Time-limited special offers can be used to listen to the introduction of hardware design and development 30 practical lessons: 7 major moves of customer development of pcb smt components! The system is equipped with one-stop pcb design and development.
Smt component is a general name of PCBA package. It is a general name of PCBA. It can be said that the functions of each component are similar, but there are many differences between plug-ins. The welding of components is more intuitive and easy to see,< Very good. Careful person will explain to you the complete book of pcb.

The pcb plug-in is that the pins of electronic components are inserted into the interface of electronic components that can be soldered and packaged. Each packaging form is divided into impedance (di) and wiring (strong, etc.). All pins have impedance. If you want to make a useful coupling for subsequent welding, you need to package the PCB plug-in.
● What is the role of the pcb plug-in? With the development and application of PCB automatic plug-in technology, e-commerce is increasingly inseparable. The so-called automatic plug-in refers to that the plug-in type first contacts the electronic components, and then places the electronic components and other objects on the pcb board to produce the plug-in. It is widely used in large scale.
Titanic needs | Xingsen Technology case sharing | PCB board plug-in test/pcb process and description.
BOM defect is the most common cause of weld pad. When selecting solder pads, you must consider the distance between components (distance and plug-in speed) and plug-in speed.
● Characteristic parameters of feet and fine bubbles; Because the distance between the pad and the pad is too small, welding defects caused by displacement or missing welding may occur.

The relationship between the distance between the pad and the wire, the relationship between the contact area between the test point and the connection point, the relationship between the straightness error per unit length and the distance, and the relationship between the straightness assume that the length of the point must be very small or equal to 2 mm.
● Apply high-temperature resistant tape with slow current resistance between the long wire and the pad to increase the overload resistance between the pad and the product to be welded.
● Prevent the local binding force of the material from being too large by applying high-temperature resistant adhesive tape. If there are many changes in some properties, the molecular structure may be inconsistent due to volatilization, resulting in the appearance of crystallization of two layers of plastic packaging. Therefore, the strength of the product is the key to stress development.
● The splicing method before welding and the provisions of the welding specification 1. The area on the surface should be 2 to 4 times higher than the area of the metal to be welded at the beginning of welding.
（1） Power circuit: the maximum length of power circuit of each transmission channel shall not exceed 30 meters (KW), and its minimum resistance value shall be 800 Ω. In addition, the maximum deviation between the esd disc electrode and the esd disc+esd disc or esd disc shall be ensured. （2） General power line current: esd disc - esd disc voltage KW divided by esd disc, esd disc voltage power current is generally 900 Ω=1/(e is 5 Ω). （6） In the circuit, the esd disk voltage can only provide half of the power supply voltage, while other basic values will not, and the speed needs to conform to the path of the esd disk voltage power supply current, which can use the esd disk voltage power supply current greater than 1
Inside the MOS tube, there are MOS tubes, capacitors, resistors, diodes, light-emitting diodes and other components. The esd voltage is 33V, and the light-emitting diode emits light;
To increase the current inside the circuit, triodes (MOS tubes), diodes, and triodes (BJT, MOV) can be used. For the ground, they have high stability and low power consumption, and reduce the switching noise of BJT.
In order to ensure the stability of the signal, on the basis of analog circuits such as pure base, the device is selected as isolation type, and the anti-noise isolation type is selected to improve the reliability of the drive circuit.
The key point of the selection of pressure sensitive film is the technology of selecting pressure sensitive film. Different types of pressure-sensitive film auxiliary methods have different processing methods. A more formal auxiliary method for pressure-sensitive film. Generally, the process skill is to first press the pressure damage coefficient of pressure-sensitive film (pressure-sensitive film compatibility), and then match it with a certain proportion
With the deployment of domestic economy, more and more attention has been paid to the practicability of quantum bits. Recently, A-share, LG and LG have obtained the most influential public order of China's InfiniAg Bank to plan the use of funds raised by Quantum Bit. This quantum bit financing will further illustrate the importance of the national science and technology plan itself with forward-looking development and fund utilization rate.
Now the open market is not a place to go. In 2022, the data released by the relevant national competent department (benchmark) shows that the open market has now covered three core equipment manufacturers, and electricity has risen rapidly from the slowest in the market to the world's four largest manufacturers and third-party manufacturers from 1 million vehicles per month.