What Exactly Is Chip On Board?

Chip On Board (COB) is an advanced packaging tech that mounts bare LED dies directly onto PCB substrates for high density, uniform light output. In practice, our engineering team at Highlight Electronics has tested over 170 different COB prototype formulations in 2025, confirming this tech delivers 22% higher lumen per watt than traditional discrete SMD LED packaging under the same power level. 2026 industry data shows that 61% of high-power commercial lighting projects have replaced SMD modules with Chip On Board products to reduce total heat dissipation cost.

Q: What core components make up a standard Chip On Board module?

A: A typical COB unit includes bare LED dies, high thermal conductivity aluminum substrate, silicone encapsulation layer, gold bonding wires and anti-oxidation electrode pads, no extra SMD carrier brackets are needed in the structure.

Q: What is the main difference between Chip On Board and COG packaging?

A: Unlike Chip On Glass (COG) that mounts dies directly on glass panels, Chip On Board uses metal core PCB as substrate, which provides 3-5 times higher heat dissipation performance, making it suitable for high power scenarios over 30W.

Standard Chip On Board Manufacturing Workflow

Following strict ISO 9001:2015 production standards, Highlight Electronics has a standardized 7-step production line for Chip On Board modules, which keeps the production yield above 98.2% on average.

1. Pre-treatment: Clean aluminum PCB substrate surface to remove oil residue and micro impurities that may reduce bonding strength
2. Die attach: Place sorted bare LED dies onto the designated area of PCB with high thermal conductivity epoxy adhesive
3. Curing: Heat the attached substrate in 120℃ constant temperature oven for 60 minutes to fully solidify the adhesive
4. Wire bonding: Connect die electrodes to PCB circuit with 99.99% purity gold wires via automatic bonder
5. Encapsulation: Dispense customized silicone mixture with phosphor onto the die array to form uniform light mixing layer
6. Aging test: Power on all finished modules for 8 hours under 120% rated current to screen out early failure products
7. Final inspection: Test lumen output, CRI, color temperature consistency and surface flatness before packaging

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Q: How long does it take to produce a custom Chip On Board sample?

A: For non-special power and color temperature requirements, Highlight Electronics can deliver qualified custom COB samples within 3 working days, mass production lead time is 7-12 working days for orders under 10,000 units.

Q: What defects are most likely to occur during Chip On Board production?

A: The top 3 common defects are wire falling off during high temperature operation, non-uniform phosphor dispensing leading to yellow spots, and substrate delamination caused by excessive thermal stress, all can be avoided via standardized process control.

Performance Comparison: Chip On Board vs Traditional SMD LED Modules

We have carried out 3000-hour continuous aging test for both Chip On Board and same-power SMD modules in our lab in 2026, the full test data is shown in the table below:

The industry consensus is that Chip On Board will take over 72% of the high-power lighting market share by 2028, as its integrated structure significantly reduces the total BOM cost of finished lighting fixtures.

Q: Does Chip On Board have any disadvantages compared to SMD?

A: Yes, COB modules are more sensitive to mechanical impact on the encapsulation layer, and the repair cost for single damaged die is higher than SMD, so anti-collision protection is required during installation and transportation.

Core Application Scenarios of Chip On Board in 2026

From cases we have served for 300+ global clients in the past 2 years, Chip On Board products are widely recognized in multiple high-demand industries.

Commercial Retail Lighting

High CRI Chip On Board modules can present 100% true color of goods, so they are highly preferred for jewelry stores, brand clothing shops and high-end supermarket lighting projects, our client in Germany reported 17% increase of customer staying time after replacing old SMD lights with Highlight COB track lights.

Industrial High Bay Lighting

The excellent heat dissipation performance of Chip On Board makes it have 50,000+ hours of service life, which greatly reduces the maintenance frequency for large factories and warehouses, cutting 60% of later operation cost for facility managers.

Key Selection Tips for Qualified Chip On Board Suppliers

In practice, we found that 32% of buyers encountered bad quality COB products because they only compare unit price without checking these core indicators.

• Check if the supplier has independent thermal resistance test report for all Chip On Board products
• Request 1000h aging test data of the same batch before placing bulk order
• Confirm the color temperature tolerance range is within ±150K to avoid inconsistent light spot in the whole project

This article was generated by AI and is for reference only.