The ABZT52C3V9-HF is a zener diode from Comchip Technology. It is a surface mountable diode that comes in a SOD-123 package. The diode is part of the automotive series and is designed to meet the AEC-Q101 standard. It has a zener voltage of 3.9V with a tolerance of ±5.13%. The maximum forward voltage drop is 900mV at 10mA. The diode has a maximum power dissipation of 500mW and a maximum reverse leakage current of 3μA at 1V. The ABZT52C3V9-HF is suitable for various applications that require voltage regulation and protection. It has an impedance of 90 Ohms, making it ideal for use in electronic circuits.