STPS340S is an affordable, high-efficiency, and low-loss discrete Type 2 surge-protection device offered by STMicroelectronics. This device is specifically designed to protect AC power lines such as those found in home and industrial applications against transients, such as lightning strikes and surge events. Its wide operating voltage, ranging between 4.0 V and 16 V, and over-temperature protection allows it to protect against the most severe transient conditions. Its low on-state resistance and fast recovery time, together with an industry-leading clamping voltage, enable reliable and complete suppression of over-voltage conditions without compromising system performance or reliability.