BS170

The BS170 is a popular N-channel MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) manufactured by ON Semiconductor. It is widely used in various electronic applications due to its versatility and efficiency.

Key Features:

1. Type: N-channel MOSFET
2. Package: Typically available in a TO-92 package, which is a cylindrical plastic package with three leads, making it easy to handle and mount on PCBs.
3. Voltage Rating: The BS170 has a maximum drain-source voltage (V_DS) of around 60 volts, allowing it to be used in a variety of low to moderate voltage applications.
4. Current Rating: It can handle a continuous drain current (I_D) of approximately 500 mA, making it suitable for switching and amplification tasks in low-power circuits.
5. Gate Threshold Voltage (V_GS(th)): The gate threshold voltage is typically between 2 to 4 volts, which means it begins to conduct when the gate-source voltage exceeds this range.
6. R_DS(on): The on-resistance (R_DS(on)) is low, typically around 3 ohms at a gate-source voltage of 10V, which contributes to its efficiency by minimizing power loss during operation.
7. Switching Speed: The BS170 is capable of fast switching speeds, making it ideal for applications in digital circuits and signal processing.

Applications:

• Switching Circuits: Commonly used in low-power switching applications, such as turning on/off loads in electronic devices.
• Amplifiers: Can be used in small-signal amplification circuits due to its high input impedance and low output capacitance.
• Level Shifting: Useful in interfacing between different voltage levels in digital circuits.
• Relay Drivers: Often employed to drive relays in various control applications.

Electrical Characteristics:

• Gate-Source Voltage (V_GS): Maximum rating is typically ±20V.
• Thermal Resistance: The junction-to-ambient thermal resistance is relatively low, allowing for efficient heat dissipation during operation.
• Operating Temperature Range: The BS170 can operate in a wide temperature range, typically from -55°C to +150°C, making it suitable for various environmental conditions.

Conclusion:

The BS170 from ON Semiconductor is a reliable and efficient N-channel MOSFET that is widely used in electronic circuits for switching and amplification. Its favorable electrical characteristics, compact package, and versatility make it a go-to choice for engineers and hobbyists alike in designing low-power electronic applications.