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. 806-4302
Mfr. Part No.MMBFJ110
MYR1.311
Each (In a Pack of 25)
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. 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. 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. 671-1141
Mfr. Part No.MMBFJ177
MYR1.596
Each (In a Pack of 5)
units
P 1.5 → 20mA - +30 V -30V Single Single 300 Ω Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
RS Stock No. 626-2412
Mfr. Part No.BF861C,215
BrandNXP
MYR3.458
Each (In a Pack of 10)
units
N 12 to 25mA 25 V +25 V 25V Single Single - Surface Mount SOT-23 (TO-236AB) 3 - - 3 x 1.4 x 1mm
RS Stock No. 163-0963
Mfr. Part No.MMBFJ177LT1G
MYR0.516
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. 124-2284
Mfr. Part No.BF861C,215
BrandNXP
MYR1.43
Each (On a Reel of 3000)
units
N 12 to 25mA 25 V -25 V, +25 V 25V Single Single - Surface Mount SOT-23 (TO-236AB) 3 - - 3 x 1.4 x 1mm
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. 166-2224
Mfr. Part No.MMBFJ270
MYR0.552
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. 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. 163-2024
Mfr. Part No.2SK932-23-TB-E
MYR0.548
Each (On a Reel of 3000)
units
N 10 to 17mA 15 V - -15V Single Single - Surface Mount CP 3 10pF 3pF 2.9 x 1.5 x 1.1mm
RS Stock No. 806-1753
Mfr. Part No.J111
MYR0.945
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. 2508956507
Mfr. Part No.NTE451
MYR7.00
Each
units
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