Transistor BF244 N-Channel JFET, TO-92

Transistor BF244 N-Channel JFET, TO-92

Transistors

Reference: TRBF244

Part.No: BF244

€1.20

In Stock

Immediate Dispatch

The BF244 is a high-performance N-Channel JFET in a TO-92 package. Voltage-controlled with ultra-high input impedance, ideal for low-noise signal amplification, RF/VHF applications, and sensitive sensor interfaces.

Add to cart

Subscribe To When In Stock

You have successfully subscribed to this product

Description
Product Details

BF244 N-Channel JFET – Ultra-High Impedance for RF & Low-Noise Amplification

The BF244 is an N-Channel JFET, a voltage-controlled transistor with a Gate, Source, and Drain terminal. Unlike BJTs, it draws virtually no input current, providing exceptional input impedance—perfect for interfacing with high-impedance sources such as condenser microphones, guitar pickups, and piezoelectric sensors without signal degradation.

Functions & Applications

Massive Input Impedance: Gate current negligible; never loads down the source signal, essential for high-impedance sensor interfaces.
Voltage-Controlled Operation: Gate-to-Source voltage directly controls drain current with no base current required, similar to a vacuum tube.
Low Noise: Excellent for preamplifiers, audio, and precision measurement applications.
VHF/RF Performance: Superior high-frequency characteristics with stable gain across RF bands.

Technical Specifications

Parameter	Value / Specification
Transistor Type	FETs (Field-Effect Transistors)
Polarity / Channel	N-Channel
Package / Case	TO-92
Gate-Source Voltage (Vgs)	−4V to 0V (typical pinch-off)
Maximum Drain-Source Voltage (Vds)	30V
Maximum Drain Current (Idss)	30mA
Mounting Type	Through-Hole (THT)

Frequently Asked Questions

Q: How do I test a BF244 JFET with a multimeter?
A: Unlike BJTs, the JFET drain-source channel will measure as low or variable resistance depending on gate bias. A proper test requires applying a gate voltage and measuring drain current; simple continuity tests may not reveal a faulty device.

Q: What is the main advantage of the BF244 over a BJT like BC547?
A: The BF244's gate draws virtually no input current (picoamps), whereas a BJT base requires significant base current. This makes the JFET ideal for high-impedance sensor interfaces and low-noise preamps where you cannot afford to load the source.

Notes

The BF244 is a classic RF JFET still widely used in vintage audio preamps, microphone circuits, and RF front-ends. Source impedance matching and proper biasing are crucial for optimal performance.

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

16 other products in the same category:

Power Transistor AD162 PNP, TO-66

Transistors

Power Transistor AD162 PNP, TO-66

Reference:

TRAD162

The AD162 is a classic PNP Germanium Power Transistor in a TO-66 package. Legendary for push-pull audio output stages in vintage amplifiers from the 1960s–1970s, prized by restorers and audio enthusiasts for its warm, natural tone.

In Stock

Transistor BC172 NPN 25 V 100 mA 300 mW TO-92

Transistors

Transistor BC172 NPN, 0.1A TO-92

Reference:

TRBC172

The BC172 is a general-purpose NPN Bipolar Junction Transistor (BJT) in a TO-92 package. Suited for small-signal amplification and low-power switching in audio preamps, hobbyist circuits and general-purpose electronics.

Last items in stock

Transistor BC211 NPN 40 V, 1A, TO39

Transistors

Transistor BC211 NPN, 1A TO-39

Reference:

TRBC211

The BC211 is an NPN Bipolar Junction Transistor (BJT) in a metal-can TO-39 package, rated for 40V and 1A. Suitable for general-purpose amplification and switching where a rugged metal case is preferred.

Last items in stock

Power Transistor 2SC1096 NPN, 3A TO-202

Transistors

Power Transistor 2SC1096 NPN, 3A TO-202

Reference:

TR2SC1096

The 2SC1096 is a reliable NPN power transistor in a TO-202 package, designed for high-current switching and audio amplification. With a maximum collector current of 3A and sturdy construction, it is well-suited for driving loads and building compact power amplifiers.

In Stock

Transistor BD204 PNP, 60V, 8A, 60W, TO-220

Transistors

Power Transistor BD204 PNP, 8A TO-220

Reference:

TRBD204

The BD204 is a PNP power Bipolar Junction Transistor (BJT) in a TO-220 package, rated for 60V and 8A. Designed for audio power amplifier output stages, motor drivers and general-purpose high-current switching.

Last items in stock

Transistor BC237 NPN, 45V, 0.1A, TO-92

Transistors

Transistor BC237 NPN, 0.1A TO-92

Reference:

TRBC237

The BC237 is a general-purpose NPN Bipolar Junction Transistor (BJT) in a TO-92 package. Suited for small-signal amplification and low-power switching in hobby, educational and general-purpose electronics.

In Stock

Power Transistor BD809 NPN, 12A TO-220

Transistors

Power Transistor BD809 NPN, 12A TO-220

Reference:

TRBD809

The BD809 is a high-linearity NPN Power BJT in a TO-220 package, designed specifically for audio amplifier output stages. Ideal for push-pull configurations paired with the complementary BD810 PNP transistor.

In Stock

Transistor 2SC1815 NPN, 0.15A TO-92

Transistors

Transistor 2SC1815 NPN, 0.15A TO-92

Reference:

TR2SC1815

The 2SC1815 is a classic NPN Bipolar Junction Transistor (BJT) in a TO-92 package. Renowned for audio preamplification and general-purpose switching, it remains an industry standard for analog signal processing and low-power applications.

In Stock

Transistor AF180 PNP, UHF TO-72

Transistor AF180 PNP, UHF TO-72 2

Transistors

Transistor AF180 PNP, UHF TO-72

Reference:

TRAF180

The AF180 is a classic PNP Germanium BJT in a TO-72 package with shield. Originally designed for UHF TV receiver front-end amplification and mixing stages, it remains a reliable replacement part for vintage television and radio equipment.

Last items in stock

Transistor 2SC1417 NPN, 0.2A TO-92

Transistors

Transistor 2SC1417 NPN, 0.2A TO-92

Reference:

TR2SC1417

The 2SC1417 is an NPN Bipolar Junction Transistor (BJT) in a TO-92 package, optimized for high-frequency (VHF) and RF applications. Perfect for oscillators, RF amplifiers, and frequency-dependent circuit designs where switching speed and gain stability matter.

In Stock

Transistor 2SD879 NPN Darlington, TO-92

Transistors

Transistor 2SD879 NPN Darlington, TO-92

Reference:

TR2SD879

The 2SD879 is a high-gain NPN Darlington transistor in a TO-92 package. Engineered for applications requiring massive current amplification, such as relay drivers, motor control, and high-impedance signal switching.

Last items in stock

Power Transistor BD530 PNP, 4A TO-220

Transistors

Power Transistor BD530 PNP, 4A TO-220

Reference:

TRBD530

The BD530 is a PNP power transistor in a TO-220 package, engineered for medium-power switching and amplification. Ideal as the complementary pair to the BD529 NPN transistor in push-pull amplifiers, audio drivers, and high-side load switching applications.

Last items in stock

Transistor BC637 NPN, 60V, 1A, TO-92

Transistors

Transistor BC637 NPN, 1A TO-92

Reference:

TRBC637

The BC637 is a medium-power NPN Bipolar Junction Transistor (BJT) in a TO-92 package, rated for 60V and 1A. Suitable for driving relays, motors and moderate-load switching in general-purpose electronics.

Last items in stock

Transistor BF679 PNP, 30mA TO-50

Transistors

Transistor BF679 PNP, 30mA TO-50

Reference:

TRBF679

The BF679 is a silicon PNP RF/UHF transistor in a TO-50 (SOT-37) metal can package. Designed by Telefunken/AEG for mixer and local-oscillator stages in UHF tuner front-ends, typically found in older analog TV channel-selector boards.

In Stock

Dual-Gate MOSFET BF981 N-Channel SOT-103

Transistors

Dual-Gate MOSFET BF981 N-Channel SOT-103

Reference:

TRBF981

The BF981 is a high-performance N-Channel Dual-Gate MOSFET in a SOT-103 package, specifically engineered for ultra-low-noise preamplification in VHF and FM receiver applications. Its exceptional noise figure and dual-gate isolation make it the preferred choice for LNA (Low Noise Amplifier) designs where signal integrity is critical.

Last items in stock

Transistor 2SC536 NPN, 0.1A TO-92

Transistors

Transistor 2SC536 NPN, 0.1A TO-92

Reference:

TR2SC536

The 2SC536 is a general-purpose NPN Bipolar Junction Transistor (BJT) in a TO-92 package. Reliable and easy to use, it is ideal for switching and amplification in amateur electronics, prototyping and educational projects.

In Stock

Product added to wishlist

Product added to compare.