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The BSS138K is an N-channel MOSFET manufactured by ON Semiconductor. Below are its key specifications, descriptions, and features:

Specifications:

• Drain-Source Voltage (VDS): 50V
• Gate-Source Voltage (VGS): ±20V
• Continuous Drain Current (ID): 220mA
• Pulsed Drain Current (IDM): 800mA
• Power Dissipation (PD): 360mW
• On-Resistance (RDS(on)): 3.5Ω (max) @ VGS = 10V
• Threshold Voltage (VGS(th)): 0.8V to 2.5V
• Input Capacitance (Ciss): 25pF (typ)
• Output Capacitance (Coss): 6pF (typ)
• Reverse Transfer Capacitance (Crss): 2.5pF (typ)
• Operating Temperature Range: -55°C to +150°C

Description:

The BSS138K is a small-signal MOSFET designed for low-voltage, high-speed switching applications. It is optimized for low on-resistance and fast switching performance, making it suitable for power management, load switching, and signal amplification in portable and battery-powered devices.

Features:

• Low Threshold Voltage: Enables efficient operation in low-voltage circuits.
• Fast Switching Speed: Suitable for high-frequency applications.
• Low On-Resistance: Reduces power loss and improves efficiency.
• Small Package (SOT-23): Space-saving design for compact PCB layouts.
• ESD Protection: Robust against electrostatic discharge.
• Lead-Free & RoHS Compliant: Environmentally friendly.

This MOSFET is commonly used in DC-DC converters, load switches, battery protection circuits, and signal switching applications.