The 1SMA5953BAT is a SMA zener diode manufactured by Agertech that is compliant with the Restriction of Hazardous Substances (RoHS) directive. This diode is designed for use in voltage regulation applications. It features an anode voltage of 5.1V and a breakdown voltage of 4.7V. It also has low dynamic impedance and low leakage current, making it suitable for applications such as voltage clamping, transient voltage suppression, voltage regulation, and overvoltage protection. The device is also compliant with the RoHS directive, meaning it does not contain hazardous materials such as lead or mercury. It is suitable for use in most modern electronic products.