The 1N5253B, a Zener Diode manufactured by CDIL, is a 500mW, 25V Diode in an ammunition package (DO35) with a reverse leakage current of 0.1uA. This diode is commonly used in voltage regulation, protection circuits and surge suppressors. It provides a stable, relatively low impedance path between the anode and cathode terminals that effectively clamps high voltage, withstanding positive and negative transients.