These 0.5 W zener diodes are electrically equivalent to the 1N5221B - 1N5272B series diodes. They are compatible with all wire bonding and die attach techniques with the exception of solder reflow. Die Rev. V1 Electrical Specifications: TA = +25°C Part # Zener Voltage VZ @ IZT (Note 1 & 3) Nomi.