The SZBZX84B12LT1G is a zener diode manufactured by ON Semiconductor. It has a power rating of 250mW and a zener breakdown voltage of 12V. It is designed to regulate and protect circuits from variable input voltages. This diode is useful in many applications, such as voltage regulation, reverse polarity protection, and ESD protection. Its small size makes it easy to use in tight, space-limited applications. It has a maximum operating temperature of +125°C and a storage temperature range of -65 to +150°C.