The 1SMA5917A is a series of Zener Diodes manufactured by LGE with RoHS compliance. It is a surface mount, single-phase diode featuring low forward voltage, low reverse current, high power dissipation, and high stability. It has a reverse breakdown voltage of 5.9V with ±5% tolerance, an operating junction temperature range between -55°C and 125°C. The maximum power dissipation rate is 500mW. It is a small-signal diode with a wide range of applications that include voltage regulation, switching, over current protection, and monitoring circuits. It is widely used in consumer electronics, automotive, and industrial equipment.