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The SMB30J58A is a high-power unidirectional transient voltage suppression diode rated at 3000W peak pulse power with a 10/1000µs waveform. Housed in a DO-214AA (SMB) package, it is designed to protect 58V DC power rails from lightning-induced surges, load switching transients, and other overvoltage events, offering fast response time, low leakage current, and excellent clamping capability for industrial power and communication systems.