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The P4SMF54A is a unidirectional transient voltage suppression diode engineered for reliable surge protection in 54V DC systems. Rated at 400W peak pulse power (10/1000µs), it delivers fast response and stable clamping against lightning surges, switching transients, and induced overvoltage events. The compact SOD-123FL package supports space-efficient PCB layouts in industrial power supplies and control equipment.