P4SMA33A-Q is a unidirectional transient voltage suppressor diode designed for overvoltage transient protection in automotive and industrial applications. This device features a breakdown voltage range of 31.4 to 35.7 volts with a peak pulse power dissipation of 400 watts, housed in a compact DO-214AC (SMA) surface mount package. The diode exhibits fast response times of less than 1.0 picosecond and is AEC-Q101 compliant, RoHS compliant, and halogen-free, making it suitable for demanding automotive-grade applications. It is commonly used for protection of power buses, I/O interfaces, and in telecom, computer, industrial, and consumer electronics applications where reliable surge protection is essential.