The GT-SMD181215012-TR is a surface-mount surge arrestor designed for transient overvoltage protection. It features a D.C. firing voltage of 150V ±20% and can handle a maximum impulse current of 1KA with an 8/20μs waveform. Key characteristics include a maximum inter-electrode capacitance of 1.0 pF, an A.C. discharge current of 1A, and a minimum insulation resistance of 10^4 MΩ. This device is qualified against several MIL-STD 202 environmental specifications, making it a robust solution for protecting sensitive electronic circuits in various applications.