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YAZ2D200 is a high reliability planar zener diode rated at 200V with 2W continuous power dissipation capability. It features low dynamic impedance for stable voltage control under varying load currents, excellent thermal performance for sustained operation, and strong surge handling capability for transient overvoltage events. The device is widely applied in industrial power supplies, AC-DC converter secondary regulation, high voltage reference networks, and protection circuits requiring robust voltage stabilization.