BZX84C22_R1_00001, manufactured by Panjit, is a Zener diode in a 3K-ohm, standard SOT-23 (Small Outline Transistor, or surface-mount transistor) package. It is a ZSM-04T, ZSM04-QI05 series device, and is a Zener diode specifically designed to protect circuits from overvoltage or electrostatic discharge (ESD). It is a dual-bi-directional device with a working voltage of 7 V, and peak reverse voltage of 5 V. It is ideally suited for low-voltage applications such as embedded systems, notebook PCs, or mobile electronics.