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 145-5690
製造零件編號FDG6320C
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N, P 140 mA, 220 mA 25 V 4 Ω, 10 Ω SOT-363 (SC-70) Surface Mount 6 -8 V, +8 V Enhancement - - 300 mW Isolated 2
RS庫存編號 178-0786
製造零件編號IRFP9240PBF
BrandVishay
HK$19.471
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RS庫存編號 145-8833
製造零件編號BSS316NH6327XTSA1
BrandInfineon
HK$0.376
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N 1.4 A 30 V 280 mΩ SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 2V 1.2V 500 mW Single 1
RS庫存編號 145-5369
製造零件編號FQP3P50
HK$9.752
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P 2.7 A 500 V 4.9 Ω TO-220AB Through Hole 3 -30 V, +30 V Enhancement - 3V 85 W Single 1
RS庫存編號 671-5118
製造零件編號FQP3P50
HK$11.472
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P 2.7 A 500 V 4.9 Ω TO-220AB Through Hole 3 -30 V, +30 V Enhancement - 3V 85 W Single 1
RS庫存編號 826-9042
製造零件編號IPB90N06S404ATMA2
BrandInfineon
HK$9.072
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N 90 A 60 V 4 mΩ D2PAK (TO-263) Surface Mount 3 -20 V, +20 V Enhancement 4V 2V 150 W Single 1
RS庫存編號 826-9412
製造零件編號BSS316NH6327XTSA1
BrandInfineon
HK$0.95
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N 1.4 A 30 V 280 mΩ SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 2V 1.2V 500 mW Single 1
RS庫存編號 178-0811
製造零件編號IRFI840GPBF
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HK$14.979
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RS庫存編號 541-0862
製造零件編號IRFP9240PBF
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HK$22.28
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P 12 A 200 V 500 mΩ TO-247AC Through Hole 3 -20 V, +20 V Enhancement - 2V 150 W Single 1
RS庫存編號 919-4895
製造零件編號IRLZ24NPBF
BrandInfineon
HK$5.992
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N 18 A 55 V 60 mΩ TO-220AB Through Hole 3 -16 V, +16 V Enhancement 2V 1V 45 W Single 1
RS庫存編號 919-4202
製造零件編號SI4925DDY-T1-GE3
BrandVishay
HK$4.685
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P 8 A 30 V 41 mΩ SOIC Surface Mount 8 -20 V, +20 V Enhancement - 1V 5 W Isolated 2
RS庫存編號 165-5610
製造零件編號IPB90N06S404ATMA2
BrandInfineon
HK$8.95
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N 90 A 60 V 4 mΩ D2PAK (TO-263) Surface Mount 3 -20 V, +20 V Enhancement 4V 2V 150 W Single 1
RS庫存編號 541-1231
製造零件編號IRLZ24NPBF
BrandInfineon
HK$5.60
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N 18 A 55 V 60 mΩ TO-220AB Through Hole 3 -16 V, +16 V Enhancement 2V 1V 45 W Single 1
RS庫存編號 540-8279
製造零件編號IRFI840GPBF
BrandVishay
HK$18.34
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N 4.6 A 500 V 850 mΩ TO-220FP Through Hole 3 -20 V, +20 V Enhancement - 2V 40 W Single 1
RS庫存編號 787-9052
製造零件編號SI4925DDY-T1-GE3
BrandVishay
HK$7.79
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P 8 A 30 V 41 mΩ SOIC Surface Mount 8 -20 V, +20 V Enhancement - 1V 5 W Isolated 2
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 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 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 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 911-4861
製造零件編號BSP300H6327XUSA1
BrandInfineon
HK$3.748
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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 - 1