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The SMB10J120A is a unidirectional transient voltage suppression diode rated at 1000W peak pulse power with a 10/1000µs waveform. Designed for 120V DC power lines, it provides fast response, low leakage current, and reliable clamping performance. The SMB (DO-214AA) package makes it suitable for compact PCB layouts in industrial control, power supplies, communication equipment, and general high-voltage DC surge protection applications.