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 Maximum Gate Threshold Voltage Mounting Type Minimum Gate Threshold Voltage Pin Count Maximum Gate Source Voltage Channel Mode Transistor Configuration Maximum Power Dissipation Number of Elements per Chip
RS Stock No. 177-9854
Mfr. Part No.TN2540N8-G
HK$10.70
Each (In a Pack of 10)
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N 260 mA 400 V 12 Ω TO-243AA 2V Surface Mount 0.6V 3 20 V Enhancement Single 1.6 W 1
RS Stock No. 177-2938
Mfr. Part No.MIC94052YC6-TR
HK$3.46
Each (On a Reel of 3000)
units
P 2 A 6 V 180 mΩ SC-70 1.2V Surface Mount 0.5V 6 -6 V - Single 270 mW 2
RS Stock No. 177-9737
Mfr. Part No.VP2450N8-G
HK$13.89
Each (In a Pack of 5)
units
P 160 mA 500 V 35 Ω SOT-89 3.5V Surface Mount 1.5V 3 20 V Enhancement Single 1.6 W 1
RS Stock No. 177-9842
Mfr. Part No.TN2106K1-G
HK$3.742
Each (In a Pack of 20)
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N 280 mA 60 V 5 Ω TO-236AB 2V Surface Mount 0.6V 3 20 V Enhancement Single 360 mW 1
RS Stock No. 177-9734
Mfr. Part No.TN0106N3-G
HK$5.915
Each (In a Pack of 20)
units
N 350 mA 60 V 4.5 Ω TO-92 2V Through Hole 0.6V 3 20 V Enhancement Single 1 W 1
RS Stock No. 177-9691
Mfr. Part No.TN2106K1-G
HK$3.143
Each (On a Reel of 3000)
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N 280 mA 60 V 5 Ω TO-236AB 2V Surface Mount 0.6V 3 20 V Enhancement Single 360 mW 1
RS Stock No. 177-9689
Mfr. Part No.TN0106N3-G
HK$5.311
Each (In a Bag of 1000)
units
N 350 mA 60 V 4.5 Ω TO-92 2V Through Hole 0.6V 3 20 V Enhancement Single 1 W 1
RS Stock No. 177-9867
Mfr. Part No.TP2540N8-G
HK$11.626
Each (In a Pack of 5)
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P 125 mA 400 V 30 Ω TO-243AA 2.4V Surface Mount 1V 3 20 V Enhancement Single 1.6 W 1
RS Stock No. 177-3277
Mfr. Part No.DN2470K4-G
HK$6.90
Each (In a Pack of 10)
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N 170 mA 700 V 42 Ω TO-252 - Surface Mount - 4 20 V Depletion Single 2.5 W 2
RS Stock No. 177-9760
Mfr. Part No.2N7000-G
HK$2.64
Each (In a Pack of 25)
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N 200 mA 60 V 5.3 Ω TO-92 3V Through Hole 0.8V 3 30 V Enhancement Single 1 W 1
RS Stock No. 177-9865
Mfr. Part No.VN0104N3-G
HK$4.587
Each (In a Pack of 20)
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N 350 mA 40 V 5 Ω TO-92 2.4V Through Hole 0.8V 3 20 V Enhancement Single 1 W 1
RS Stock No. 177-2815
Mfr. Part No.DN2540N8-G
HK$5.20
Each (On a Reel of 2000)
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N 170 mA 400 V 25 Ω TO-243AA - Surface Mount - 3 20 V Depletion Single 1.6 W 2
RS Stock No. 177-9694
Mfr. Part No.TP0606N3-G
HK$3.63
Each (In a Bag of 1000)
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- - - - - - Through Hole - - - - - - -
RS Stock No. 177-9693
Mfr. Part No.TN2540N8-G
HK$5.66
Each (On a Reel of 2000)
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N 260 mA 400 V 12 Ω TO-243AA 2V Surface Mount 0.6V 3 20 V Enhancement Single 1.6 W 1
RS Stock No. 177-9707
Mfr. Part No.VN2106N3-G
HK$1.69
Each (In a Bag of 1000)
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N 300 mA 60 V 6 Ω TO-92 2.4V Through Hole 0.8V 3 20 V Enhancement Single 1 W 1
RS Stock No. 177-9850
Mfr. Part No.TN2106N3-G
HK$3.983
Each (In a Pack of 20)
units
N 300 mA 60 V 5 Ω TO-92 2V Through Hole 0.6V 3 20 V Enhancement Single 740 mW 1
RS Stock No. 177-3294
Mfr. Part No.DN2540N8-G
HK$6.82
Each (In a Pack of 10)
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N 170 mA 400 V 25 Ω TO-243AA - Surface Mount - 3 20 V Depletion Single 1.6 W 2
RS Stock No. 177-9587
Mfr. Part No.2N6661
HK$83.542
Each (In a Bag of 500)
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N 350 mA 90 V 5 Ω TO-39 2V Through Hole 0.8V 3 20 V Enhancement Single 6.25 W 1
RS Stock No. 177-9730
Mfr. Part No.VN2460N8-G
HK$5.85
Each (In a Pack of 10)
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N 200 mA 600 V 25 Ω TO-243AA 4V Surface Mount 1.5V 3 20 V Enhancement Single 1.6 W 1
RS Stock No. 177-9704
Mfr. Part No.VN0104N3-G
HK$2.64
Each (In a Bag of 1000)
units
N 350 mA 40 V 5 Ω TO-92 2.4V Through Hole 0.8V 3 20 V Enhancement Single 1 W 1