COB (Chip on Board)

Chip on Board (COB) is a packaging method in which a semiconductor chip is mounted directly onto a printed circuit board (PCB) and then coated with an epoxy layer for protection.

1. COB process:

• • Mounting chip on PCB: Semiconductor chip is mounted directly onto the surface of PCB with adhesive.
  • Wire bonding: Connecting the pins of the chip to the connection points on PCB with ultra-thin conductors (usually gold or aluminum wire).
  • Encapsulation: Coating with epoxy to protect the chip and conductors from environmental factors.

2. Advantages of COB

• • Compact size: COB allows the production of very small devices because the chip is mounted directly on the PCB without the need for a separate housing.
  • High thermal efficiency: Better heat dissipation due to the chip being mounted directly on the PCB, improving the performance and lifespan of the component.
  • Cost reduction: COB can reduce packaging and assembly costs compared to traditional methods, especially in mass production.
  • Increased reliability: Protective epoxy coating increases the durability and reliability of the device in harsh environmental conditions.

3. Disadvantages of COB

• • High technical requirements: Chip and wire bonding processes require complex techniques and equipment, requiring highly skilled personnel.
  • Difficult to repair: When a fault occurs, repairing the wiring connections is difficult and complicated, sometimes impossible.
  • Limitations on chip types: COB is mainly used for bare die chips, so not all chip types can apply this technology.

4. Applications of COB

• • LEDs: COB is widely used in the production of LED modules due to its good heat dissipation and compact size.
  • Medical equipment: Medical equipment requires high reliability and compact size, COB is the ideal choice.
  • Sensors and measuring devices: COB is used in sensors and measuring devices that require high precision and durability.
  • Consumer devices: Consumer electronics such as digital cameras, mobile phones also use COB technology to save space and improve performance.

COB production area image

Organizational structure of COB workshop

To receive a quote, please send technical documents to the email address tonhuynh@amtecor.com