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. 772-8929
Mfr. Part No.MMBF5485
HK$0.782
Each (On a Tape of 100)
units
N 4 → 10mA - - - Single Single - Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
RS Stock No. 112-4185
Mfr. Part No.PMBF4393,215
BrandNXP
HK$3.10
Each
units
N 50 → 150mA 40 V -40 V 40V Single Single 100 Ω Surface Mount SOT-23 3 - - 3 x 1.4 x 1mm
RS Stock No. 145-4270
Mfr. Part No.MMBF4393LT1G
HK$0.71
Each (On a Reel of 3000)
units
N 5 → 30mA 30 V +30 V 30V Single Single 100 Ω Surface Mount SOT-23 3 14 pF @ 0 V 14 pF @ -15 V 3.04 x 1.4 x 1.01mm
RS Stock No. 166-1840
Mfr. Part No.MMBFJ201
HK$0.833
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. 103-5701
Mfr. Part No.BFR31,215
BrandNXP
HK$1.521
Each (On a Reel of 3000)
units
N 1 → 5mA 25 V -25 V -25V Single Single - Surface Mount SOT-23 (TO-236AB) 3 - - 3 x 1.4 x 1mm
RS Stock No. 166-3089
Mfr. Part No.MMBF5461
HK$0.683
Each (On a Reel of 3000)
units
P -2 → -9mA 15 V +40 V -40V Single Single - Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
RS Stock No. 806-4298
Mfr. Part No.MMBF5460
HK$1.963
Each (In a Pack of 50)
units
P -1 → -5mA 15 V +40 V -40V Single Single - Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
RS Stock No. 626-2282
Mfr. Part No.BF510,215
BrandNXP
HK$4.514
Each (In a Pack of 10)
units
N 0.7 → 3.0mA 20 V - 20V Single Single - Surface Mount SOT-23 (TO-236AB) 3 - - 3 x 1.4 x 1mm
RS Stock No. 663-9058
Mfr. Part No.2SK3557-6-TB-E
BrandSanyo
HK$3.13
Each (In a Pack of 5)
units
N - 15 V - -15V Single - - Surface Mount CP 3 2.9pF 10pF 2.9 x 1.5 x 1.1mm
RS Stock No. 146-2080
Mfr. Part No.MMBF5459
HK$0.485
Each (On a Reel of 3000)
units
N 4 → 16mA - -25 V 25V Single Single - Surface Mount SOT-23 3 3pF 7pF 2.92 x 1.3 x 0.93mm
RS Stock No. 806-4314
Mfr. Part No.MMBFJ176
HK$2.565
Each (On a Tape of 50)
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
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. 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. 166-3088
Mfr. Part No.MMBF5458
HK$0.552
Each (On a Reel of 3000)
units
N 2 → 9mA 15 V -25 V 25V Single Single - Surface Mount SOT-23 3 - - 2.9 x 1.3 x 1.04mm
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. 806-4318
Mfr. Part No.MMBFJ270
HK$2.887
Each (In a Pack of 50)
units
P -2 → -15mA 15 V +30 V -30V Single Single - Surface Mount SOT-23 3 - - 2.9 x 1.3 x 1.04mm
RS Stock No. 864-7846
Mfr. Part No.MMBF4393LT1G
HK$2.372
Each (In a Pack of 50)
units
N 5 → 30mA 30 V +30 V 30V Single Single 100 Ω Surface Mount SOT-23 3 14 pF @ 0 V 14 pF @ -15 V 3.04 x 1.4 x 1.01mm
RS Stock No. 806-4291
Mfr. Part No.MMBF5461
HK$1.805
Each (In a Pack of 50)
units
P -2 → -9mA 15 V +40 V -40V Single Single - Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
RS Stock No. 169-7870
Mfr. Part No.DSK9J01Q0L
BrandPanasonic
HK$1.516
Each (On a Reel of 3000)
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. 103-7584
Mfr. Part No.BF545A,215
BrandNXP
HK$2.494
Each (On a Reel of 3000)
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
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