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. 806-1750
Mfr. Part No.J109
Brandonsemi
kr 3,631
Each (In a Pack of 25)
Units
N min. 40mA - -25 V 25V Single Single 12 Ω Through Hole TO-92 3 85pF 85pF 4.58 x 3.86 x 4.58mm
RS Stock No. 166-2021
Mfr. Part No.J109
Brandonsemi
kr 1,728
Each (In a Bag of 1000)
Units
N min. 40mA - -25 V 25V Single Single 12 Ω Through Hole TO-92 3 85pF 85pF 4.58 x 3.86 x 4.58mm
RS Stock No. 124-1385
Mfr. Part No.J112
Brandonsemi
kr 1,143
Each (In a Bag of 1000)
Units
N min. 5mA - -35 V 35V Single Single 50 Ω Through Hole TO-92 3 28pF 28pF 5.2 x 4.19 x 5.33mm
RS Stock No. 806-1753
Mfr. Part No.J111
Brandonsemi
kr 3,133
Each (In a Pack of 50)
Units
N min. 20mA - -35 V 35V Single Single 30 Ω Through Hole TO-92 3 28pF 28pF 5.2 x 4.19 x 5.33mm
RS Stock No. 166-2910
Mfr. Part No.J111
Brandonsemi
kr 0,845
Each (In a Bag of 10000)
Units
N min. 20mA - -35 V 35V Single Single 30 Ω Through Hole TO-92 3 28pF 28pF 5.2 x 4.19 x 5.33mm
RS Stock No. 806-1757
Mfr. Part No.J112
Brandonsemi
kr 3,033
Each (In a Pack of 50)
Units
N min. 5mA - -35 V 35V Single Single 50 Ω Through Hole TO-92 3 28pF 28pF 5.2 x 4.19 x 5.33mm
RS Stock No. 166-2224
Mfr. Part No.MMBFJ270
Brandonsemi
kr 1,405
Each (On a Reel of 3000)
Units
P -2 to -15mA 15 V +30 V -30V Single Single - Surface Mount SOT-23 3 - - 2.9 x 1.3 x 1.04mm
RS Stock No. 792-5167
Mfr. Part No.2SK3557-7-TB-E
Brandonsemi
kr 3,914
Each (In a Pack of 20)
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. 145-5553
Mfr. Part No.MMBFJ112
Brandonsemi
kr 1,007
Each (On a Reel of 3000)
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. 169-7868
Mfr. Part No.DSK5J01R0L
BrandPanasonic
kr 0,47
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. 163-2019
Mfr. Part No.2SK2394-7-TB-E
Brandonsemi
kr 2,237
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. 163-0963
Mfr. Part No.MMBFJ177LT1G
Brandonsemi
kr 1,405
Each (On a Reel of 3000)
Units
P 1.5 to 20mA - - 25V dc Single Single 300 Ω Surface Mount SOT-23 3 - 11pF 3.04 x 1.4 x 1.01mm
RS Stock No. 749-8268
Mfr. Part No.DSK5J01R0L
BrandPanasonic
kr 0,484
Each (In a Pack of 20)
Units
N 5 to 12mA - - -55V Single Single - Surface Mount SMini3 F2 B 3 - - 2 x 1.25 x 0.8mm
RS Stock No. 806-4251
Mfr. Part No.MMBF4093
Brandonsemi
kr 3,283
Each (In a Pack of 50)
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
RS Stock No. 626-2311
Mfr. Part No.BF513,215
BrandNXP
kr 6,044
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. 792-5155
Mfr. Part No.2SK2394-7-TB-E
Brandonsemi
kr 5,423
Each (In a Pack of 25)
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. 145-5347
Mfr. Part No.J113
Brandonsemi
kr 1,094
Each (In a Bag of 1000)
Units
N min. 2mA - -35 V 35V Single Single 100 Ω Through Hole TO-92 3 28pF 28pF 5.2 x 4.19 x 5.33mm
RS Stock No. 867-3287
Mfr. Part No.TF412ST5G
Brandonsemi
kr 3,381
Each (In a Pack of 50)
Units
N 1.2 to 3mA 30 V - -30V Single Single - Surface Mount SOT-883 3 4pF 4pF 1.08 x 0.68 x 0.41mm
RS Stock No. 760-3126
Mfr. Part No.2SK209-Y(TE85L,F)
BrandToshiba
kr 3,577
Each (In a Pack of 10)
Units
N 1.2 to 3.0mA 10 V -30 V -50V Single Single - Surface Mount SOT-346 (SC-59) 3 - - 2.9 x 1.5 x 1.1mm
RS Stock No. 792-5170
Mfr. Part No.2SK932-22-TB-E
Brandonsemi
kr 4,605
Each (In a Pack of 25)
Units
N 7.3 to 12mA 15 V - -15V Single Single - Surface Mount CP 3 10pF 3pF 2.9 x 1.5 x 1.1mm