Do you know what a black object is on the PCB Jiangmen single and double-sided circuit board?

1. What is COB soft packaging

Careful netizens may notice that there is a black substance on some circuit boards. So, what is this substance? Why is it placed on a PCB circuit board, and what is its function? In fact, it is a type of packaging, often referred to as "soft packaging". When it comes to "hard" packaging, its composition material is epoxy resin. We usually see the same material on the receiving head and receiving surface, which contains the chip IC. This process is called "bonding", and we also call it "binding".

This is a wire bonding process in the chip production and manufacturing process. Its English name is COB (Chip On Board), which means chip on board packaging. This is one of the bare chip mounting skills, using epoxy resin to mount chips on PCB printed circuit boards. So why do some circuit boards not have this packaging? What are the characteristics of this packaging?

2. COB Soft Packaging Features

This soft packaging technique is often used for cost reasons. As the simplest bare chip mounting method, in order to protect the internal IC from damage, this packaging generally requires one-time molding, usually placed on the copper foil surface of the circuit board, with a circular shape and black color. This packaging technique has the advantages of low cost, space saving, lightweight, good heat dissipation, and simple packaging method. Many integrated circuits, especially low-cost circuits, only need to use this method to lead out multiple metal wires on the integrated circuit chip, then hand it over to the manufacturer to place the chip on the circuit board, solder it with a machine, and then apply glue to cure and harden it.

3. Usage occasions

Due to its unique characteristics, this type of packaging is also used in some electronic circuit circuits, such as MP3 players, electronic keyboards, digital cameras, game consoles, etc., as well as some low-cost circuits.

In fact, COB soft packaging is not limited to chips, but is also widely used in LED applications. For example, COB light source is an integrated surface light source technology that is directly attached to a mirror metal substrate on an LED chip.

Article sourced from Jiangmen single and double-sided circuit boardhttp://www.yonghongpcb.com