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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RS庫存編號 921-1120
製造零件編號DMN6140L-7
HK$1.608
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N 2.9 A 60 V 170 mΩ SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 3V 1V 1.3 W Single 1
RS庫存編號 124-8739
製造零件編號IPG20N04S4L11ATMA1
BrandInfineon
HK$3.904
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N 20 A 40 V 15.5 mΩ TDSON Surface Mount 8 -16 V, +16 V Enhancement 2.2V 1.2V 41 W Isolated 2
RS庫存編號 542-9412
製造零件編號IRF820APBF
BrandVishay
HK$14.06
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N 2.5 A 500 V 3 Ω TO-220AB Through Hole 3 -30 V, +30 V Enhancement - 2V 50 W Single 1
RS庫存編號 688-7005
製造零件編號IRFP4321PBF
BrandInfineon
HK$31.88
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N 78 A 150 V 16 mΩ TO-247AC Through Hole 3 -30 V, +30 V Enhancement 5V 3V 310 W Single 1
RS庫存編號 541-0020
製造零件編號IRF740PBF
BrandVishay
HK$11.99
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N 10 A 400 V 550 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement - 2V 125 W Single 1
RS庫存編號 752-8211
製造零件編號BSP300H6327XUSA1
BrandInfineon
HK$7.822
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N 190 mA 800 V 20 Ω SOT-223 Surface Mount 3 + Tab -20 V, +20 V Enhancement 4V 2V 1.8 W Single 1
RS庫存編號 891-2914
製造零件編號TK17A65W,S5X(M
BrandToshiba
HK$11.612
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N 17 A 650 V 200 mΩ TO-220SIS Through Hole 3 -30 V, +30 V Enhancement 3.5V - 45 W Single 1
RS庫存編號 121-9547
製造零件編號DMP2305U-7
HK$0.555
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P 4.2 A 20 V 113 mΩ SOT-23 Surface Mount 3 -8 V, +8 V Enhancement 0.9V - 1.4 W Single 1
RS庫存編號 178-0833
製造零件編號IRF820APBF
BrandVishay
HK$6.59
毎管:50 個
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RS庫存編號 165-8287
製造零件編號IRFR8314TRPBF
BrandInfineon
HK$4.60
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N 179 A 30 V 3.1 mΩ DPAK (TO-252) Surface Mount 3 -20 V, +20 V Enhancement 2.2V 1.2V 125 W Single 1
RS庫存編號 165-8440
製造零件編號DMN6140L-7
HK$0.496
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N 2.9 A 60 V 170 mΩ SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 3V 1V 1.3 W Single 1
RS庫存編號 761-0499
製造零件編號STF9NK90Z
HK$19.09
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N 8 A 900 V 1.3 Ω TO-220FP Through Hole 3 -30 V, +30 V Enhancement 4.5V 3V 40 W Single 1
RS庫存編號 751-4256
製造零件編號DMP2305U-7
HK$0.922
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P 4.2 A 20 V 113 mΩ SOT-23 Surface Mount 3 -8 V, +8 V Enhancement 0.9V - 1.4 W Single 1
RS庫存編號 798-3003
製造零件編號PSMN5R6-100PS,127
BrandNexperia
HK$16.00
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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 756-0382
製造零件編號3SK294(TE85L,F)
BrandToshiba
HK$1.845
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N 30 mA 12.5 V - USQ Surface Mount 4 -8 V, +8 V Depletion 1.5V - 100 mW Single 1
RS庫存編號 915-5027
製造零件編號IRFR8314TRPBF
BrandInfineon
HK$7.946
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N 179 A 30 V 3.1 mΩ DPAK (TO-252) Surface Mount 3 -20 V, +20 V Enhancement 2.2V 1.2V 125 W Single 1
RS庫存編號 825-9106
製造零件編號IPG20N04S4L11ATMA1
BrandInfineon
HK$6.897
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N 20 A 40 V 15.5 mΩ TDSON Surface Mount 8 -16 V, +16 V Enhancement 2.2V 1.2V 41 W Isolated 2
RS庫存編號 756-2782
製造零件編號SSM6N16FU(TE85L,F)
BrandToshiba
HK$1.845
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N 100 mA 20 V 15 Ω US Surface Mount 6 -10 V, +10 V Enhancement 1.1V - 200 mW Isolated 2
RS庫存編號 808-4138
製造零件編號NTF6P02T3G
HK$5.376
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P 8.4 A 20 V 70 mΩ SOT-223 Surface Mount 3 + Tab -8 V, +8 V Enhancement 1V - 8.3 W Single 1
RS庫存編號 904-7345
製造零件編號C2M1000170D
BrandWolfspeed
HK$44.02
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N 5 A 1700 V 1.4 Ω TO-247 Through Hole 3 -5 V, +20 V Enhancement 3.1V 2.4V 69 W Single 1