PCB News - COB on PCB circuit board

COB on PCB circuit board

Printed circuit boards {Printed circuit boards}, also known as printed circuit boards, are providers of electrical connections for electronic components.
Printed circuit boards are often represented by "PCB", but cannot be called "PCB boards".

1. What is COB soft package

In the process of using PCB, some users find that there is a black thing on some circuit boards. In fact, this is a kind of package, called "soft package". Its composition material is epoxy resin, which is usually seen. The receiving surface of the receiving head also uses this material, and its internal chip IC is set. This process is called "bonding", also called "bonding".

It is a wire bonding process in the chip production process. Its English name is COB (Chip On Board), which is chip on board packaging. It is one of the bare chip mounting technologies. The chip is attached with the help of epoxy resin. Mounted on the PCB printed circuit board. But why some circuit boards do not use this kind of package, and what are its characteristics?

2, COB soft package characteristics

In fact, this kind of soft packaging technology often takes into account the cost issue, so the simplest bare chip will be used for mounting to protect the internal IC from damage. And this kind of package usually requires a one-time molding, usually placed on the copper foil surface of the circuit board, the shape is round, the color is black. The advantages of this packaging technology are low cost, space saving, light and thin, good heat dissipation effect, simple packaging method, etc. Most integrated circuits, especially low-cost circuits, will use this method, and only need to be in the integrated circuit chip. Lead multiple wires out, and then the manufacturer puts the chip on the circuit board, uses the machine to solder, and finally the glue is solidified and hardened.

3. Application occasions

Due to the special characteristics of the package, in some electronic circuits, such as MP3 players, electronic organs, digital cameras, game consoles, etc., some circuits that seek low cost will also use this package. COB soft packaging is not only used in chips, but also widely used in LEDs, such as COB light source, which is an integrated surface light source technology that is directly attached to the mirror metal substrate on the LED chip.

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