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. 166-3079
Mfr. Part No.MMBF4091
HK$0.642
Each (On a Reel of 3000)
units
N Min. 30mA 0.2 V -40 V 40V Single Single 30 Ω Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
RS Stock No. 773-7813
Mfr. Part No.MMBFJ310LT3G
HK$2.43
Each (In a Pack of 10)
units
N 24 → 60mA 25 V - - Single Single - Surface Mount SOT-23 3 - 5pF 3.04 x 1.4 x 1.01mm
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. 806-1753
Mfr. Part No.J111
HK$1.495
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. 545-213
Mfr. Part No.2SK3666-3-TB-E
BrandSanyo
HK$0.81
Each (In a Pack of 25)
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. 166-3095
Mfr. Part No.MMBFJ310
HK$0.986
Each (On a Reel of 3000)
units
N 24 → 60mA 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. 166-2319
Mfr. Part No.BSR58
HK$0.574
Each (On a Reel of 3000)
units
N 8 → 80mA 0.4 V -40 V 40V Single Single - Surface Mount SOT-23 3 - - 2.9 x 1.3 x 0.97mm
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. 867-3287
Mfr. Part No.TF412ST5G
HK$1.201
Each (In a Pack of 50)
units
N 1.2 → 3mA 30 V - -30V Single Single - Surface Mount SOT-883 3 4pF 4pF 1.08 x 0.68 x 0.41mm
RS Stock No. 626-3229
Mfr. Part No.PMBF4391,215
BrandNXP
HK$1.764
Each (In a Pack of 10)
units
N 50 → 150mA 40 V -40 V 40V Single Single 30 Ω Surface Mount SOT-23 3 - - 3 x 1.4 x 1mm
RS Stock No. 806-4267
Mfr. Part No.MMBF4391
HK$1.352
Each (In a Pack of 50)
units
N 50 → 150mA 0.4 V -30 V 30V Single Single 30 Ω Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
RS Stock No. 806-4279
Mfr. Part No.MMBF4416
HK$0.87
Each (On a Tape of 100)
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. 166-2223
Mfr. Part No.MMBFJ110
HK$1.185
Each (On a Reel of 3000)
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. 807-5201
Mfr. Part No.BSR58
HK$0.874
Each (In a Pack of 100)
units
N 8 → 80mA 0.4 V -40 V 40V Single Single - Surface Mount SOT-23 3 - - 2.9 x 1.3 x 0.97mm
RS Stock No. 792-5278
Mfr. Part No.CPH5905G-TL-E
HK$2.77
Each (On a Tape of 20)
units
N 10 → 20mA 15 V - -15V Single Single - Surface Mount CPH 5 10pF 2.9pF 2.9 x 1.6 x 0.9mm
RS Stock No. 163-2025
Mfr. Part No.2SK932-24-TB-E
HK$1.436
Each (On a Reel of 3000)
units
N 14.5 → 24mA 15 V - -15V Single Single - Surface Mount CP 3 10pF 3pF 2.9 x 1.5 x 1.1mm
RS Stock No. 626-2412
Mfr. Part No.BF861C,215
BrandNXP
HK$4.213
Each (In a Pack of 10)
units
N 12 → 25mA 25 V +25 V 25V Single Single - Surface Mount SOT-23 (TO-236AB) 3 - - 3 x 1.4 x 1mm
RS Stock No. 920-9928
Mfr. Part No.TF414T5G
HK$1.194
Each (In a Pack of 50)
units
N 0.05 → 0.13mA 40 V - -40V Single Single - Surface Mount SOT-883 3 0.7pF 0.3pF 1.07 x 0.67 x 0.41mm
RS Stock No. 162-9314
Mfr. Part No.CPH6904-TL-E
HK$2.268
Each (On a Reel of 3000)
units
N 20 → 40mA 25 V - -25V Dual Common Source - Surface Mount CPH 6 6pF 2.3pF 2.9 x 1.6 x 0.9mm
RS Stock No. 166-3094
Mfr. Part No.MMBFJ176
HK$1.039
Each (On a Reel of 3000)
units
P -2 → -25mA 15 V +30 V -30V Single Single 250 Ω Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
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