MMBF5485 Discrete Semiconductor Products

MMBF5485 Application Field and Working Principle

The MMBF5485 is an N-channel junction field effect transistor (JFET) for use in RF applications. It has an unusually wide frequency range, with an upper range limit of 5000MHz, making it an excellent choice for a variety of applications. This article will discuss the application field, working principle and features of the MMBF5485.

Application Field

The MMBF5485 is designed for use in radiofrequency (RF) applications. It is typically used to achieve high-frequency oscillations in circuits. Its wide frequency range and low input power requirement also make this JFET well-suited for use in television receivers, computers, radios and other electronic devices. Additionally, its low input capacitance and high breakdown voltage make it an ideal component for high-precision applications.

Working Principle

The MMBF5485 is an N-Channel JFET, which means that it has an N-type Gate and an N-type channel between the Gate and the Drain. At a certain point, known as the pinch-off voltage, no current can flow through the channel and the transistor is said to be “OFF”. When a positive voltage is applied to the Gate terminal, the channel opens and the transistor is said to be “ON”. This allows the current to flow between the Gate and the Drain and the output voltage, at the Drain terminal, depends on the Gate voltage.

Features

The MMBF5485 has a wide range of features, including:

• High frequency range (up to 5000MHz)
• Low input capacitance (0.7pF)
• Low noise figure (2dB)
• Low gate-source capacitance (0.7pF)
• High breakdown voltage (–25V)

These features make the MMBF5485 an excellent choice for RF applications. It can be used to achieve high-frequency oscillation and its low capacitance makes it well-suited for high-precision applications.