BSS138LT1 N-Channel Power MOSFET 200mA 50V SOT−23

BSS138LT1 N-Channel Power MOSFET 200mA 50V (SOT−23) delivers efficient switching and low-power control for compact electronic designs. Engineers and hobbyists use this MOSFET in battery-powered circuits, load switches, and signal amplification due to its high-speed performance and miniature footprint.

Key Features:

• Low Threshold Voltage: Enables control with minimal gate drive power.
• Fast Switching Speed: Reduces power loss in high-frequency applications.
• SOT-23 Package: Saves space on PCBs for portable and IoT devices.
• Low On-Resistance: Maximizes efficiency at 200mA loads.
• ESD Protection: Guards against electrostatic discharge damage.

Technical Specifications:

• Drain-Source Voltage (V_DS): 50V
• Continuous Drain Current (I_D): 200mA
• On-Resistance (R_DS(on)): 3.5Ω (max) at V_GS=4.5V
• Gate-Source Voltage (V_GS): ±12V (max)
• Power Dissipation (P_D): 225mW

Mechanical Specifications:

• Package Type: SOT-23 (Surface-Mount)
• Termination: Tin-plated leads (Pb-free)
• Moisture Sensitivity: Level 1 (MSL1)

Dimensions:

• Package Length: 2.9mm (max)
• Package Width: 1.3mm (max)
• Lead Pitch: 0.95mm

Pinout and Wiring:

• Pin 1 (Gate): Controls switching via voltage input.
• Pin 2 (Source): Connects to ground/common return.
• Pin 3 (Drain): Output to load; handles up to 50V.
• For basic switching, apply voltage to Pin 1 (Gate) relative to Pin 2 (Source).

Datasheet Reference:

• Search “BSS138LT1 datasheet PDF” for detailed curves, test circuits, and thermal guidelines.

Applications:

• Battery Management: Protects circuits from reverse polarity or overcurrent.
• Signal Switching: Routes low-power analog/digital signals in multiplexers.
• Portable Electronics: Powers LED drivers, sensors, and wearables efficiently.
• Automotive Modules: Supports 12V/24V system controls (within specs).

Equivalent Models:

• 2N7002: Similar N-Channel MOSFET (60V, 115mA).
• DMG2302UX: Lower R_DS(on) alternative (20V, 2.7A).
• NDS355AN: Higher current (1.7A) SOT-23 option.

Package Includes:

• 1 x BSS138LT1 N-Channel MOSFET (SOT-23)