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The SMF70A is a unidirectional transient voltage suppression diode designed to protect 70V DC power rails from lightning surges, load switching spikes, and other transient overvoltage events. Rated at 200W peak pulse power with a 10/1000µs waveform, it features fast response time, low clamping voltage, and stable electrical characteristics. The compact SOD-123FL package makes it ideal for industrial control systems, communication equipment, and power supply protection.