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. 829-3244
Mfr. Part No.DN2540N5-G
BrandMicrochip
HK$11.454
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. 178-4924
Mfr. Part No.DN2540N5-G
BrandMicrochip
HK$9.45
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. 170-4342
Mfr. Part No.LND150N3-G
BrandMicrochip
HK$2.95
Each (In a Bag of 1000)
units
- - - - - - - - - - - - - -
RS Stock No. 829-3250
Mfr. Part No.LND150N3-G
BrandMicrochip
HK$3.966
Each (In a Pack of 20)
units
N 30 mA 500 V 1 kΩ TO-92 Through Hole 3 -20 V, +20 V Depletion 3V - 740 mW Single 1
RS Stock No. 861-0670
Mfr. Part No.VN2410L-G
BrandMicrochip
HK$7.56
Each (In a Pack of 10)
units
N 190 mA 240 V 10 Ω TO-92 Through Hole 3 -20 V, +20 V Enhancement 2V - 1 W Single 1
RS Stock No. 165-4217
Mfr. Part No.VN2222LL-G
BrandMicrochip
HK$2.57
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. 879-3274
Mfr. Part No.VN2222LL-G
BrandMicrochip
HK$2.82
Each (In a Pack of 25)
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. 144-5876
Mfr. Part No.VN2410L-G
BrandMicrochip
HK$5.65
Each (In a Bag of 1000)
units
- - - - TO-92 Through Hole 3 - - - - - - -
RS Stock No. 912-5259
Mfr. Part No.LND01K1-G
BrandMicrochip
HK$3.08
Each (In a Pack of 25)
units
N 330 mA 9 V 1.4 Ω SOT-23 Surface Mount 5 -12 V, +0.6 V Depletion - - 360 mW Single 1
RS Stock No. 177-9695
Mfr. Part No.TP2540N8-G
BrandMicrochip
HK$9.41
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. 165-6450
Mfr. Part No.DN3135K1-G
BrandMicrochip
HK$3.68
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. 177-9737
Mfr. Part No.VP2450N8-G
BrandMicrochip
HK$13.89
Each (In a Pack of 5)
units
P 160 mA 500 V 35 Ω SOT-89 Surface Mount 3 20 V Enhancement 3.5V 1.5V 1.6 W Single 1
RS Stock No. 829-3320
Mfr. Part No.DN2530N3-G
BrandMicrochip
HK$5.05
Each (In a Pack of 10)
units
N 175 mA 300 V 12 Ω TO-92 Through Hole 3 -20 V, +20 V Depletion 3.5V - 740 mW Single 1
RS Stock No. 829-3253
Mfr. Part No.LND150N8-G
BrandMicrochip
HK$5.05
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
RS Stock No. 879-3270
Mfr. Part No.TP2104N3-G
BrandMicrochip
HK$4.14
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. 177-2938
Mfr. Part No.MIC94052YC6-TR
BrandMicrochip
HK$4.05
Each (On a Reel of 3000)
units
P 2 A 6 V 180 mΩ SC-70 Surface Mount 6 -6 V - 1.2V 0.5V 270 mW Single 2
RS Stock No. 177-9707
Mfr. Part No.VN2106N3-G
BrandMicrochip
HK$2.40
Each (In a Bag of 1000)
units
N 300 mA 60 V 6 Ω TO-92 Through Hole 3 20 V Enhancement 2.4V 0.8V 1 W Single 1
RS Stock No. 177-9588
Mfr. Part No.2N7000-G
BrandMicrochip
HK$2.384
Each (In a Bag of 1000)
units
N 200 mA 60 V 5.3 Ω TO-92 Through Hole 3 30 V Enhancement 3V 0.8V 1 W Single 1
RS Stock No. 829-3235
Mfr. Part No.DN2540N3-G
BrandMicrochip
HK$6.08
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. 177-9708
Mfr. Part No.VN2460N8-G
BrandMicrochip
HK$7.36
Each (On a Reel of 2000)
units
N 200 mA 600 V 25 Ω TO-243AA Surface Mount 3 20 V Enhancement 4V 1.5V 1.6 W Single 1