The 1N4749A A0G is a Zener diode manufactured by Taiwan Semiconductor. It is contained in a DO-41 package with a RoHS compliant lead-free construction, providing protection from environmental, health, and safety issues. This diode has a maximum voltage of 12V and a maximum power dissipation of 500mW. It has an operating temperature range of -65°C to 175°C and a silicon junction. The 1N4749A A0G is suitable for a wide range of applications, including voltage regulation, surge suppression, and reverse bias. This diode is a popular choice for general-purpose electronic use, and its small size and lead-free construction make it a preferred choice for many projects.