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The SMA6J18A-H is an automotive-grade unidirectional TVS diode rated at 600W peak pulse power with a 10/1000µs waveform. Qualified to AEC-Q101, it is designed to protect 18V DC power rails from load dump, inductive switching, and lightning-induced transients, providing fast response, low leakage, and stable clamping performance in a DO-214AC (SMA) package for automotive and industrial electronics.