How to Use 2N3819? [Video]

2N3819 Pinout

Symbol

2N3819 Symbol

Footprint

2N3819 Footprint

3D Model

2N3819 3D Model

2N3819 is an N-channel Junction Field Effect Transistor with a wide range of applications. It operates in depletion mode and must be turned off with reverse biasing. It is intended for medium to high-frequency ranges. It also has a high gain for wideband frequencies and is useful in VHF/UHF-based systems. It is a low-noise small-signal device capable of fast switching, signal amplification, and mixing.

2N3819 Alternatives

The alternatives for 2N3819:

• 2N4416

• 2SK162

• 2N5638

• NTE312

This N-channel JFET is only suitable for low-side switching. Because N-channel FETs are only used to power low-side power paths. However, any other P-channel JFET can be used to drive a high-side load. Another thing to keep in mind is that the drain current of the 2N3819 JFET is 100mA. As a result, it will be used for an application requiring less than 100mA drain current.

The following circuit illustrates the use of a 2N3819 JFET as a switch. To measure the voltage across the Drain terminal, a DC voltmeter is connected between the Drain and source terminals.

2N3819 As a Switch

When a zero voltage is applied to the Gate terminal of an N-channel JFET, the FET enters saturation mode and behaves like a closed circuit, with almost zero voltage appearing across the Drain terminal as shown on the DC voltmeter.

Similarly, when a sufficiently negative voltage is applied to the Gate terminal of an N-channel JFET, the FET operates in the cut-off region and acts as an open circuit, as indicated by the DC voltmeter.

2N3819 As a Field Detector

It will describe how the 2N3819 N-Channel JFET works as a field detector. To supply voltage to the 555 Timer IC, the transistor source terminal is connected to a 6-12 Volt power source. The IC is also linked to an LED, which illuminates when the timer is activated, and a buzzer, which emits sound whenever a signal is detected. To detect the AC field, an antenna is connected to the gate of 2N3819. When the antenna detects a charge or a wave, it generates a voltage and sends it to the gate terminal. A change in gate voltage modifies ID and activates the Timer IC.

As a result, the led begins to blink, indicating that the IC has been activated, and the buzzer makes a sound to indicate that a charge has been detected by the antenna

2N3819 Package

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