P4SMAJ64A-AQ is an SMD transient voltage suppressor diode designed for overvoltage and ESD protection in commercial and industrial applications. This unidirectional device features a standoff voltage (VWM) of 64 V with a breakdown voltage (VBR) of approximately 78.9 V, delivering peak pulse power dissipation of 400 W at a 10/1000 µs waveform. The diode exhibits very fast response time and is housed in an SMA (DO-214AC) package with typical thermal resistance of 70 K/W junction-to-ambient and 30 K/W junction-to-terminal. The -AQ suffix indicates AEC-Q101 qualification, ensuring automotive-grade reliability. It is ideal for protecting sensitive circuits against transient overvoltages, free-wheeling applications, and ESD events in industrial and commercial equipment.