COB LED vs SMD LED vs DOB LED: LED PCB Assembly and Design Solutions(Part1)

COB LED lights are much more expensive than SMD LED lights, do you know why? And in the LED market, you have a new product option, DOB LED, what is that? PCB is the core of LED products. You can find answers to these questions from LED PCB manufacturing. In this post, the LED PCB manufacturer PCBHERO gives a brief introduction to COB LED, SMD LED, DOB LED, and the differences between them.

Part1: What is COB LED

Features of COB LED: high thermal generation, small areas for thermal dissipation; evenly-shed light, no halo; LEDs are bonded on PCB
COB or chip-on-board is an LED chip package, in which multiple LED chips are integrated and bonded to the PCB and then sealed with glue. On the PCB board, you will notice that COB LEDs are placed altogether. When you use COB LED products, you will find that the light is shed evenly without the halo.

In PCBHERO's LED PCB assembly factory, COB LED bonding can be achieved in two different methods - wire bonding and flip-chip bonding.

LED PCB wire bonding: the LED chip is connected with the PCB using a gold or aluminum wire, and then the chips are sealed by glue.

LED PCB flip-chip bonding: the P-N junction of the LED chips is directly bonded with the PCB without any gold or aluminum wires. Compared with wire bonding, the chips are flipped.

Is COB LED bonding restricted by the PCB substrate materials? No, as long as your PCB design can handle thermal management. From PCBHERO, you can have COB LED chips bonded on ceramic substrate PCBs, FR4 PCBs, aluminum PCBs, flexible PCBs, and even clear flex PCBs. If you have trouble with thermal management, we can offer PCB design assistance for free.

Wire bonding COB LED PCBs are usually used for small-power LED lights, while flip-chip bonding COB LED PCBs are designed for high power devices. You can see the ceramic COB LED PCBs we make for spotlights, which can work continuously for more than 10 hours per day.


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