Surface mount TVS 1.5SMC550A/1.5SMC550CA is produced by DOWOSEMI, and its quality is comparable to international brands ( such as: Vishay, ON, Littlefuse and so on; ) . DOWOSEMI is a professional TVS manufacturer. Its advantages include these:  a variety of models, complete strength inventory, lightning delivery, excellent quality, free EMC testing, free solution, free sample!