The BDFN2C051V40 is a Transient Voltage Suppressor (TVS) Diode made by the company Bourne. It has a low capacitance and high surge-handling capability, designed for ESD, EFT, and surge protection. It is made in a small DFN-2L (Dual Flat No-Lead) package, measuring 2.1x1.6x0.7mm, and has a nominal working voltage of 6.9V, Absolute Maximum Ratings of 6V and 5V respectively, and is RoHS compliant.