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Unlike conventional methods that require complex circuits to connect multiple LED chips, the MJT series is designed to operate at different voltages and can be driven at high voltage using only one LED chip that is multi-junction technology connected. Using an LED chip instead of multiple LED chips reduces the failure rate, and the optimized chip design helps achieve a breakthrough of 100lm/W. 
MJT Series 3528 Package 
COB type LED MJT chip Connects many chips Multi-cell integrated chip
About Acrich
Acrich is the world's first LED that can operate not only under DC voltage, but also with AC power under multi-junction technology.
About MJT (Multi-junction technology)
MJT means multi-P/N junction technology, which has a higher driving voltage than conventional LEDs. The high-voltage LEDs on the market are actually a series of LED chips connected in series, and the circuit design is complicated. MJT uses multi-cell integration technology in the same chip to obtain different voltage types. 
Seoul Semiconductor MJT series products have up to 100lm/W commercial lighting performance
Seoul Semiconductor announced that it will accelerate the sale of MJT (Multi-Junction Technology) series products, which use Seoul Semiconductor's integrated Acrich technology. One of the advantages of MJT series products is its 5630 and 3528 packages, making it easier for LED lighting manufacturers to produce. The standard (module) size gives the lighting fixtures world-class performance of 100 lm/W.