The BSS138-7-F is a N-channel, logic level enhancement mode field-effect transistor (FET) that is commonly used in small signal switching applications. It has a maximum drain-source voltage of 50V and a continuous drain current of 220mA. This transistor has a low threshold voltage of 1.5V, making it suitable for low voltage circuits. The BSS138-7-F is housed in a SOT-23 package, which is a popular surface mount package for small signal transistors. This component is RoHS compliant, making it environmentally friendly. Overall, the BSS138-7-F is a reliable and versatile discrete semiconductor component that is commonly used in a variety of electronic circuits