MMBZ5229B is a dual-color diode, often used as a protection diode to prevent reverse current and voltage in DC circuits. It is manufactured by DC Components and features glass-passivated junctions, high temperature soldering capability, and low power loss, high efficiency, and high reliability. It has a maximum forward current rating of 100mA, a reverse voltage rating of 5V, and maximum peak reverse power dissipation of 500mW. The device is typically used to protect data lines in computer systems, and various other consumer electronics.