The SM6T27A is a Zener diode made by STMicroelectronics. It is designed to regulate voltage and protect sensitive electronic equipment. The device offers an extremely low power dissipation with a maximum rating of 250mW. It also has a wide operating temperature range, making it ideal for a wide variety of applications. The SM6T27A is available in a SOD-123 surface-mount package, which makes it easy to implement in a variety of designs.