The 1SMA5918A with Zener Diodes SMA RoHS manufactured by LGE is a type of semiconductor device. It is a switching diode, and it is designed to protect circuits from voltage spikes or power surges. The device consists of a junction of two layers of semiconductor materials: the anode and the cathode. The breakdown voltage of the diode is 5.9 volts. It is housed in a SMA hermetically-sealed package, which complies with the EU's Restriction on Hazardous Substances (RoHS) directive. The device can handle high operating currents, up to 225mA, and has a maximum power dissipation of 500mW. It is suitable for high-speed switching applications, as well as for use in power supplies, motor control systems, and remote control systems.