JFETs

A JFET is a four-terminal device, the terminals are called the gate, drain, source and body. The body terminal is always connected to the source. There are two types of JFETs and N-Channel P-Channel. FET stands for junction field-effect transistor. They can also be referred to as a JUGFET

N-Channel JFET Construction

The name N-Channel signifies that the electrons are the majority charge carriers. To form the N-Channel an N type semiconductor is used as a base and doped with a P type semiconductor at both ends. Both these P regions are electrically linked together with an ohmic contact at the gate. Two further terminals are taken out at the opposite ends for the drain and the source.

P-Channel JFET Construction

The name P channel signifies that the holes are the majority charge carriers. To form the P-Channel a P type semiconductor is used as a base and doped with an N type semiconductor at both ends. Both these N regions are electrically linked together with an ohmic contact at the gate. Two further terminals are taken out at the opposite ends for the drain and the source.

Features and Benefits

  • High input impedance
  • Voltage-controlled device
  • A high degree of isolation between the input and the output
  • Less noise

What are JFET transistors used for?

JFET transistors have many applications in electronics and communication. You can use them as an electronically controlled switch to control electric power to a load, and as amplifiers.

What is the difference between a JFET and BJT (Bipolar Junction Transistor)?

The main difference between a JFET and BJT is a field effect transistor only majority charge carrier flows while the BJT (bipolar transistor) offers both majority and minority charge carriers flow.

What is the doping of semiconductors?

Doping is the process of including foreign impurities to intrinsic semiconductors to change their electrical properties. Trivalent atoms used to dope silicon cause an intrinsic semiconductor to become a P-Type semiconductor. Pentavalent used to dope silicon cause an intrinsic semiconductor to become an N-Type semiconductor.


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Description Price Channel Type Idss Drain-Source Cut-off Current Maximum Drain Source Voltage Maximum Gate Source Voltage Maximum Drain Gate Voltage Configuration Transistor Configuration Maximum Drain Source Resistance Mounting Type Package Type Pin Count Drain Gate On-Capacitance Source Gate On-Capacitance Dimensions
RS Stock No. 122-0136
Mfr. Part No.MMBFJ310LT3G
MYR0.516
Each (On a Reel of 10000)
units
N 24 to 60mA 25 V - - Single Single - Surface Mount SOT-23 3 - 5pF 3.04 x 1.4 x 1.01mm
RS Stock No. 145-5192
Mfr. Part No.2SK3666-2-TB-E
MYR0.334
Each (On a Reel of 3000)
units
N 0.6 to 1.5mA 30 V - -30V Single Single 200 Ω Surface Mount SOT-23 3 - - 2.9 x 1.5 x 1.1mm
RS Stock No. 103-8162
Mfr. Part No.PMBFJ177,215
BrandNXP
MYR0.715
Each (On a Reel of 3000)
units
P 1.5 to 20mA 30 V +30 V 30V Single Single 300 Ω Surface Mount SOT-23 (TO-236AB) 3 - - 3 x 1.4 x 1mm
RS Stock No. 163-2019
Mfr. Part No.2SK2394-7-TB-E
MYR0.834
Each (On a Reel of 3000)
units
N 16 to 32mA 15 V - -15V Single Single - Surface Mount CP 3 10pF 2.9pF 2.9 x 1.5 x 1.1mm
RS Stock No. 663-9045
Mfr. Part No.2SK1740-5-TB-E
BrandSanyo
MYR1.66
Each (In a Pack of 5)
units
N - 40 V - -40V Single - 30 Ω Surface Mount CP 3 2.5pF 11pF 2.9 x 1.5 x 1.1mm
RS Stock No. 145-4162
Mfr. Part No.2SK3666-3-TB-E
MYR0.334
Each (On a Reel of 3000)
units
N 1.2 to 3mA 30 V - -30V Single Single 200 Ω Surface Mount CP 3 4pF 1.1pF 2.9 x 1.5 x 1.1mm
RS Stock No. 626-2311
Mfr. Part No.BF513,215
BrandNXP
MYR3.01
Each (In a Pack of 10)
units
N 10 to 18mA 20 V - 20V Single Single - Surface Mount SOT-23 (TO-236AB) 3 - - 3 x 1.4 x 1mm
RS Stock No. 806-4282
Mfr. Part No.MMBF5103
MYR1.15
Each (In a Pack of 50)
units
N 10 to 40mA 20 V -40 V 40V Single Single - Surface Mount SOT-23 3 - - 2.9 x 1.3 x 1.04mm
RS Stock No. 166-2223
Mfr. Part No.MMBFJ110
MYR0.553
Each (On a Reel of 3000)
units
N Min. 10mA 15 V -25 V 25V Single Single 18 Ω Surface Mount SOT-23 3 85pF 85pF 2.92 x 1.4 x 0.94mm
RS Stock No. 112-5510
Mfr. Part No.PMBFJ177,215
BrandNXP
MYR1.466
Each (In a Pack of 5)
units
P 1.5 to 20mA 30 V +30 V 30V Single Single 300 Ω Surface Mount SOT-23 3 - - 3 x 1.4 x 1mm
RS Stock No. 773-7813
Mfr. Part No.MMBFJ310LT3G
MYR1.42
Each (In a Pack of 10)
units
N 24 to 60mA 25 V - - Single Single - Surface Mount SOT-23 3 - 5pF 3.04 x 1.4 x 1.01mm
RS Stock No. 773-7819
Mfr. Part No.MMBFJ309LT1G
MYR1.17
Each (In a Pack of 10)
units
N 12 to 30mA 25 V - - Single Single - Surface Mount SOT-23 3 - 5pF 3.04 x 1.4 x 1.01mm
RS Stock No. 177-5508
Mfr. Part No.2N4392CSM
BrandSemelab
MYR292.687
Each (In a Tray of 100)
units
N 25 to 75mA 40 V +40 V 40V Single Single 60 Ω Surface Mount SOT-23 3 - - 3.05 x 2.54 x 1.02mm
RS Stock No. 163-0964
Mfr. Part No.MMBFJ309LT1G
MYR0.508
Each (On a Reel of 3000)
units
N 12 to 30mA 25 V - - Single Single - Surface Mount SOT-23 3 - 5pF 3.04 x 1.4 x 1.01mm
RS Stock No. 169-7868
Mfr. Part No.DSK5J01R0L
BrandPanasonic
MYR0.62
Each (On a Reel of 3000)
units
N 5 to 12mA - - -55V Single Single - Surface Mount SMini3 F2 B 3 - - 2 x 1.25 x 0.8mm
RS Stock No. 663-9039
Mfr. Part No.2SK1069-4-TL-E
BrandSanyo
MYR1.00
Each (In a Pack of 5)
units
N - 40 V - -40V Single - - Surface Mount MCP 3 2.1pF 9pF 2 x 1.25 x 0.9mm
RS Stock No. 626-2327
Mfr. Part No.BF545A,215
BrandNXP
MYR2.191
Each (In a Pack of 10)
units
N 2.0 → 6.5mA 30 V -30 V -30V Single Single - Surface Mount SOT-23 (TO-236AB) 3 - - 3 x 1.4 x 1mm
RS Stock No. 761-3684
Mfr. Part No.MMBFJ112
MYR1.06
Each (In a Pack of 25)
units
N min. 5mA - -35 V 35V Single Single 50 Ω Surface Mount SOT-23 3 28pF 28pF 2.92 x 1.3 x 0.93mm
RS Stock No. 166-0547
Mfr. Part No.PMBF4391,215
BrandNXP
MYR0.557
Each (On a Reel of 3000)
units
N 50 to 150mA 40 V -40 V 40V Single Single 30 Ω Surface Mount SOT-23 3 - - 3 x 1.4 x 1mm
RS Stock No. 166-3077
Mfr. Part No.MMBF4093
MYR0.342
Each (On a Reel of 3000)
units
N min. 8mA 0.2 V -40 V 40V Single Single 80 Ω Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm