Tianjin Zhonghuan Semiconductor Joint-stock Co., Ltd. is the most powerful manufacturer of discrete semiconductor devices in mainland and almost takes the same place with the champion in the world.

One of our main products is MWO High Voltage Diode. Its quality has reached international advanced level. In 1994,the company passed ISO9002:1994 product system approval. In 2003,the company passed ISO9001:2000 quality system approval.

Its production and sales amount has ranked the third place in the world and hopefully get the champion recent years.