Transistor 2N3819

Transistor 2N3819 N-Channel, 0.1A TO-92

Transistors

Reference: TR2N3819

Part.No: 2N3819

€1.00

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The 2N3819 is a general-purpose N-Channel JFET (Junction Field Effect Transistor) in a TO-92 package. Designed for VHF/UHF RF amplification, mixing and low-noise analog switching in hobbyist and audio circuits.

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Description
Product Details

2N3819 N-Channel JFET - Low-Noise RF Amplification & Analog Switching

The 2N3819 is a depletion-mode N-Channel JFET widely used since the 1960s in RF front-ends, audio preamps and analog switch circuits. Its voltage-controlled operation, low gate leakage and low-noise characteristics make it a classic choice for hobbyist VHF/UHF amplifiers, mixers, and field-effect signal detectors built around 555 timers or discrete op-amp stages.

Functions & Applications

Depletion-Mode N-Channel JFET: Conducts at zero gate bias, ideal for simple self-biased amplifier stages.
Low Noise, High Gain: Well suited to RF front-ends, audio preamps and sensitive signal-detector circuits.
VHF/UHF Capable: Usable in amplifier and mixer designs up to roughly 450MHz.
Standard TO-92 Package: Easy through-hole soldering, breadboard and prototyping friendly.
High Input Impedance: Voltage-controlled gate draws negligible current, minimizing loading on the previous stage.

Technical Specifications

Parameter	Value / Specification
Transistor Type	FETs (Field-Effect Transistors)
Polarity / Channel	N-Channel
Package / Case	TO-92
Drain-Source Voltage (VDS)	25V
Max Drain Current (ID)	100mA
Total Power Dissipation (PD)	350mW
Forward Transconductance (gfs)	≥2,000 μmhos (min)
Gate-Source Cutoff Voltage (VGS(off))	≤8V (max)
Mounting Type	Through-Hole (THT)

Frequently Asked Questions

Q: What is the 2N3819 mainly used for?
A: It is a depletion-mode N-Channel JFET commonly used in RF/VHF amplifiers, mixers, low-noise audio preamps and simple field/charge detector circuits, thanks to its high input impedance and low noise.

Q: What is a common substitute for the 2N3819?
A: The MPF102 N-Channel JFET is frequently used as a near-equivalent substitute in general-purpose RF and amplifier circuits, though exact parameters should be checked against your design's requirements.

Note: Price refers to one (1) piece. The component is shipped in bulk without individual packaging.

Transistor Type: FETs (Field-Effect Transistors)
Transistor Polarity / Channel: N-Channel
Transistor Case Style: TO-92

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