BSS138 is a small signal N-channel MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) that is commonly used in low-voltage switching applications. It is a surface-mount device that is available in a small SOT-23 package.
The BSS138 MOSFET has a maximum drain-source voltage rating of 50V and a maximum drain current rating of 220mA. It also has a low on-resistance, with a typical Rds(on) of 3.5 ohms and a maximum of 5 ohms.
Because of its low on-resistance and low gate threshold voltage, the BSS138 MOSFET is frequently used in low-voltage switching applications such as DC-DC converters, load switches, and motor control circuits.
When using the BSS138 MOSFET or any other MOSFET in a circuit, it's important to pay attention to its pinout and operating parameters to ensure that it is properly biased and operates within its safe operating limits.
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