SMT assembly chip processing is with the development of electronic products to the development of high precision, fine pitch direction, and SMT chip processing components of the minimum pitch design needs to be able to ensure that the PCBA pads are not easy to short and also take into account the maintainability of the components. Consequences of insufficient component-to-component spacing; One of the pins of the Bottom side connector on the PCB is too close to the next via hole, resulting in a short circuit between the pin and the via hole, and the PCB is burned. The distance between the component mounting hole and the pad is too small. The through-hole itself is directly connected to the pad, and there is no solder resist between the hole and the pad and the spacing is not suitable for the wave soldering process, or the welding parameters, such as speed and

The analogy that “ICs are just smaller versions of multilayer PCBs” is not entirely without merit. As processes become more differentiated between PCB manufacturers and assemblers, PCB design may begin to embrace some of the same philosophies used by the IC design industry to deal with escalating complexity. DFM manufacturability analysis is especially important in complex PCB design and manufacturing processes. 1. Purpose-oriented design concept The key to a DFM free design is to match the design rules and constraints to the capabilities of the PCB manufacturing and assembly supplier. Once the design rules and constraints are established, they become the review conditions that need to be followed at all times to ensure that the design is manufacturable. Problems that arise during design are easiest to identify and correct during the design phase. Having DFM awareness at the design stage can pay huge dividends. Identifying manufacturing issues during initial design

PCB solder mask ink according to curing method , solder mask ink has photosensitive developing ink , there are heat-curing thermosetting inks, There are also UV light-cured UV inks. , and PCB hard board solder mask ink, FPC soft board solder mask Ink , and aluminum substrate solder mask ink , aluminum substrate ink can also be used on ceramic boards. Vias are generally divided into three categories: blind vias, buried vias, and through holes. “Blind vias” are located on the top and bottom surfaces of printed circuit boards. It has a certain depth and is used to connect the surface circuit and the inner circuit. , Circuit  The “through hole” passes through the entire circuit board. , from the top layer to the inner layer and then to the bottom layer. Vias in PCB solder mask processing , Common via processes include: via cover oil, via plug oil, via window opening, Resin plugging, electroplating filling, etc. , each of the five processes has its

Consequences of insufficient component-to-board edge spacing; Devices that are too close to the edge may interfere with the operation of automated assembly equipment, such as wave or reflow soldering machines. Devices that are too close to the edge may be damaged during the panelling of the board at the end of the manufacturing process. This damage may be intermittent and difficult to detect and debug. The higher the device, the greater the potential for interference with the assembly equipment. Devices such as large electrolytic capacitors, for example, should be placed further away from the board edge than other devices. To avoid these problems, here are some general guidelines for device-to-edge clearance A general guideline for device clearance around the edge of the printed circuit board is 2.5 mm, which will provide enough room for test fixtures and most assembly operations. Panel V-grooves: For PCBs that will be v-grooved for punching, the device

Why do PCBs need to be stencilled? PCBs are assembled to meet production requirements. Some PCB boards are too small to meet the fixture requirements, so they need to be assembled together for production. In order to improve the soldering efficiency of SMT. Only need to pass through the SMT once to complete the soldering of multiple PCBs. In order to improve cost utilization. Some PCB boards are shaped, so assembling PCB boards can utilize the PCB board area more efficiently, reduce waste and improve cost utilization. PCB Imposition Method The gong board with V-cut is suitable for boards with devices on the board edges, which can’t be assembled without spacing, and adopt the form of assembling with process edges. Add process edge V-CUT processing at both ends, leaving spacing in the middle of the gong to facilitate the welding of components, otherwise the devices on the edge of the

What is hole-in-pad? Hole in the disk refers to the hole in the pad, the pad for the SMD disk, usually refers to 0603 and above SMD and BGA pads, usually referred to as VIP (via in pad). Plug-in holes in the pad can not be called a hole in the disk, because plug-in holes in the pad need to insert components to be soldered, all plug-in pin pads have holes. With the development of electronic products to light, thin, small direction, the PCB board is also pushed to the high-density, difficult to develop, so the size of the components are gradually becoming smaller. For example: BGA components of the package is small, the pin spacing becomes smaller. Pin spacing is small, then the package inside the pin is difficult to get out of the line, you need to change the layer of perforation out of the line. In the

Never Underestimate PCB Half-Hole Boards What is a PCB half-hole? Half vias are rows of holes drilled along the boundaries of a PCB for production purposes. When the holes are plated with copper, the edges are trimmed off so that the holes along the border are halved. The edges of the PCB look like a plated surface with copper inside the holes. What is the purpose of half-holes? Modular PCBs are basically designed with half vias, mainly for ease of soldering, small module size and functional requirements. Usually, a half-hole is designed in the PCB single edge of the hole, in the gong shape gong half, leaving only half of the hole in the PCB, commonly known as a half-hole. Design for manufacturability of half-hole plates 1. Minimum half-hole Minimum half-hole process manufacturing capacity is 0.5mm, the premise is that the hole must be in the center of the profile line,

Preface: In the complex PCB design and manufacturing process DFM manufacturing analysis is particularly important. DFM Design for Manufacturing, Design for manufacturability (DFM) DFM role is to improve the manufacturing process of the product. Today’s DFM is the core technology of parallel engineering, because design and manufacturing are the two most important links in the product life cycle, parallel engineering is the beginning of the design should be considered when the product manufacturability and assemblability and other factors. Therefore, DFM is the most important support tool in parallel engineering. The key of DFM is to analyze the processability of the design information, evaluate the manufacturing rationality and suggest the improvement of the design. DFM combines with CAX, PDM, DFX, etc. to form the Design for Life Cycle (DFLC) technology. DFX refers to DFA (Design for Assembly), DFD (Design for Disassembly), DFQ (Design for Quality), DFI (Design for Inspection), and DFE (Design for

What is the BOM? A simple understanding is: the list of electronic components, a product consists of many parts, including: circuit boards, capacitors, resistors, diodes, crystals, inductors, driver chips, microcontrollers, power supply chips, step-up and step-down chips, LDO chips, memory chips, connectors, connectors, pins, rows of mother, and so on. Engineers will be based on the product design, do a list of product parts called BOM table. What is a pad? PCB pads are divided into plug-in hole pads, SMD patch pad, is to solder components to PCB The components are fixed on the PCB with solder. , the wires inside the printed circuit board connect the pads, accomplish The electrical connection of components in a circuit. Reasons for BOM Errors 1. Wrong BOM Model BOM files are generated and output from EDA software. There are many situations that may lead to data errors in BOM files during the entire design process. For example: modifying

How to Ensure the Reliability Design of Electronic Products? What is Design for Manufacturability?  Design for manufacture urability , Right now from from set up count open beginning Test consider product of Can system make sex , improve product pass rate and reliability , Makes the product easier to manufacture while reducing manufacturing costs. Design for manufacturability is based on the idea of concurrent design, the manufacturing process is comprehensively considered during the product design stage Process requirements , test requirements and rationality of assembly , control the product through design cost , Performance and quality . Generally speaking, design for manufacturability mainly includes three aspects: PCB board manufacturability design, PCBA can be installed Design, low manufacturing cost design. The manufacturability design of PCB boards is mainly based on the perspective of PCB board manufacturing. , considering the manufacturing process parameters, thereby improving Board production pass rate and reducing process communication costs. For example, whether

How to Avoid Pits for Small-Sized Holes and Slots in Device Pins? PCB board for plug-in device pins need to be drilled to insert the device, PCB drilling is a process of PCB plate making, is also a very important step. Mainly for the board holes, alignment needs to play a hole, the structure needs to be punched to do positioning, plug-in devices need to play pin holes and so on; multi-layer board drilling is not a one-time play through, some holes are buried in the board, some of the board on top of the punch through, so there will be a drill two drilling. 1. USB device pin oval slot and USB type device shell pins are generally oval pins, some USB device pins are relatively small, so the design of the slot hole is smaller than the production process capacity. Because the industry’s smallest drilling machine slot knife