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The P4SMF85A-H is a high-reliability unidirectional transient voltage suppression diode designed for severe surge protection in high-voltage DC systems. Rated at 400W peak pulse power (10/1000µs) and qualified to AEC-Q101, it provides fast response and stable clamping against lightning surges, load dump events, and switching transients. The compact SOD-123FL package enables reliable PCB integration in automotive, industrial control, and power supply applications.