SMCJ12A-Q is a unidirectional transient voltage suppressor diode designed for overvoltage transient protection in automotive and industrial applications. It features a 12V working peak reverse voltage (VRWM) with a breakdown voltage of approximately 13.5V, housed in a compact DO-214AB (SMC) surface mount package. The device delivers 1500W peak power dissipation capability with typical response times less than 1.0 picosecond from 0V to breakdown voltage, and is AEC-Q101 compliant for automotive-grade reliability. It is RoHS compliant and suitable for protecting power buses, I/O interfaces, and various telecom, computer, industrial, and consumer electronics applications where fast transient suppression is critical.