FPC row line is what, functional purpose is what?

Release date：2021-11-15

1、 What is FPC cable

When it comes to FPC cabling, you must know or be familiar with what FPC is? FPC can be divided into many types according to functions, such as FPC antenna, FPC touch screen, FPC capacitor screen, etc. FPC cable is one of them. Generally speaking, FPC cable is a connecting line group that can be bent to a certain extent.

2、 Function and purpose of FPC cable

The function of FPC cable is to connect two related parts or products. Now, many products use FPC because it has certain twists and turns. FPC has been used in many products such as printers, mobile phones, notebooks and so on. FPC cable manufacturers are mainly concentrated in the Pearl River Delta, with Shenzhen as the leader.

3、 FPC cable composition and parameters

Because FPC cable is a kind of FPC, its composition is the same as that of FPC. FPC is generally long strip-shaped, and both ends are designed into pluggable needle shape, which can be directly connected with the connector or welded to the product. The middle is generally a line, because FPC cables need a certain flexibility. Therefore, the base material is generally calendered copper, which is resistant to twists and turns and flexible.

Wiring parameters:

The minimum line width and line spacing is 3mil / 3mil;

The finished product of the minimum through hole shall reach 0.15mm.

4、 FPC wiring process

The surface treatment process used for FPC wiring is generally gold precipitation and occasionally anti-oxidation. However, the anti-oxidation process can not withstand high temperature, and the environmental bearing capacity is worse than that of gold precipitation. The prices of the two are similar. Therefore, most of them adopt gold precipitation process. In addition, there are tin plating, tin spraying and other processes, but the temperature resistance of FPC is generally below 280 ℃, while the temperature of tin spraying will be more than 300 ℃, and the hardness of solder paste is small, so it is rarely used.

5、 Advantages and disadvantages of FPC cable arrangement

advantage:

Using FPC can greatly reduce the volume and weight of electronic products, which is suitable for the development of electronic products in the direction of high density, miniaturization and high reliability. Therefore, FPC has been widely used in aerospace, military, mobile communication, laptop, computer peripherals, PDA, digital camera and other fields or products. In addition, it can also be arranged arbitrarily according to the spatial layout requirements, and move and expand freely in three-dimensional space, so as to achieve the integration of component assembly and wire connection.

Disadvantages:

In the process of producing products, cost should be the most considered problem. Because soft FPC is designed and manufactured for special applications, the cost of circuit design, wiring and photographic plate is high. Unless there is a special need to apply soft FPC, it is better not to use it in a small amount of applications. In addition, since a lot of energy has been invested, later maintenance is also essential, so soldering and rework need trained personnel.

Storage of FPC cable

Different from other products, FPC flexible circuit board can not contact with air and water. So how should we store this product correctly? I believe you will find the answer after reading the following contents.

Firstly, the vacuum of FPC flexible circuit board can not be damaged. When packing, a layer of bubble film needs to be surrounded on the edge of the box. The bubble film has good water absorption, which plays a good role in moisture-proof. Of course, moisture-proof beads can not be less.

Secondly, after sealing the box, the box must be stored in a dry and ventilated place with a partition wall and off the ground, and avoid sunlight. The temperature of the warehouse should be controlled at 23 ± 3 ℃ and 55 ± 10% RH. Under such conditions, PCB boards with surface treatment such as gold deposition, electric gold, tin spraying and silver plating can generally be stored for 6 months, and PCB boards with surface treatment such as silver deposition, tin deposition and OSP can generally be stored for 3 months.