BSS138 N-Channel MOSFET | Futuretech Components
The BSS138 is a small-signal N-Channel MOSFET from onsemi, widely used in switching and level-shifting applications. Available at Futuretech Components, it ensures reliable sourcing and consistent quality.
BSS138 FAQ
What is BSS138?
The BSS138 is a reliable small-signal N-Channel MOSFET from onsemi. It features low on-resistance (Rds(on)) and fast switching characteristics, making it ideal for level-shifting circuits, load switching, and general-purpose low-voltage switching applications.How Does BSS138 Work?
This N-Channel MOSFET operates by allowing current to flow from the drain to the source when a sufficient voltage is applied to the gate relative to the source. It provides efficient switching with minimal conduction loss, making it suitable for high-speed digital circuits and low-voltage load control.What Package and Pin Configuration Does BSS138 Have?
The BSS138 is housed in a compact SOT-23 package, commonly used for surface-mount MOSFETs. It has three primary pins:Gate – Controls the MOSFET switching
Drain – Current flows to load when MOSFET is ON
Source – Common reference for gate voltage and return path
What Are the Advantages and Limitations of BSS138?
Pros:Low on-resistance (~3.5 Ω), ensuring minimal conduction loss
Fast switching suitable for level shifting and logic circuits
Compact SOT-23 package for space-saving PCB designs
Reliable for low-voltage switching applications (up to 50 V)
Cons:
Not suitable for high-current applications above 200 mA
Requires proper gate voltage to ensure full conduction
What Are Some Alternatives to BSS138?
Possible equivalent or alternative options include:2N7002 (ON Semiconductor)
PMV65EN (Vishay)
IRLML6344 (Infineon)
AO3400A (Alpha & Omega Semiconductor)
What Are the Common Applications of BSS138?
The BSS138 is widely used in embedded systems, logic level shifting, low-current load switching, and general-purpose digital circuits. It is commonly applied in IoT devices, sensor interfaces, microcontroller boards, communication modules, and compact electronic designs that require fast, reliable, and space-efficient MOSFET switching.Conclusion
For verified and authentic BSS138 MOSFETs, source directly from Futuretech Components — your trusted distributor of high-quality electronic components with global supply reliability. Futuretech Components provides quick delivery across Southeast Asia / Europe / North America.
