The PESD5V0S1BB is an ESD protection device made by HXY MOS. It comes in a SOD-523 package and is RoHS compliant. It is designed to provide 9V and 5V bi-directional protection. The protection is provided by two 4kV ESD protection components which have a fast response time, a low clamping voltage, and are suitable for a wide range of applications. The device also features low power consumption and is certified by IEC 61000. It can be used in a wide variety of scenarios, including industrial, military, automotive, and medical systems.