MOSFETs

MOSFETs, also known as MOSFET transistors, stands for ’Metal Oxide Semiconductor Field-Effect Transistors’. MOSFETs are transistor devices which are controlled by a capacitor. The "Field-Effect" means that they are controlled by voltage. The aim of a MOSFET is to control the flow of the current passing through from the source to the drain terminals. It acts very similarly to a switch and is used for switching or amplifying electronic signals.


These semiconductor devices are ICs (integrated circuits) which are mounted onto PCBs. MOSFETs come in a range of standard package types such as DPAK, D2PAK, DFN, I2PAK, SOIC, SOT-223 and TO-220.


What are depletion and enhancement modes?


MOSFET transistors have two modes; depletion and enhancement.
Depletion MOSFETs work like a closed switch. The current passes through when no current is applied. The current flow will stop if a negative voltage is applied.
Enhancement mode MOSFETs are similar to a variable resistor and are generally more popular than the depletion mode MOSFETs. They come in n-channel or p-channel variants.


How do MOSFETs work?


The pins on a MOSFET package are the Source, Gate and Drain. When a voltage is applied between the Gate and the Source terminals, current can pass through from the Drain to the Source pins. When the voltage applied to the Gate changes, the resistance from the Drain to the Source will change too. The lower the voltage applied, the higher the resistance. As the voltage increases, the resistance from the Drain to Source will decrease.
Power MOSFETs are similar to standard MOSFETs but they are designed to handle a higher level of power.


N-Channel vs. P-Channel MOSFETs


MOSFETs are made of p-type or n-type doped silicon.


  • N-Channel MOSFETS contain additional electrons which are free to move around. They are the more popular channel type. N-Channel MOSFETs work when a positive charge is applied to the gate terminal.


  • P-Channel MOSFETS substrate contains electrons and electron holes. P-Channel MOSFETs are connected to a positive voltage. These MOSFETs turn on when the voltage supplied to the Gate terminal is lower than the Source voltage.

Where are MOSFETs used?


MOSFETs are found within many applications, such as microprocessors and other memory components. MOSFET transistors are most commonly used as a voltage-controlled switch within circuits.



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Description Price Channel Type Maximum Continuous Drain Current Maximum Drain Source Voltage Maximum Drain Source Resistance Package Type Mounting Type Pin Count Maximum Gate Source Voltage Channel Mode Maximum Gate Threshold Voltage Minimum Gate Threshold Voltage Maximum Power Dissipation Transistor Configuration Number of Elements per Chip
RS Stock No. 829-3235
Mfr. Part No.DN2540N3-G
BrandMicrochip
TWD24.40
Each (In a Pack of 10)
units
N 120 mA 400 V 25 Ω TO-92 Through Hole 3 -20 V, +20 V Depletion 3.5V - 1 W Single 1
RS Stock No. 170-4341
Mfr. Part No.DN2540N3-G
BrandMicrochip
TWD18.50
Each (In a Bag of 1000)
units
- - - - - - - - - - - - - -
RS Stock No. 170-4348
Mfr. Part No.DN3545N3-G
BrandMicrochip
TWD17.70
Each (In a Bag of 1000)
units
- - - - - - - - - - - - - -
RS Stock No. 829-3360
Mfr. Part No.DN3765K4-G
BrandMicrochip
TWD83.40
Each (In a Pack of 5)
units
N 300 mA 650 V 8 Ω DPAK (TO-252) Surface Mount 3 -20 V, +20 V Depletion 3.5V - 2.5 W Single 1
RS Stock No. 178-4924
Mfr. Part No.DN2540N5-G
BrandMicrochip
TWD38.00
Each (In a Tube of 50)
units
N 500 mA 400 V 25 Ω TO-220 Through Hole 3 -20 V, +20 V Depletion 3.5V - 15 W Single 1
RS Stock No. 829-3358
Mfr. Part No.DN3545N3-G
BrandMicrochip
TWD19.30
Each (In a Pack of 10)
units
N 130 mA 450 V 20 Ω TO-92 Through Hole 3 -20 V, +20 V Depletion 3.5V - 740 mW Single 1
RS Stock No. 829-3244
Mfr. Part No.DN2540N5-G
BrandMicrochip
TWD40.20
Each (In a Pack of 5)
units
N 500 mA 400 V 25 Ω TO-220 Through Hole 3 -20 V, +20 V Depletion 3.5V - 15 W Single 1
RS Stock No. 165-4216
Mfr. Part No.TP2104N3-G
BrandMicrochip
TWD10.50
Each (In a Bag of 1000)
units
P 175 mA 40 V 10 Ω TO-92 Through Hole 3 -20 V, +20 V Enhancement 2V - 740 mW Single 1
RS Stock No. 879-3270
Mfr. Part No.TP2104N3-G
BrandMicrochip
TWD11.80
Each (In a Pack of 25)
units
P 175 mA 40 V 10 Ω TO-92 Through Hole 3 -20 V, +20 V Enhancement 2V - 740 mW Single 1
RS Stock No. 178-5359
Mfr. Part No.DN3765K4-G
BrandMicrochip
TWD63.40
Each (On a Reel of 2000)
units
N 300 mA 650 V 8 Ω DPAK (TO-252) Surface Mount 3 -20 V, +20 V Depletion 3.5V - 2.5 W Single 1
RS Stock No. 165-4217
Mfr. Part No.VN2222LL-G
BrandMicrochip
TWD7.20
Each (In a Bag of 1000)
units
N 230 mA 60 V 7.5 Ω TO-92 Through Hole 3 -30 V, +30 V Enhancement 2.5V - 1 W Single 1
RS Stock No. 165-4218
Mfr. Part No.VP2106N3-G
BrandMicrochip
TWD8.60
Each (In a Bag of 1000)
units
P 250 mA 60 V 15 Ω TO-92 Through Hole 3 -20 V, +20 V Enhancement 3.5V - 1 W Single 1
RS Stock No. 177-9695
Mfr. Part No.TP2540N8-G
BrandMicrochip
TWD26.20
Each (On a Reel of 2000)
units
P 125 mA 400 V 30 Ω TO-243AA Surface Mount 3 20 V Enhancement 2.4V 1V 1.6 W Single 1
RS Stock No. 829-3354
Mfr. Part No.DN3535N8-G
BrandMicrochip
TWD23.00
Each (In a Pack of 10)
units
N 230 mA 350 V 10 Ω TO-243AA Surface Mount 4 -20 V, +20 V Depletion 3.5V - 1.6 W Single 1
RS Stock No. 177-9716
Mfr. Part No.VN10KN3-G
BrandMicrochip
TWD9.20
Each (In a Pack of 25)
units
N 310 mA 60 V 7.5 Ω TO-92 Through Hole 3 30 V Enhancement 2.5V 0.8V 1 W Single 1
RS Stock No. 177-9692
Mfr. Part No.TN2106N3-G
BrandMicrochip
TWD9.10
Each (In a Bag of 1000)
units
N 300 mA 60 V 5 Ω TO-92 Through Hole 3 20 V Enhancement 2V 0.6V 740 mW Single 1
RS Stock No. 165-6450
Mfr. Part No.DN3135K1-G
BrandMicrochip
TWD15.00
Each (In a Pack of 25)
units
N 72 mA 350 V 35 Ω SOT Surface Mount 3 -3.5 V Depletion - - 360 mW Single 1
RS Stock No. 178-5277
Mfr. Part No.DN3535N8-G
BrandMicrochip
TWD17.50
Each (On a Reel of 2000)
units
N 230 mA 350 V 10 Ω TO-243AA Surface Mount 4 -20 V, +20 V Depletion 3.5V - 1.6 W Single 1
RS Stock No. 177-9693
Mfr. Part No.TN2540N8-G
BrandMicrochip
TWD22.40
Each (On a Reel of 2000)
units
N 260 mA 400 V 12 Ω TO-243AA Surface Mount 3 20 V Enhancement 2V 0.6V 1.6 W Single 1
RS Stock No. 829-3253
Mfr. Part No.LND150N8-G
BrandMicrochip
TWD20.20
Each (In a Pack of 20)
units
N 30 mA 500 V 1 kΩ TO-243AA Surface Mount 4 -20 V, +20 V Depletion 3V - 1.6 W Single 1