The MMSZ5242B-E3-08 from Vishay is a small signal Zener diode with a breakdown voltage of 12V, a rated power of 0.5W, and a tolerance of 5%. It is a double didoe configuration, which offers improved electrical properties and better reverse power dissipation compared to single diode designs. It is available in SMD packages and it is intended for use in voltage and frequency regulation applications. It can handle reverse current up to 30 mA and can produce a low noise and flicker free output.