94v0 circuit board testing system and its reliability
18 0 Feb 01.2023, 11:31:55
94V0 is a flammability rating for printed circuit boards (PCBs) according to the UL 796 standard. It indicates that a circuit board has passed specific tests for flammability and will not easily catch fire in normal use. The rating is based on the results of tests such as glow wire ignition, vertical flame spread, and comparative tracking index.Printed circuit boards (PCBs) are essential components in a wide range of electronic devices, from smartphones and laptops to medical equipment and industrial machines. To ensure the safety and reliability of these products, manufacturers must use high-quality circuit boards that meet strict safety standards. One such standard is the UL 796 rating system, which assigns a flammability rating to PCBs based on their ability to resist fire. The 94V0 rating is one of the most common and sought-after flammability ratings in the electronics industry.A brief history of 94v0 circuit board rating standards:The UL 796 standard for flammability ratings of...
Classification of PCB by IPC and its advantages
47 0 Jan 29.2023, 15:25:13
IPC standards are made to regulate the functionality of PCB. The Institute of printed circuit boards (IPC) is a worldwide association that is developed for PCB-concerned standards. IPC has developed more than 300 functional standards which are being followed worldwide by all PCB companies. IPC categorizes PCB into three different classes 1, 2, and 3. These classes are based on the quality of production levels such as design, assembly, components, packaging, etc. IPC standards define the quality level of production and functionality of PCB. IPC is presently called Association Connecting Electronics Industries. It is associated with more than 4000 companies worldwide. These companies include automotive, computer, medical, military, aerospace, microelectronics, and telecommunication industries. IPC inspects their production value, assembly and components categorization, and inspection standards. History of IPC: IPC was developed in 1957 by six PCB manufacturers of the time. Over ti...
Transparent PCBs: Flexible and Ceramic Circuit Boards with High Transmissivity
53 0 Jan 11.2023, 11:14:28
Transparent PCBs are an emerging technology that offers a new level of design freedom and possibilities. This technology allows for the use of light-emitting components and other optical components on the same board. The optical transmissivity of these transparent PCBs is quite high, allowing more light to pass through the board than traditional copper-clad PCBs. This could open up possibilities for a variety of applications in a range of industries, such as medical devices, automotive lighting, and military applications. Transparent PCB SubstrateTransparent PCBs may be made from two different substrates. Either ceramic or glass is used. Compared to glass, ceramic transparent PCB substrate has a higher heat conductivity. However, its transmissivity is a little bit lower. When compared to glass, which has a transmissivity of 99.5% to 99.99%, it is roughly 75 to 85%.Quartz and borosilicate glass make up the majority of the substrate for glass transparent PCBs. Of all substrates, they h...
HOW DO I PREPARE MY PCB FOR FABRICATION
57 0 Jan 04.2023, 13:52:37
AN OVERVIEW ABOUT PRINTED CIRCUIT BOARDS(PCBS):-PRINTED CIRCUIT BAORDS or PCBs are circuit boards that have a printed distribution which direct and electrically or mechanically support your electrical components to be placed on your board, it has traces, wires and designed compartments for your components. The word PCB might not ring a bell in your ears but they could be found anywhere, if you open up a remote that controls your T.V you would see a little board which would be installed in the structure, that is your printed circuit board or your PCB.PCBs play a vital role in modern day as technology is advancing and improving every single day.Printed circuit boards serve as a base or a foundation for electronic products as these boards are being used in almost every electronic device.They are variety of places where PCBs can be found few are mentioned in the text below:-· Transformers· Capacitors· Electrical equipments like electromagnets· Cable insulationFABRICATION OF A PRINT...
Semi-Flex PCBs vs. Flex PCBs
64 0 Dec 26.2022, 10:21:08
INTRODUCTION TO WHAT PCBs ARE:· Ever wondered how Phones, Televisions, Laptops and many other electronics that we use in our daily lives have become more and more lighter, that’s because of constant advancement in technology also the usage of even tinier microscopic gadgets that are being made by engineers to further take the usage of electronics on another level.· We all have a know how about certain microchips that are being worked up on upon to be even smaller but there are more to just microchips there’s a huge usage of PRINTED CIRCUIT BOARDS which have provided more ease to devices.· PRINTED CIRCUIT BOARDS or PCBs are circuits that are made to fit many components in a single place on a circuit within a device.· A PCB is made up of a glass fiber which is Copper coated placed on a circuit either mounted or etched.· In the past when all the components like connectors, capacitors, insulators, resistors, microchips etc were all separately put into a device ,it didn’t...
What are the reasons why PCB produces tin beads?
72 0 Dec 08.2022, 16:30:53
Solder beads on a PCB, also known as solder fillets, serve several important purposes in the assembly and function of electronic devices. These reasons include providing structural support, ensuring electrical connectivity, and enhancing the reliability and durability of the device. First and foremost, solder beads provide structural support to the components on a PCB. When components are soldered onto a PCB, the solder forms a mechanical bond between the component and the PCB, holding them in place. This is particularly important for components that are subjected to vibration or mechanical stress, such as connectors and switches. Without the structural support of the solder beads, these components could become loose or even detach from the PCB, leading to electrical failure and potential damage to the device. In addition to providing structural support, solder beads also ensure electrical connectivity between components on a PCB. When a component is soldered onto a PCB, the so...
Via Tenting & Filling & Plugging
108 0 Nov 30.2022, 13:40:37
Due to the huge increase in the complexity of the hardware, it was so hard or impossible to depend on the old or traditionally techniques in the PCB manufacturing, for example how to transfer a large amount of current between the PCB layers, or how to exchange the signals between the different layers and how to insure that the soldering process will end without any problems when the PCB board is full of a huge number of components which are separated with a fraction of millimeter sometimes. All of this need some of non-traditional solutions and perfect processes to insure your board is fabricated probably, here are three of the most used techniques that solve the mentioned challenges:1- Via Tenting2- Via Filling3- Via PluggingFirst thing, we have to know in brief what is the Via and how does this Via solved many challenges that help in compressing the size of hardware and also improving its functionality.The Via in short words is about a tunnel or a hole that conducts between the trace...
PCB Design Guidelines for Reduced EMI
150 0 Nov 26.2022, 09:50:08
Every electronic device we use today is susceptible to electromagnetic interference (EMI). A printed circuit board (PCB), integrated chips, interconnect, and I/O cables comprise an electronic system. At high frequencies, the interconnects tend to act as antennas, resulting in EMI, depending on the length of the interconnects and the current carried by the conductors. These EMI radiations interfere with other devices in the area. International standards exist to limit the level of emissions. As a result, measuring and controlling electromagnetic radiation is critical.Various strategies can be used to reduce electromagnetic interference (EMI) on a PCB board. The various aspects must be considered and handled properly.1. Grounding2. Separation3. Shielding Separation A trace is any path that carries electricity from the driver to the receiver. These traces can create an antenna when they bend or cross, which can result in EMI. It is advised to separate all signals from other trac...
What conditions do PCB need to meet from the industry standards?
79 0 Nov 07.2022, 13:42:03
The PCB industry has developed for such a long time, and now there are some new changes in PCB design. One is more miniaturization, which is mainly driven by the portability requirements of smart devices; the other is the transformation of PCBs from traditional rigid boards to rigid-flex boards. And when the PCB is moving towards the high-end, there are two main aspects, one is that the data carrying and transmission rate are getting higher and higher, and the other is that for smart home and wearable devices, the demand for HDI is becoming more and more obvious.Users requirements for PCBs are also getting higher and higher. Experts say that higher speed, smaller size and faster time to market are both challenges and opportunities for PCB design. For customers, on the premise of meeting performance indicators, it is better to have a faster design delivery time.
Knowledge Encyclopedia: Drawing Circuit Diagrams of PCB
192 0 Oct 21.2022, 15:56:48
1.PCB common wiring rules(1) The PCB board is pre-divided into digital, analog and DAA signal wiring areas.(2) Digital and analog components and corresponding alignments are separated and placed in their respective wiring areas as much as possible.(3) High-speed digital signals are routed as short as possible.(4) Sensitive analog signals are routed as short as possible.(5) Reasonable allocation of power and ground.(6) DGND, AGND, and field are separated.(7) Power and critical signal alignment using wide lines.(8) Power and ground lines should be as radial as possible, as well as signal lines can not appear back to the loop alignment.(9) Digital circuits are placed near the parallel bus/serial DTE interface, and DAA circuits are placed near the telephone line interface.(10) Small discrete device alignment shall be symmetrical, the more closely spaced SMT pad leads should be connected from the pad outside, not allowed in the middle of the pad directly connected.(11) Priority of key signa...