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YAZ1P5D180 is a high reliability planar silicon zener diode rated at 180V with continuous 1.5W power dissipation capability. It features controlled dynamic impedance to maintain stable clamping under load variations, excellent thermal performance enabled by SMA package structure, and fast transient response for surge suppression. The device is widely used in high voltage SMPS secondary outputs, industrial DC bus protection, voltage reference networks, and transient limiting circuits in power conversion systems.