JFET Transistors

JFET transistors, or junction field-effect transistors, are one of the two major transistors which control current flow based on voltage. Unlike bipolar transistors, they do not need a biasing current. They have three terminals, Source (S), Gate (G) and Drain (D). The transistor gate is created by a reverse-biased junction, allowing or disallowing current to flow between two terminals. JFETs are voltage controlled and they are the simplest form of the field-effect transistor.


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 an amplifier.


What are the different types of JFETS?


The semiconductor channel within JFET transistors (where the current flow occurs) are either N-channel (negative) or P-channel (positive) configurations. With the N-channel, if the voltage applied to the gate is less than applied at the source, the current will be reduced. Whereas in the P-channel if the voltage is greater, the current will be reduced. N-Channel JFETs have greater conductivity than P-channel JFETs so is a more efficient conductor in comparison.


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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. 671-1141
Mfr. Part No.MMBFJ177
TWD11
Each (In a Pack of 5)
units
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 Stock No. 166-2669
Mfr. Part No.MMBFJ177
TWD4
Each (On a Reel of 3000)
units
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 Stock No. 103-8037
Mfr. Part No.BF862,215
BrandNXP
TWD9
Each (On a Reel of 3000)
units
N 10 → 25mA 20 V - 20V Single Single - Surface Mount SOT-23 (TO-236AB) 3 - - 3 x 1.4 x 1mm
RS Stock No. 626-2434
Mfr. Part No.BF862,215
BrandNXP
TWD15
Each (In a Pack of 10)
units
N 10 → 25mA 20 V - 20V Single Single - Surface Mount SOT-23 (TO-236AB) 3 - - 3 x 1.4 x 1mm
RS Stock No. 806-1719
Mfr. Part No.BF256B
TWD9
Each (In a Pack of 50)
units
N 6 → 13mA - -30 V 30V Single Single - Through Hole TO-92 3 - - 4.58 x 3.86 x 4.58mm
RS Stock No. 124-1384
Mfr. Part No.BF256B
TWD3
Each (In a Bag of 1000)
units
N 6 → 13mA - -30 V 30V Single Single - Through Hole TO-92 3 - - 4.58 x 3.86 x 4.58mm
RS Stock No. 760-3123
Mfr. Part No.2SK208-R(TE85L,F)
BrandToshiba
TWD12
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. 806-1747
Mfr. Part No.J105
TWD20
Each (In a Pack of 10)
units
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 Stock No. 166-1840
Mfr. Part No.MMBFJ201
TWD4
Each (On a Reel of 3000)
units
N 0.3 → 1.5mA - -40 V 40V Single Single - Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
RS Stock No. 166-0242
Mfr. Part No.PMBFJ174,215
BrandNXP
TWD10
Each (On a Reel of 3000)
units
P 20 → 135mA 30 V +30 V 30V Single Single 85 Ω Surface Mount SOT-23 3 - - 3 x 1.4 x 1mm
RS Stock No. 761-3688
Mfr. Part No.MMBFJ201
TWD7
Each (In a Pack of 25)
units
N 0.3 → 1.5mA - -40 V 40V Single Single - Surface Mount SOT-23 3 - - 2.92 x 1.3 x 0.93mm
RS Stock No. 626-3263
Mfr. Part No.PMBFJ174,215
BrandNXP
TWD13
Each (In a Pack of 5)
units
P 20 → 135mA 30 V +30 V 30V Single Single 85 Ω Surface Mount SOT-23 3 - - 3 x 1.4 x 1mm
RS Stock No. 626-3229
Mfr. Part No.PMBF4391,215
BrandNXP
TWD10
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. 166-2961
Mfr. Part No.J105
TWD9
Each (In a Bag of 10000)
units
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 Stock No. 166-0547
Mfr. Part No.PMBF4391,215
BrandNXP
TWD6
Each (On a Reel of 3000)
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. 112-4185
Mfr. Part No.PMBF4393,215
BrandNXP
TWD10
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. 163-2025
Mfr. Part No.2SK932-24-TB-E
TWD6
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. 163-2023
Mfr. Part No.2SK932-22-TB-E
TWD5
Each (On a Reel of 3000)
units
N 7.3 → 12mA 15 V - -15V Single Single - Surface Mount CP 3 10pF 3pF 2.9 x 1.5 x 1.1mm
RS Stock No. 792-5167
Mfr. Part No.2SK3557-7-TB-E
TWD8
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
RS Stock No. 163-2020
Mfr. Part No.2SK3557-6-TB-E
TWD4
Each (On a Reel of 3000)
units
N 10 → 20mA 15 V - -15V Single Single - Surface Mount CP 3 10pF 2.9pF 2.9 x 1.5 x 1.1mm