Microwave Tech - The reliability of PCB circuit boards is very important in automotive applications

1, what are the standards of PCB circuit boards, let's take a look at them together.

(1)The shape should be as close as possible to the square, 2*2, 3*3, ... are recommended; but do not form a yin-yang board;

(2)the width of the PCB board is ≤260mm (SIEMENS line) or ≤300mm (the FUJI line); if automatic dispensing is required, the width of the PCB board is ≤125 mm*180 mm;

(3)The center distance between the small plates is controlled between 75 mm and 145 mm;

(4)The outer frame (clamping edge) of the PCB circuit board jigsaw should adopt a closed-loop design to ensure that the PCB jigsaw will not be deformed after being fixed on the fixture;

(5) Four positioning holes are made at the four corners of the outer frame of the PCB circuit board, with a diameter of 4mm±0.01mm; the strength of the holes should be moderate to ensure that they will not break during the upper and lower boards; the precision of the hole diameter and position should be high, and the hole wall should be smooth No burrs

(6)There should be no large components or protruding components near the connection point between the outer frame and the internal small board, and the small board and the small board, and there should be a space greater than 0.5mm between the components and the edge of the PCB circuit board. Ensure the normal operation of the cutting tool.

This is all about the standards of PCB circuit boards. I hope you have a new understanding of PCB circuit boards.

The general surface treatment of PCB includes tin spraying, OSP, immersion gold... etc. The "surface" here refers to the connection points on the PCB that provide electrical connections between electronic components or other systems and the circuit of the PCB, such as pads. Or contact connection point. The solderability of bare copper itself is very good, but it is easy to oxidize when exposed to the air, and it is easy to be contaminated. This is why the PCB must be surface treated.

2. Automotive electronics are not completely different from other complex electronic products: multiple central processing units, networks, real-time data collection, and extremely complex PCBs. The design pressure in the automotive industry is similar to that of other types of electronic products: the design time is short and the market competition is fierce. So what is the difference between automotive PCB and some high-end entertainment product electronics, for example? A world of difference! If the PCB breaks down in the entertainment product, people's lives are not threatened; but if it breaks down in the car, people's lives are in jeopardy. Therefore, the reliability design of automotive electronic components is a major aspect that needs to be considered in the design process.

Below we jointly understand several types of multilayerPCB boards:
A: Conventional type: As long as you understand the production of 6-layer boards, other 10, 20, 30 can be made. However, the higher the level, the higher the scrap rate of the finished product. B: Buried blind hole type: This kind of board is usually made different from the conventional board, because it has holes in it, and its process is different from the conventional board. The biggest problem is: the problem of alignment.

C: Special board: non-FR4 boards such as: PTFE, ceramic substrates, mixed plates of different materials, etc. This kind of board is the so-called technology.
D: BACK PANEL generally has a thickness of more than 5MM, and some unidirectional dimensions exceed 810MM. It is mainly used for the motherboard of large base stations. Now this type of board has the highest profit. Usually its problems are a test for conventional production lines. At present, the yield rate of this type of board is much lower than that of other boards. Dingji has a professional circuit board production team, with more than 110 senior engineers and professional managers with more than 15 years of work experience; it has domestic leading automated production equipment, PCB products include 1-32 layers, high TG boards, thick Copper board, rigid-flex board, high frequency board, mixed dielectric laminate, blind buried via board, metal substrate and halogen-free board.

Fast samples of high-precision circuit boards, 6-7 days for bulk orders for single and double panels, 9-12 days for 4-8 layers, 15-20 days for 10-16 layers, and 20 days for HDI boards. Double-sided proofing can be delivered in as fast as 8 hours.