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What is a JFET?

A JFET, or junction gate field-effect transistor, is a type of field-effect transistor. A JFET can be used as a voltage-controlled resistance or as an electronically-controlled switch. A p-type JFET consists of a channel of semiconductor material containing a large amount of positive charge carriers or holes, whereas an n-type JFET consists of a channel of semiconductor material containing a large amount of negative charge carriers or holes. At each end of the JFET, ohmic contacts form the source and drain. Electric charge flows through the channel between the source and drain. Electric current can be impeded or switched off by applying a reverse bias voltage to a gate.

Types of JFETs

There are several different kinds of JFETs. At Future Electronics we stock many of the most common types categorized by Channel Type, Maximum Gate-Source Voltage, Minimum Drain Current, Drain-to-Source Voltage and Packaging Type. The parametric filters on our website can help refine your search results depending on the required specifications.

The most common sizes for Drain-to-Source Voltage are 25 V and 30 V. We also carry JFETs with Drain-to-Source Voltage up to 40 V. Channel Type can be Dual N-Channel, N-Channel or P-Channel.

JFETs from Future Electronics

Future Electronics has a complete selection of semiconductor junction gate field effect transistors from several manufacturers that can be used as a JFET amplifier or for any types of applications that may require a JFET transistor circuit. Simply choose from the JFET technical attributes below and your search results will quickly be narrowed in order to match your specific JFET application needs.

If you have a preferred brand, we deal with Calogic, Fairchild, NXP, ON Semiconductor or Vishay, among other manufacturers. You can easily refine your JFET product search results by clicking your preferred JFET brand below from our list of manufacturers.

Applications for JFETs:

JFETs can be used for several applications including:

  • • High Input Impedance Amplifier
  • • Low-Noise Amplifier
  • • Differential Amplifier
  • • Constant Current Source
  • • Analog Switch or Gate
  • • Voltage Controlled Resistor

Choosing the Right JFET:

When you are looking for the right JFETs, you can filter the results by various attributes with the FutureElectronics.com parametric search: by Drain-to-Source Voltage (-30 V, 25 V, 30 V,…), Channel Type (Dual N-Channel, N-Channel or P-Channel) or Minimum Drain Current (from -50 mA to 75 A), to name a few. You will be able to find the right semiconductor junction gate field effect transistors such as a JFET amplifier or for any application types requiring a JFET transistor circuit.

JFETs in Production Ready Packaging or R&D Quantities

We offer customers many of our products in quantities that will help you avoid unneeded surplus.

In addition, Future Electronics offers its clients a unique bonded inventory program designed to eliminate potential problems that could arise from an unpredictable supply of products containing raw metals and products with long or erratic lead times. Talk with your nearest Future Electronics branch so you can find out more on how you can avoid possible shortages.





Manufacturer Part Number Description
CalogicSST202SST202 Series N-Channel 40 V 50 mA JFET General Purpose Amplifier - SOT-23
CalogicSST177-LFSST177 Series 30 V 50 mA 350 mW P-Channel JFET Switch - SOT-23-3
CalogicSST201SST201 Series N-Channel JFET general purpose amplifier-3-Pin SOT-23
Calogic2N43932N4393 Series N-Channel -40 V 0.2 uA JFET Switch Through Hole - TO-18
CalogicSST404-LFSST404 Series 50 V 10 mA N-Channel JFET Monolithic Dual - SOIC-8
CalogicU401U401 Series 50 V 10 mA Dual N-Channel JFET Switch - TO-71
Calogic2N4119A2N4119 Series 20 Vgs 50 mA N-Channel JFET General Purpose Amplifier - TO-72
FairchildMMBFJ113MMBFJ113 Series 35 V 2 mA Surface Mount N-Channel Switch - SOT-23
FairchildMMBF4392MMBF4392 Series 30 V 75 mA Surface Mount N-Channel Switch - SOT-23
FairchildMMBFJ201MMBFJ201 Series 40 V 1 mA N-Channel General Purpose Amplifier - SOT-23
FairchildMMBF5460MMBF5460 Series 40 V 1 mA P-Channel General Purpose Amplifier - SOT-23-3
FairchildMMBFJ111MMBF Series N-Channel 35 V 20 mA SMT Low Noise Amplifier Switch - SOT-23-3
FairchildJ111J111 Series 35 V 20 mA Through Hole N-Channel Switch - TO-92
FairchildJ106J106 Series 25 V 10 mA 6 Ohm N Channel JFET Switch - TO-92
FairchildJ112J112 Series 35 V 5 mA Through Hole N-Channel Switch - TO-92
FairchildJ305J305 Series 30 V 10 mA N-Channel RF Amplifier - TO-92
FairchildMMBFJ108MMBFJ108 Series 25 V 80 mA Surface Mount N-Channel Switch - SuperSot-3
NXPPMBFJ177,215PMBFJ174 Series 30 V 20 mA P-Ch silicon Field-effect Transistor - SOT-23-3
NXPBSR58,215BSR58 Series 40 V 250 mW SMT N-Channel FETs - SOT-23-3
NXPPMBF4392,215PMBF4392 Series Symmetrical Silicon N-Channel Field-Effect Transistor - SOT-23-3
ON SemiconductorMMBF4391LT1GMMBF4391LT1G Series N Channel 30 V 50 mA JFET Switching Transistor - SOT-23
ON SemiconductorMMBF4393LT1GMMBF4393LT1G Series N Channel 30 V 50 mA JFET Switching Transistor - SOT-23
ON SemiconductorMMBF4392LT1GMMBF4392LT1G Series N Channel 30 V 50 mA JFET Switching Transistor - SOT-23
VishayU310-E3U308 Series -25 V 60 mA 500 mW Through Hole N-Channel JFETs
Vishay2N4392-E32N4392 Series -55 V 150 mA Through Hole N-Channel JFETs - TO-206AA(TO-18)

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