive Vehicles
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Since its initiation in the early 20th century, the automotive industry has evolved significantly, adopting many innovations, changes and adaptations. Modern cars feature sophisticated capabilities such as the backup camera, a full-featured infotainment system, smartphone docks, GPS navigation, Bluetooth connectivity, and several other advanced features. Not only that, some of the recent car models are capable of autonomous driving, forward and rear collision detection, and autonomous parking. It is easily imaginable that the numbers of electronic components used in a vehicle are proliferating. At the same time, the requirement for miniaturization of the electronic components is becoming critical to make space for new components.
The semiconductor industry is producing leadless packages of integrated circuits (ICs) to make room for the enormous number of electronic components and meet modern-day vehicles' safety and reliability requirements. A big challenge is the lack of visibility of the solder joints on the printed circuit boards (PCBs) during the post package assembly process. The connections are beneath the package and are not visible from the top and the side. So you cannot say for sure if the IC is adequately bonded to the PCB or not. Original equipment manufacturers (OEMs) have been using X-ray machines to detect unreliable solder joints. It is expensive and time-consuming to do so.
Moreover, this has not proven effective with multilayer boards or boards with complex layouts and routing procedures. Each vehicle PCB has to go through a strict automatic visual inspection (AVI) post assembly to comply with safety and reliability standards. The goal is to ensure that every electrical joint is adequately soldered and connections are reliable.
Side-Wettable Flanks for the Automotive Industry
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One single connecting port's name that is ingrained in our life is Universal Serial Bus or USB in short. It doesn't matter if I am a tech-savvy person or a Luddite, I have to use USB in every aspect of my life. Forget about me; my mom, who doesn't even know it is called USB, uses this port several times a day to charge her mobile devices. USB became very popular due to its ease of use and fast data transfer rate. Within a little over two decades, almost all consumer electronics gadgets come with one or more USB interfaces, from laptops and cameras to smartphones and wearables. However, things have changed a lot since the introduction. USB specification has evolved over 25 years from USB 1.0 in 1996 to the most recent version, USB4®. Figure 1 below shows the evolution of USB standards with the corresponding data transmission rates.
Shield USB4 Against EOS and ESD
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Motor vehicles have gone through much progress since their inception. Modern cars include autonomous and semi-autonomous driving, anti-lock braking systems, electric power steering, forward and rear collision warning, lane assistant, autonomous parking assistant, and automatic emergency braking. Advanced features such as GPS navigation, interior mood lighting, surround-view camera, advanced infotainment system, active antenna are standard in most modern vehicles.
Semtech’s Automotive CAN Bus Protection
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Over the past nine years since I have been with Semtech, Transmission Line Pulse (TLP) basics have always been one of the most important training topics for our new hires and customers. We have received many questions on why we emphasize and extensively rely on TLP analysis to provide the best solution to our customers. TLP testing doesn’t deliver the exact same waveforms as specified by industry standards like IEC 61000-4-2 or ESDA/JEDEC JS-001. It doesn’t guarantee that the IC or the system will pass testing for immunity to required electrostatic discharge (ESD) test levels. It is always recommended to verify all the results with the ESD generator after the TLP test is completed. So, why don’t we just simply test everything with our ESD generator, which is more familiar to most engineers and universally accepted? To answer that, I think it’s important to understand that TLP is not a replacement or an upgrade to the IEC tests, but it is complimentary to the ESD gun tests as an analysis tool. ESD gun test tells us YES or NO, but TLP can help us to understand WHY and HOW.
TLP Analysis Doesn’t Guarantee Compliance to ESD…
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When designing an electronic system, the often overlooked and underestimated subject of protection must be considered. In some cases, the designer may be working to meet a certain standard such as IEC 61000-4-2 for electrostatic discharge (ESD) immunity. Equipment which is installed in harsh operating environments, such as remote meters, robotics and telecommunications systems, will require higher levels of lightning protection. These are somewhat obvious requirements. Other protection concerns include short circuits, voltage spikes, dirty power, cable discharge events, and so on. With all these transient threats, a designer may become overwhelmed and ask: how much protection is enough to ensure a reliable system?
How Much Protection Is Enough?
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