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. 169-7869
Mfr. Part No.DSK9J01P0L
BrandPanasonic
HK$1.516
Each (On a Reel of 3000)
units
N 1 → 3mA - - -55V Single Single - Surface Mount SSMini3 F3 B 3 - - 1.6 x 0.85 x 0.7mm
RS Stock No. 806-1750
Mfr. Part No.J109
HK$1.992
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. 792-5161
Mfr. Part No.2SK3666-3-TB-E
HK$2.466
Each (In a Pack of 50)
units
N 1.2 → 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. 163-0037
Mfr. Part No.MMBFJ175LT1G
HK$1.491
Each (On a Reel of 3000)
units
P -7 → -60mA 15 V - -25V Single Single 125 Ω Surface Mount SOT-23 3 11 pF @ 0 V 11 pF @ -10 V 3.04 x 1.4 x 1.01mm
RS Stock No. 163-2024
Mfr. Part No.2SK932-23-TB-E
HK$1.175
Each (On a Reel of 3000)
units
N 10 → 17mA 15 V - -15V Single Single - Surface Mount CP 3 10pF 3pF 2.9 x 1.5 x 1.1mm
RS Stock No. 792-5173
Mfr. Part No.2SK932-23-TB-E
HK$2.403
Each (On a Tape of 25)
units
N 10 → 17mA 15 V - -15V Single Single - Surface Mount CP 3 10pF 3pF 2.9 x 1.5 x 1.1mm
RS Stock No. 749-8277
Mfr. Part No.DSK9J01Q0L
BrandPanasonic
HK$2.778
Each (In a Pack of 20)
units
N 2 → 6.5mA - - -55V Single Single - Surface Mount SSMini3 F3 B 3 - - 1.6 x 0.85 x 0.7mm
RS Stock No. 163-0964
Mfr. Part No.MMBFJ309LT1G
HK$1.491
Each (On a Reel of 3000)
units
N 12 → 30mA 25 V - - Single Single - Surface Mount SOT-23 3 - 5pF 3.04 x 1.4 x 1.01mm
RS Stock No. 146-2128
Mfr. Part No.MMBF4416
HK$0.495
Each (On a Reel of 3000)
units
N 5 → 15mA 15 V -30 V 30V Single Single - Surface Mount SOT-23 3 - - 2.9 x 1.3 x 1.04mm
RS Stock No. 749-8265
Mfr. Part No.DSK5J01P0L
BrandPanasonic
HK$2.318
Each (In a Pack of 20)
units
N 1 → 3mA - - -55V Single Single - Surface Mount SMini3 F2 B 3 - - 2 x 1.25 x 0.8mm
RS Stock No. 166-2717
Mfr. Part No.MMBF4117
HK$0.775
Each (On a Reel of 3000)
units
N 0.03 → 0.09mA - -40 V 40V Single Single - Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
RS Stock No. 806-4282
Mfr. Part No.MMBF5103
HK$1.433
Each (In a Pack of 50)
units
N 10 → 40mA 20 V -40 V 40V Single Single - Surface Mount SOT-23 3 - - 2.9 x 1.3 x 1.04mm
RS Stock No. 166-2241
Mfr. Part No.MMBF5484
HK$0.522
Each (On a Reel of 3000)
units
N 1 → 5mA 15 V -25 V 25V Single Single - Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
RS Stock No. 806-1741
Mfr. Part No.J107
HK$4.276
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. 163-2019
Mfr. Part No.2SK2394-7-TB-E
HK$1.667
Each (On a Reel of 3000)
units
N 16 → 32mA 15 V - -15V Single Single - Surface Mount CP 3 10pF 2.9pF 2.9 x 1.5 x 1.1mm
RS Stock No. 166-3085
Mfr. Part No.MMBF5103
HK$0.672
Each (On a Reel of 3000)
units
N 10 → 40mA 20 V -40 V 40V Single Single - Surface Mount SOT-23 3 - - 2.9 x 1.3 x 1.04mm
RS Stock No. 663-9077
Mfr. Part No.CPH5905H-TL-E
BrandSanyo
HK$3.13
Each (In a Pack of 5)
units
N - 15 V - -15V Dual Emitter Drain - - Surface Mount CPH 5 2.9pF 10pF 2.9 x 1.6 x 0.9mm
RS Stock No. 663-9051
Mfr. Part No.2SK3666-2-TB-E
BrandSanyo
HK$1.01
Each (In a Pack of 10)
units
N - 30 V - -30V Single - 200 Ω Surface Mount CP 3 1.1pF 4pF 2.9 x 1.5 x 1.1mm
RS Stock No. 146-2129
Mfr. Part No.MMBFJ309
HK$0.936
Each (On a Reel of 3000)
units
N 12 → 30mA 10 V -25 V - Single Single - Surface Mount SOT-23 3 2.5pF 5pF 2.92 x 1.3 x 0.93mm
RS Stock No. 626-3308
Mfr. Part No.PMBFJ308,215
BrandNXP
HK$1.72
Each (In a Pack of 10)
units
N 12 → 60mA 25 V -25 V -25V Single Single 50 Ω Surface Mount SOT-23 (TO-236AB) 3 - - 3 x 1.4 x 1mm
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