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. 166-2696
Mfr. Part No.MMBF5457
HK$0.819
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. 166-2993
Mfr. Part No.MMBF5485
HK$0.538
Each (On a Reel of 3000)
units
N 4 → 10mA - - - Single Single - Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
RS Stock No. 749-8268
Mfr. Part No.DSK5J01R0L
BrandPanasonic
HK$1.517
Each (In a Pack of 20)
units
N 5 → 12mA - - -55V Single Single - Surface Mount SMini3 F2 B 3 - - 2 x 1.25 x 0.8mm
RS Stock No. 807-5207
Mfr. Part No.BSR57
HK$1.61
Each (On a Tape of 50)
units
N 20 → 100mA 0.5 V -40 V 40V Single Single - Surface Mount SOT-23 3 - - 2.9 x 1.3 x 0.97mm
RS Stock No. 626-3241
Mfr. Part No.PMBFJ110,215
BrandNXP
HK$3.44
Each (In a Pack of 5)
units
N Min. 10mA 25 V -25 V -25V Single Single 18 Ω Surface Mount SOT-23 (TO-236AB) 3 - - 3 x 1.4 x 1mm
RS Stock No. 760-3123
Mfr. Part No.2SK208-R(TE85L,F)
BrandToshiba
HK$2.635
Each (In a Pack of 10)
units
N 0.3 → 0.75mA 10 V -30 V -50V Single Single - Surface Mount SOT-346 (SC-59) 3 - - 2.9 x 1.5 x 1.1mm
RS Stock No. 806-4254
Mfr. Part No.MMBF4091
HK$1.489
Each (In a Pack of 50)
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. 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. 806-1766
Mfr. Part No.J113
HK$1.89
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. 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. 166-2224
Mfr. Part No.MMBFJ270
HK$1.131
Each (On a Reel of 3000)
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. 760-6030
Mfr. Part No.MMBF5457
HK$1.708
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. 166-2241
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. 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. 806-1741
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. 166-3077
Mfr. Part No.MMBF4093
HK$0.642
Each (On a Reel of 3000)
units
N Min. 8mA 0.2 V -40 V 40V Single Single 80 Ω Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
RS Stock No. 806-4260
Mfr. Part No.MMBF4118
HK$1.724
Each (In a Pack of 50)
units
N 0.08 → 0.24mA 10 V -40 V 40V Single Single - Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
RS Stock No. 166-0535
Mfr. Part No.BF510,215
BrandNXP
HK$2.325
Each (On a Reel of 3000)
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. 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. 792-5167
Mfr. Part No.2SK3557-7-TB-E
HK$2.573
Each (In a Pack of 20)
units
N 16 → 32mA 15 V - -15V Single Single - Surface Mount CP 3 10pF 2.9pF 2.9 x 1.5 x 1.1mm
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