Panasonic MAZ4000 Series handbook
Datasheet
The MAZ4000 series (MA4000 series) is a silicon planar type zener diode used for power supply stabilization. Its features are high reliability, the ability to be inserted into a 5 mm pitch hole, finely divided zener-voltage ranks, sharp rising performance, and a wide voltage range (VZ = 2.0 V to 39 V).
