JFETs

JFETs
A JFET is a four terminal device, the terminals are called gate, drain, source and body. The body terminal is always connected to the source. There are two types of JFETs an N-Channel & P-Channel.
What does JFET stand for?
JFET stands for junction field-effect transistor
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
• High degree of isolation between the input and the output
• Less noise
What are they also known as?
JUGFET
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 & 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 carrier flows.
What is 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. 806-1753
Mfr. Part No.J111
$0.38
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
$0.113
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. 760-6030
Mfr. Part No.MMBF5457
$0.367
Each (In a Pack of 50)
units
N 1 → 5mA - -25 V 25V Single Single - Surface Mount SOT-23 3 3pF 7pF 2.92 x 1.3 x 0.93mm
RS Stock No. 166-2696
Mfr. Part No.MMBF5457
$0.153
Each (On a Reel of 3000)
units
N 1 → 5mA - -25 V 25V Single Single - Surface Mount SOT-23 3 3pF 7pF 2.92 x 1.3 x 0.93mm
RS Stock No. 145-5347
Mfr. Part No.J113
$0.109
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. 626-3263
Mfr. Part No.PMBFJ174,215
BrandNXP
$0.42
Each (In a Pack of 5)
units
P 20 → 135mA 30 V +30 V 30V Single Single 85 Ω Surface Mount SOT-23 3 - - 3 x 1.4 x 1mm
RS Stock No. 806-1766
Mfr. Part No.J113
$0.416
Each (In a Pack of 50)
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. 806-1741
Mfr. Part No.J107
$0.978
Each (In a Pack of 20)
units
N 100mA - -25 V 25V Single Single 8 Ω Through Hole TO-92 3 160pF 160pF 5.2 x 4.19 x 5.33mm
RS Stock No. 166-2919
Mfr. Part No.J107
$0.416
Each (In a Bag of 10000)
units
N 100mA - -25 V 25V Single Single 8 Ω Through Hole TO-92 3 160pF 160pF 5.2 x 4.19 x 5.33mm
RS Stock No. 806-1757
Mfr. Part No.J112
$0.45
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. 761-3688
Mfr. Part No.MMBFJ201
$0.399
Each (In a Pack of 25)
units
N 0.3 → 1.5mA - -40 V 40V Single Single - Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
RS Stock No. 124-1385
Mfr. Part No.J112
$0.134
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. 166-1840
Mfr. Part No.MMBFJ201
$0.141
Each (On a Reel of 3000)
units
N 0.3 → 1.5 - -40 V 40V Single Single - Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
RS Stock No. 806-1750
Mfr. Part No.J109
$0.34
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. 166-2961
Mfr. Part No.J105
$0.395
Each (In a Bag of 10000)
units
N 500mA - -25 V 25V Single Single 3 Ω Through Hole TO-92 3 160pF 160pF 5.2 x 4.19 x 5.33mm
RS Stock No. 166-2021
Mfr. Part No.J109
$0.227
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. 806-1747
Mfr. Part No.J105
$0.969
Each (In a Pack of 10)
units
N 500mA - -25 V 25V Single Single 3 Ω Through Hole TO-92 3 160pF 160pF 5.2 x 4.19 x 5.33mm
RS Stock No. 806-1719
Mfr. Part No.BF256B
$0.389
Each (In a Pack of 50)
units
N 6 → 13mA - -30 V 30V Single Single - Through Hole TO-92 3 - - 4.58 x 3.86 x 4.58mm
RS Stock No. 806-4295
Mfr. Part No.MMBF5462
$0.341
Each (On a Tape of 50)
units
P -4 → -16mA 15 V +40 V -40V Single Single - Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
RS Stock No. 166-3091
Mfr. Part No.MMBF5462
$0.119
Each (On a Reel of 3000)
units
P -4 → -16mA 15 V +40 V -40V Single Single - Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
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