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P4200DA is a bidirectional Thyristor Surge Suppressor (TSS) designed to protect sensitive communication and industrial electronic circuits against transient overvoltage events. It features a 400V peak off-state voltage (VDRM), fast nanosecond response, low leakage current, and excellent surge handling capability. The compact SOD-123FL package enables reliable protection while minimizing PCB space, making it suitable for high-reliability telecom and industrial applications.