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MPF102 from FAIRCHILD,Fairchild Semiconductor

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MPF102

Manufacturer: FAIRCHILD, FSC, MOTOROLA-FAI

N-Channel RF Amplifier

Partnumber Manufacturer Quantity Availability
MPF102 FAIRCHILD, FSC, MOTOROLA-FAI 2173 In Stock

Description and Introduction

N-Channel RF Amplifier # Introduction to the MPF102 Transistor  

The MPF102 is a widely used N-channel junction field-effect transistor (JFET) designed for general-purpose amplification and switching applications. Known for its reliability and ease of use, this component is commonly found in radio frequency (RF) circuits, audio amplifiers, and signal processing systems.  

As a depletion-mode device, the MPF102 operates with a negative gate-to-source voltage, making it suitable for applications requiring low noise and high input impedance. Its typical parameters include a drain-source voltage (VDS) of up to 25V, a gate-source cutoff voltage (VGS(off)) ranging from -0.5V to -6V, and a drain current (IDSS) between 2mA and 20mA.  

The MPF102 is often used in high-frequency circuits due to its favorable gain-bandwidth characteristics. It is also valued in analog designs for its ability to function as a voltage-controlled resistor or a buffer amplifier. While newer MOSFETs and other semiconductor technologies have emerged, the MPF102 remains a practical choice for hobbyists and engineers working on legacy or cost-sensitive projects.  

When implementing the MPF102, proper biasing and static discharge precautions should be observed to ensure optimal performance. Its TO-92 package allows for easy breadboard prototyping, making it a versatile component for experimentation and circuit development.  

Overall, the MPF102 continues to serve as a fundamental building block in electronic design, particularly in applications where simplicity and stable performance are key considerations.

Application Scenarios & Design Considerations

N-Channel RF Amplifier

Alternative Part Number

  • J113 --: N-channel JFET with similar low-noise small-signal characteristics, widely used as a direct substitute for MPF102 in amplifier and switching circuits.
  • 2N5457 --: General-purpose N-channel JFET with comparable VGS(off) and IDSS ranges, commonly interchanged with MPF102 in RF and audio front ends.
  • BF256B --: N-channel JFET offering similar transconductance and low-noise performance, suitable replacement where MPF102 availability is limited.

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