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. 112-5510
Mfr. Part No.PMBFJ177,215
BrandNXP
PHP28.298
Each (In a Pack of 5)
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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. 760-3123
Mfr. Part No.2SK208-R(TE85L,F)
BrandToshiba
PHP23.459
Each (In a Pack of 10)
units
N 0.3 to 0.75mA 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. 103-8162
Mfr. Part No.PMBFJ177,215
BrandNXP
PHP8.957
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. 806-1766
Mfr. Part No.J113
Brandonsemi
PHP21.133
Each (In a Pack of 50)
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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. 145-5347
Mfr. Part No.J113
Brandonsemi
PHP7.061
Each (In a Bag of 1000)
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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. 756-0350
Mfr. Part No.2SK3320-BL(TE85L,F
BrandToshiba
PHP40.646
Each (In a Pack of 5)
units
N 6 to 14mA 50 V -1.5 V -50V Dual Common Source - Surface Mount USV 5 13pF - 2 x 1.25 x 0.9mm
RS Stock No. 124-1385
Mfr. Part No.J112
Brandonsemi
PHP7.097
Each (In a Bag of 1000)
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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. 806-1757
Mfr. Part No.J112
Brandonsemi
PHP19.191
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. 626-2311
Mfr. Part No.BF513,215
BrandNXP
PHP33.02
Each (In a Pack of 10)
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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. 166-0536
Mfr. Part No.BF513,215
BrandNXP
PHP21.291
Each (On a Reel of 3000)
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. 166-3077
Mfr. Part No.MMBF4093
Brandonsemi
PHP5.502
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
RS Stock No. 773-7813
Mfr. Part No.MMBFJ310LT3G
Brandonsemi
PHP22.176
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. 625-5723
Mfr. Part No.MMBF4391LT1G
Brandonsemi
PHP20.658
Each (In a Pack of 5)
units
N 50 to 150mA 30 V +30 V 30V Single Single 30 Ω Surface Mount SOT-23 3 - - 2.9 x 1.3 x 0.94mm
RS Stock No. 761-3688
Mfr. Part No.MMBFJ201
Brandonsemi
PHP16.926
Each (In a Pack of 25)
units
N 0.3 to 1.5mA - -40 V 40V Single Single - Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
RS Stock No. 163-0964
Mfr. Part No.MMBFJ309LT1G
Brandonsemi
PHP7.665
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. 806-4251
Mfr. Part No.MMBF4093
Brandonsemi
PHP17.798
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. 625-5745
Mfr. Part No.MMBFJ310LT1G
Brandonsemi
PHP30.694
Each (In a Pack of 5)
units
N 24 to 60mA 25 V +25 V - Single Single - Surface Mount SOT-23 3 - - 2.9 x 1.3 x 0.94mm
RS Stock No. 122-0136
Mfr. Part No.MMBFJ310LT3G
Brandonsemi
PHP6.685
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. 163-2337
Mfr. Part No.MMBF4391LT1G
Brandonsemi
PHP6.017
Each (On a Reel of 3000)
units
N 50 to 150mA 30 V +30 V 30V Single Single 30 Ω Surface Mount SOT-23 3 - - 2.9 x 1.3 x 0.94mm
RS Stock No. 170-3357
Mfr. Part No.MMBFJ310LT1G
Brandonsemi
PHP7.665
Each (On a Reel of 3000)
units
N 24 to 60mA 25 V +25 V - Single Single - Surface Mount SOT-23 3 - - 2.9 x 1.3 x 0.94mm