PCB Tech - What are the performance and temperature resistance of PCB?

1. High reliability: PCB circuit boards can ensure long-term and reliable operation of PCB through a series of inspections, tests and aging tests.

2. Assemblability: PCB circuit board products are not only convenient for standardized assembly of various components, but also can be automated and mass-produced. At the same time, PCB circuit boards and various component assembly parts can also be assembled to form larger parts and systems, up to the complete machine.

3. Maintainability: PCB circuit board products and various component assembly parts are standardized design and large-scale production, so these parts are also standardized. If the system fails, it can be replaced quickly, conveniently and flexibly, and normal work can be quickly restored. .

4. Designability: PCB circuit boards can realize printed circuit board design through design standardization and standardization. It has the characteristics of short time and high efficiency,

which can meet various performance requirements of PCB circuit boards, such as electrical, physical, chemical, and mechanical Wait.

5. High density: PCB circuit boards have evolved from single-layer boards to double-sided boards, multi-layer boards and flexible boards, and now they continue to develop in the direction of high precision, high density and high reliability.

6. Testability: PCB circuit board manufacturers purchase advanced test equipment and instruments and establish a complete test plan to detect and appraise the product eligibility and service life of PCB proofing.

What is the temperature resistance of the PCB circuit board?

In order to ensure the quality of the finished product of the PCB circuit board, reliability and adaptability tests are required. The temperature resistance test of PCB circuit boards is to prevent PCB circuit boards from exploding, blistering, delamination and other adverse reactions at excessively high temperatures, resulting in poor product quality or direct scrapping, which is a problem that needs attention. So what is the temperature resistance of the PCB circuit board and how to do the heat resistance test? Let’s find out below:

The temperature problem of the PCB circuit board is related to the temperature of the raw materials, solder paste, and surface parts. Usually the PCB circuit board can withstand the temperature up to 300 degrees for 5-10 seconds; the temperature is about 260 when the lead-free wave soldering is used, and the lead is about It is 240 degrees.

PCB circuit board heat resistance test:

1. First, prepare the PCB production board and tin furnace.

Sampling 10*10cm substrate (or laminated board, finished board) 5pcs; "(The copper-containing substrate has no blistering and delamination phenomenon).

Substrate: 10cycle or more; Laminated board: LOW CTE 150 or more 10cycle; HTg material or more 10cycle; Normal material or more 5cycle.

Finished board: LOW CTE 150 above 5cycle; HTg material above 5cycle; Normal material above 3cycle.

2, set the tin furnace temperature to 288+/-5 degrees, and use contact temperature measurement to calibrate;

3. Dip the flux with a soft brush first, smear it on the surface of the board, then use the crucible tongs to take the test board and immerse it in the tin furnace, take it out for 10 seconds and cool it to room temperature, visually check whether there is any bubbling and exploding board, this is 1 cycle ;

4. If there is a problem of blistering and exploding board, stop the immersion tin and analyze the initiation point f/m immediately. If there is no problem, continue the cycle until the board explodes, with 20 times as the end;

5. The blistering part needs to be sliced and analyzed to understand the source of the detonation point and take pictures.

The above introduction is about the temperature resistance of PCB circuit boards. I believe everyone knows it. PCB circuit boards will produce some undesirable problems at overheated temperatures. Therefore, it is necessary to understand in detail what the temperature resistance of PCB circuit boards of different materials is, and do not exceed the maximum temperature limit, so as to avoid PCB circuit boards from being scrapped and increasing. cost.