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The Basic Knowledge of PCB in PCB Assembly

In today's society,PCB is used widely in our all-sides life.As a necessary part, it plays an important role. Therefore, we have to have a good knowledge of PCB. Today I summarized PCB knowledge for you.  Definitions: For standard PCB, it is the combination of bare board and components on it. While for bare board PCB, it is called printed wiring board. We usually call it PWB. (1) Traces: The base material of PCB is comprised of dielectric, heat insulation, uneasy to bend materials. On its surface, we can see thin traces, its material is copper. Originally the copper covered the [...]

How should we inspect incoming materials in PCB assembly?

1.PCB size and appearance inspection PCB size inspection mainly includes the diameter of the processing hole, the spacing and its tolerance, and the small edge of the PCB; While PCB appearance inspection is about the solder mask and the pad alignment, for instance, whether the solder mask has impurities, peeling and wrinkling, the benchmark mark is qualified, the circuit conductor width (line width) and spacing meet the requirements or not.   2.PCB warpage and distortion detection The basic test principle: the PCB under test is exposed to the thermal environment and carry out the thermal stress test. In addition, a typical thermal stress test [...]

PCB & PCB assembly E-test fixture

The fixture or shelf used for testing is called a E-test fixture; the test racks we know here are for PCB and PCBA (PCB assembly) What raw materials do you need? Acrylic plates, locating posts, ejector pins, cards, leads, etc..In order to select according appropriate materials to produce the E-test fixture We need to choose it based on the actual situation, it can greatly reduce the cost, at the same time a general base night repeated use can greatly reduce the cost, and make the E-test fixture making standardization, convenient production, improve the quality of the E-test fixture. The selection [...]

RF PCB Layout: Interconnect Losses

Your trace geometry and layer stack will have a major effect on signal integrity as you route high frequency analog signals throughout your board. Newer designers will likely default to a microstrip geometry, possibly with guard vias to provide isolation between different circuit blocks and to suppress radiated emissions. The question of which trace geometry to use is about more than isolation; it is also about avoiding losses due to dielectric absorption, roughness losses, and scattering from your PCB substrate. The alternative to using microstrip transmission lines is to use stripline transmission lines. Routing striplines on a dedicated interior layer [...]

Hitechpcb Supply Ceramic PCB for PHILIPS company

Hitech Circuits Co., Ltd. is a leading Ceramic PCB Manufacturer and Ceramic Substrate Manufacturer in China, we specialized in Ceramic PCB Manufacturer Ceramic Substrate Manufacturer, Electronic Ceramic Supplier, AL2O3 Ceramic Supplier, ZRO2 Ceramic Supplier, High Temperature Ceramic Coating, Industrial Ceramics Manufacturer, Anti ESD Coating, Anti Glue Coating, and Silicon Carbide Coating Services. The products are widely used in high power LED ceramic substrate, microwave wireless communications, HCPV solar animal cells, ceramic sensor substrates, semiconductor and military electronics. DBC Ceramic PCB DPC Ceramic PCB HTCC Ceramic PCB LTCC Ceramic PCB

Mpcb or metal pcb

Thermal substrates for high watt density SMT applications   Metal core thermal PCB (MCPCBs, MCB, IMPCB or IMS) are widely used in applications where a dense wattage calls for a good thermal heat dissipation. The thermal efficiency gained by a metal based board allows for downsizing designs and removal of hardware. To avoid short circuits, there is an electrical insulation between the copper traces/pads and the base metal using a tailored dielectric layers with high thermal conductivity.   Thanks to metal core PCB, power densities can be increased while components remain cool, increasing life and durability. It also allows modules [...]

Electronics Manufacturing Steps of PCBA Circuit Board

Let’s understand the electronics manufacturing process of PCBA in details: Solder Paste Stenciling First and foremost, the PCBA company applies a solder paste to the printed circuit board. In this process, you need to put solder paste on certain portions of the board. That portion holds different components. The solder paste is a composition of different tiny metal balls. And, the most-used substance in the solder paste is tin i.e. 96.5%. Other substances of solder paste are silver and copper with 3% and 0.5% quantity respectively. The manufacturer mixes paste with a flux. Because flux is a chemical that helps [...]

PCB assembly Defect Coverage Using Automated Optical Inspection (AOI)

PCB assembly Defect Coverage Using Automated Optical Inspection (AOI) Automated Optical Inspection (AOI), which is an automated visual inspection of a Printed Circuit Board (PCB), provides 100% visible component and solder-joint inspection. This testing method has been in use in PCB manufacturing for almost two decades. It plays a critical role in ensuring that there are no random faults in the assembly. The technique, which uses lighting, cameras, and vision computers, is incorporated in the assembly process to guarantee the highest possible quality throughout each phase of a product’s life cycle. The method enables fast and accurate inspection and can [...]

Ceramic PCB- Alumina Oxide (Al2O3) PCB and Aluminium Nitride (AIN) PCB

CERAMIC PCBs- Alumina Oxide (Al2O3) PCB and Aluminium Nitride (AIN) PCB With recent advances in the market, Ceramic PCBs have become a more viable option for PCB designers. With the continuing requirements for miniaturisation, microelectronics and high-power LED packages, the need for substrates capable of withstanding high operating temperatures, whilst offering outstanding thermal performance is a must. Ceramics have been widely used in electronics/electronic components for years due to their thermal, and mechanical advantages. With recent advances in technology and manufacturing capabilities, they are now replacing entire Ceramic PCBs. Since their introduction, Ceramic PCBs have received enormous attention from the [...]

Material Selection for High frequency PCB Fabrication

We mostly use high frequency laminates in high frequency PCB. However, these are often difficult to fabricate. Because they must maintain the thermal heat transfer of the application due to the sensitivity of the transmitted signal. So, we need special materials for high frequency PCB manufacturing. When you are selecting a material for High frequency PCB, you must keep the following in mind. Dielectric constant It is the ability of a material to store energy when we apply an electric field. However, it is a directional property which means that it will change with the axis of the material. So, [...]