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YBZ3D200J is a high power planar silicon zener diode rated at 200V with continuous 3W dissipation capability. It features low dynamic impedance at high breakdown voltages for stable clamping under load variation, excellent thermal performance enabled by the SMB package for sustained industrial operation, and fast transient response to suppress repetitive surge stress. It is widely used in high voltage SMPS outputs, industrial DC bus protection, inverter control circuits, and surge limiting networks.