The BSS138 is a small signal N-channel MOSFET transistor mainly used for low power applications. It features a low threshold voltage of 1.3V, making it suitable for low voltage circuits. The BSS138 has a maximum drain-source voltage of 50V and a continuous drain current rating of 200mA, making it ideal for switching and amplification tasks in various electronic devices. It comes in a compact SOT-23 package, making it easy to integrate into small circuit designs. The BSS138 has a fast switching speed and low on-resistance, which enhances its performance in high-speed switching applications.Overall, the BSS138 is a versatile discrete semiconductor component that offers reliable performance in low power circuits