
Transistor/MOSFET
BSS138 MOSFET
The BSS138 is an N-Channel Logic Level Enhancement Mode Field Effect Transistor (MOSFET) in a compact SOT-23 package. It is ideal for low-voltage, low-current switching applications like load switching and signal amplification.
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Category
Transistor/MOSFET
Quality
100% Genuine
About BSS138 MOSFET
The BSS138 N-Channel MOSFET is a high-performance semiconductor device manufactured by onsemi, utilizing proprietary high cell density DMOS technology. Designed specifically for logic-level interfacing, this transistor operates efficiently with low gate drive requirements, making it perfect for microcontroller-based projects and low-power switching circuits. With a drain-source voltage rating of 50V and a continuous drain current of 220mA, it offers reliable performance for various electronic applications. The device features low on-resistance (Rds On) of approximately 3.5 Ohms, minimizing power loss during operation. Its small SOT-23 surface-mount package allows for compact PCB designs, making it a popular choice for modern electronics. Common applications include level shifting, load switching, motor control in small devices, and signal amplification in audio circuits. This MOSFET is widely used by hobbyists and professionals alike for its reliability, availability, and excellent performance-to-cost ratio in low-voltage applications.
Technical Specifications
| Part Number | BSS138 |
|---|---|
| FET Type | N-Channel |
| Technology | MOSFET (Metal Oxide) |
| Drain-Source Voltage (Vdss) | 50 V |
| Gate-Source Voltage (Vgss) | ±20 V |
| Continuous Drain Current (Id) | 220 mA |
| Pulsed Drain Current | 0.88 A |
| Drain-Source Resistance (Rds On) | 3.5 Ohms |
| Package Type | SOT-23 |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -55°C to 150°C |
| Status | Active |
Alternative Components
2N7000
BS170
IRF540N
IRFZ44N









