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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Omschrijving Prijs 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-stocknr. 166-1840
FabrikantnummerMMBFJ201
FabrikantON Semiconductor
€ 0,086
Each (On a Reel of 3000)
Aantal stuks
N 0.3 → 1.5mA - -40 V 40V Single Single - Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
RS-stocknr. 761-3688
FabrikantnummerMMBFJ201
FabrikantON Semiconductor
€ 0,235
Each (In a Pack of 25)
Aantal stuks
N 0.3 → 1.5mA - -40 V 40V Single Single - Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
RS-stocknr. 864-7840
FabrikantnummerMMBFJ175LT1G
FabrikantON Semiconductor
€ 0,298
Each (In a Pack of 25)
Aantal stuks
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-stocknr. 806-1753
FabrikantnummerJ111
FabrikantON Semiconductor
€ 0,245
Each (In a Pack of 50)
Aantal stuks
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-stocknr. 166-2910
FabrikantnummerJ111
FabrikantON Semiconductor
€ 0,065
Each (In a Bag of 10000)
Aantal stuks
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-stocknr. 163-0037
FabrikantnummerMMBFJ175LT1G
FabrikantON Semiconductor
€ 0,108
Each (On a Reel of 3000)
Aantal stuks
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-stocknr. 162-9314
FabrikantnummerCPH6904-TL-E
FabrikantON Semiconductor
€ 0,258
Each (On a Reel of 3000)
Aantal stuks
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-stocknr. 671-1141
FabrikantnummerMMBFJ177
FabrikantON Semiconductor
€ 0,488
Each (In a Pack of 5)
Aantal stuks
P 1.5 → 20mA - +30 V -30V Single Single 300 Ω Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
RS-stocknr. 773-7819
FabrikantnummerMMBFJ309LT1G
FabrikantON Semiconductor
€ 0,298
Each (In a Pack of 10)
Aantal stuks
N 12 → 30mA 25 V - - Single Single - Surface Mount SOT-23 3 - 5pF 3.04 x 1.4 x 1.01mm
RS-stocknr. 163-0964
FabrikantnummerMMBFJ309LT1G
FabrikantON Semiconductor
€ 0,108
Each (On a Reel of 3000)
Aantal stuks
N 12 → 30mA 25 V - - Single Single - Surface Mount SOT-23 3 - 5pF 3.04 x 1.4 x 1.01mm
RS-stocknr. 791-9403
FabrikantnummerCPH6904-TL-E
FabrikantON Semiconductor
€ 0,498
Each (In a Pack of 10)
Aantal stuks
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-stocknr. 749-8274
FabrikantnummerDSK9J01P0L
FabrikantPanasonic
€ 0,35
Each (In a Pack of 20)
Aantal stuks
N 1 → 3mA - - -55V Single Single - Surface Mount SSMini3 F3 B 3 - - 1.6 x 0.85 x 0.7mm
RS-stocknr. 760-3123
Fabrikantnummer2SK208-R(TE85L,F)
FabrikantToshiba
€ 0,31
Each (In a Pack of 10)
Aantal stuks
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-stocknr. 806-1719
FabrikantnummerBF256B
FabrikantON Semiconductor
€ 0,284
Each (In a Pack of 50)
Aantal stuks
N 6 → 13mA - -30 V 30V Single Single - Through Hole TO-92 3 - - 4.58 x 3.86 x 4.58mm
RS-stocknr. 169-7869
FabrikantnummerDSK9J01P0L
FabrikantPanasonic
€ 0,14
Each (On a Reel of 3000)
Aantal stuks
N 1 → 3mA - - -55V Single Single - Surface Mount SSMini3 F3 B 3 - - 1.6 x 0.85 x 0.7mm
RS-stocknr. 806-1757
FabrikantnummerJ112
FabrikantON Semiconductor
€ 0,265
Each (In a Pack of 50)
Aantal stuks
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-stocknr. 145-5347
FabrikantnummerJ113
FabrikantON Semiconductor
€ 0,086
Each (In a Bag of 1000)
Aantal stuks
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-stocknr. 806-1747
FabrikantnummerJ105
FabrikantON Semiconductor
€ 0,615
Each (In a Pack of 10)
Aantal stuks
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-stocknr. 625-5723
FabrikantnummerMMBF4391LT1G
FabrikantON Semiconductor
€ 0,37
Each (In a Pack of 5)
Aantal stuks
N 50 → 150mA 30 V +30 V 30V Single Single 30 Ω Surface Mount SOT-23 3 - - 2.9 x 1.3 x 0.94mm
RS-stocknr. 760-3126
Fabrikantnummer2SK209-Y(TE85L,F)
FabrikantToshiba
€ 0,323
Each (In a Pack of 10)
Aantal stuks
N 1.2 → 3.0mA 10 V -30 V -50V Single Single - Surface Mount SOT-346 (SC-59) 3 - - 2.9 x 1.5 x 1.1mm
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