PCBA Tech - About the difference between SMT, PCB, PCBA, DIP

1. SMT is one of the basic components of electronic components. It is called surface mount technology (or surface mount technology). It is divided into no leads or short leads. It is a circuit assembly connected by soldering and assembly by reflow soldering or dip soldering. Technology is also the most popular technology and process in the electronics assembly industry.

Features: Our substrate can be used for power supply, signal transmission, heat dissipation, and structure.

Features: able to withstand the temperature and time of curing and welding.

The flatness meets the requirements of the manufacturing process.

Suitable for rework work.

Suitable for the manufacturing process of the substrate.

Low dielectric count and high resistance.

The commonly used materials for our product substrates are healthy and environmentally friendly epoxy resins and phenolic resins, which have good flame resistance, temperature characteristics, mechanical and dielectric properties and low cost.

The above is that the rigid substrate is solidified.

Our products also have flexible substrates, which are used to save space, fold or turn, and move. They are made of very thin insulating sheets and have good high-frequency performance.

The disadvantage is that the assembly process is difficult and it is not suitable for fine pitch applications.

I think the characteristics of the substrate are small leads and spacing, large thickness and area, better thermal conductivity, harder mechanical properties, and better stability. I think the mounting technology on the substrate is electrical performance, reliability, and standard parts.

We not only have fully automatic and integrated operation, but also have the dual guarantee of passing manual review, machine review and manual review, and the pass rate of products is as high as 99.98%.

Second, PCB is the most important of electronic components, there is no one. Usually, the conductive pattern made of printed circuits, printed elements or a combination of both on the insulating material according to a predetermined design is called a printed circuit. The conductive pattern that provides electrical connections between components on an insulating substrate is called a printed circuit board (or printed circuit board), which is an important support for electronic components and a carrier that can carry components.

PCB printed circuit board

I think we usually open the computer keyboard to see a piece of soft film (flexible insulating substrate), printed with silver-white (silver paste) conductive patterns and healthy bit patterns. Because the general screen printing method obtains this kind of pattern, we call this kind of printed circuit board a flexible silver paste printed circuit board. The printed circuit boards on the various computer motherboards, graphics cards, network cards, modems, sound cards and household appliances that we saw in the Computer City were different.

The substrate used in it is made of paper base (usually used for single-sided) or glass cloth base (usually used for double-sided and multilayer), pre-impregnated with phenolic or epoxy resin, and the surface layer is laminated with copper-clad film on one or both sides and then laminated to cure Become. This kind of circuit board copper clad sheet material, we call it rigid board. And then make a printed circuit board, we call it a rigid printed circuit board.

We call single-sided printed circuit boards with printed circuit patterns on one side, and printed circuit boards on both sides with printed circuit patterns on both sides. The printed circuit boards formed by double-sided interconnection through hole metallization are called double-sided boards. If a printed circuit board with one double-sided as the inner layer, two single-sided as the outer layer, or two double-sided as the inner layer and two single-sided as the outer layer of the printed circuit board, the positioning system and the insulating bonding material are alternately together and The printed circuit board with the conductive pattern interconnected according to the design requirements becomes a four-layer or six-layer printed circuit board, also called a multilayer printed circuit board.

Third, PCBA is one of the basic components of electronic components. The PCB passes through the surface mount technology (SMT) and the entire process of DIP plug-in insertion, which is called the PCBA process. In fact, it is a PCB with a patch. One is a finished board and the other is a bare board.

PCBA can be understood as a finished circuit board, that is, after all the processes of the circuit board are completed, it can be counted as PCBA. Due to the continuous miniaturization and refinement of electronic products, most of the current circuit boards are attached with etching resists (laminated or coated). After exposure and development, the circuit boards are made by etching.

In the past, the knowledge of cleaning was not enough because the assembly density of PCBA was not high, and some believed that the flux residue was non-conductive, benign, and would not affect the electrical performance.

Today's electronic assemblies tend to be miniaturized, even smaller devices, or smaller pitches. Pins and pads are getting closer and closer. Nowadays, the gap is getting smaller and smaller, and contaminants may get stuck in the gap. This means that relatively small particles may remain between the two gaps. An undesirable phenomenon that causes a short circuit.

In recent years, the electronics assembly industry has become increasingly aware of and calling for cleaning, not only for products, but also for environmental requirements and the protection of human health. Therefore, there are many cleaning equipment suppliers and solution suppliers, and cleaning has become one of the main contents of technical exchanges and discussions in the electronics assembly industry.

4. DIP is one of the basic components of electronic components. It is called dual in-line packaging technology, which refers to the integrated circuit chip packaged in the dual in-line form, which is also used in most small and medium-sized integrated circuits. Form, the number of pins generally does not exceed 100.

DIP capacitor plug-in

A CPU chip with DIP packaging technology has two rows of pins, which need to be inserted into a chip socket with a DIP structure.

Of course, it can also be directly inserted into a circuit board with the same number of solder holes and geometric arrangement for soldering.

DIP packaging technology should be especially careful when plugging and unplugging from the chip socket to avoid damage to the pins.

Features: multilayer ceramic dual in-line DIP, single-layer ceramic dual in-line DIP, lead frame DIP (including glass ceramic sealing type, plastic encapsulation structure type, ceramic low-melting glass encapsulation type) and so on.

DIP plug-in is a link in the electronic manufacturing process. There are manual plug-ins and AI machine plug-ins. Insert the specified material into the specified position. The manual plug-in has to go through wave soldering to solder the electronic components on the board. For the inserted components, check whether they are inserted incorrectly or missing.

DIP plug-in post welding is a very important process in the processing of PCBA patch. Its processing quality directly affects the function of PCBA board, and its importance is very important. Then post welding is because some components cannot be welded by wave soldering machine according to the limitation of process and materials, but can only be done by hand.

This also reflects the importance of DIP plug-ins in electronic components. Only by paying attention to details can it be perfect.

In these four major electronic components, each has its own advantages, but they are complementary to each other to form this series of production processes. Only by checking the quality of the produced products can a wide range of users and customers appreciate our intentions.