The P4SMAJ70CA-AQ is a bidirectional SMD transient voltage suppressor diode designed for overvoltage and ESD protection in commercial and industrial applications. It features a standoff voltage (VWM) of 70 V with a breakdown voltage (VBR) of approximately 84.4 V, delivering peak pulse power dissipation of 400 W at a 10/1000 µs waveform. The device exhibits very fast response time and is housed in an SMA (DO-214AC) surface-mount package, with a maximum junction temperature of 150°C and typical thermal resistance of 70 K/W junction-to-ambient. The -AQ suffix indicates AEC-Q101 qualification, ensuring automotive-grade reliability. This diode is ideal for protecting sensitive circuits against transient overvoltages, free-wheeling applications, and ESD events in industrial and commercial equipment.