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The SM6K40A is a high-reliability 6600W unidirectional TVS diode engineered for transient overvoltage protection on 40V DC power lines. Utilizing a 10/1000µs waveform rating and housed in a DO-218AB package, it delivers excellent surge absorption, fast response, and low leakage performance. Typical applications include automotive electronics, industrial power supplies, communication systems, and energy infrastructure.