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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製造零件編號PSMN5R6-100PS,127
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N 100 A 100 V 5.6 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 4V 2V 306 W Single 1
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製造零件編號PSMN5R6-100PS,127
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N 100 A 100 V 5.6 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 4V 2V 306 W Single 1
RS庫存編號 169-7207
製造零件編號PSMN3R4-30PL,127
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HK$7.278
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N 100 A 30 V 4.1 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 2.15V 1.3V 114 W Single 1
RS庫存編號 169-7205
製造零件編號PSMN1R8-30PL,127
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N 100 A 30 V 1.8 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 2.15V 1.3V 270 W Single 1
RS庫存編號 725-8376
製造零件編號PHN210T,118
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HK$5.124
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N 3.4 A 30 V 100 mΩ SOIC Surface Mount 8 -20 V, +20 V Enhancement 2.8V 1V 2 W Isolated 2
RS庫存編號 798-2959
製造零件編號PSMN3R4-30PL,127
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N 100 A 30 V 4.1 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 2.15V 1.3V 114 W Single 1
RS庫存編號 798-2924
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N 100 A 30 V 1.8 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 2.15V 1.3V 270 W Single 1
RS庫存編號 103-8398
製造零件編號2N7002,215
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N 300 mA 60 V 5 Ω SOT-23 (TO-236AB) Surface Mount 3 -30 V, +30 V Enhancement 2.5V 1V 830 mW Single 1
RS庫存編號 436-7379
製造零件編號2N7002,215
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N 300 mA 60 V 5 Ω SOT-23 (TO-236AB) Surface Mount 3 -30 V, +30 V Enhancement 2.5V 1V 830 mW Single 1
RS庫存編號 166-0269
製造零件編號PHN210T,118
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HK$3.164
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N 3.4 A 30 V 100 mΩ SOIC Surface Mount 8 -20 V, +20 V Enhancement 2.8V 1V 2 W Isolated 2
RS庫存編號 792-0894
製造零件編號BSS138BK,215
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HK$0.792
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N 360 mA 60 V 1.6 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 1.6V 0.48V 420 mW Single 1
RS庫存編號 124-2289
製造零件編號BSS138BK,215
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N 360 mA 60 V 1.6 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 1.6V 0.48V 420 mW Single 1
RS庫存編號 165-9977
製造零件編號NX3008PBKW,115
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P 200 mA 30 V 6.5 Ω SOT-323 (SC-70) Surface Mount 3 -8 V, +8 V Enhancement 1.1V 0.6V 830 mW Single 1
RS庫存編號 792-0891
製造零件編號BSS138P,215
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HK$0.571
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N 360 mA 60 V 1.6 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 1.5V 0.9V 420 mW Single 1
RS庫存編號 816-0582
製造零件編號NX3008PBKW,115
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P 200 mA 30 V 6.5 Ω SOT-323 (SC-70) Surface Mount 3 -8 V, +8 V Enhancement 1.1V 0.6V 830 mW Single 1
RS庫存編號 792-0901
製造零件編號BSS138PS,115
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N 320 mA 60 V 1.6 Ω SOT-363 (SC-88) Surface Mount 6 -20 V, +20 V Enhancement 1.5V 0.9V 320 mW Isolated 2
RS庫存編號 146-0858
製造零件編號BSS138PS,115
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HK$0.459
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N 320 mA 60 V 1.6 Ω SOT-363 (SC-88) Surface Mount 6 -20 V, +20 V Enhancement 1.5V 0.9V 320 mW Isolated 2
RS庫存編號 124-2336
製造零件編號NX2301P,215
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P 2 A 20 V 120 mΩ SOT-23 Surface Mount 3 -8 V, +8 V Enhancement 1.1V 0.5V 400 mW Single 1
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製造零件編號BSH203,215
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P 470 mA 30 V 900 mΩ SOT-23 (TO-236AB) Surface Mount 3 -8 V, +8 V Enhancement 0.68V 0.4V 417 mW Single 1
RS庫存編號 166-0610
製造零件編號BSH203,215
BrandNexperia
HK$1.126
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P 470 mA 30 V 900 mΩ SOT-23 (TO-236AB) Surface Mount 3 -8 V, +8 V Enhancement 0.68V 0.4V 417 mW Single 1