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. For more information about MOSFETs, please see our complete guide to MOSFETs.


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. 919-4915
Mfr. Part No.IRF5210PBF
BrandInfineon
£1.336
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P 40 A 100 V 60 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 4V 2V 200 W Single 1
RS Stock No. 124-1726
Mfr. Part No.NDT452AP
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P 5 A 30 V 65 mΩ SOT-223 Surface Mount 3 + Tab -20 V, +20 V Enhancement - 1V 3 W Single 1
RS Stock No. 671-1100
Mfr. Part No.NDT452AP
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P 5 A 30 V 65 mΩ SOT-223 Surface Mount 3 + Tab -20 V, +20 V Enhancement - 1V 3 W Single 1
RS Stock No. 325-7625
Mfr. Part No.RFP50N06
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N 50 A 60 V 22 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement - 2V 131 W Single 1
RS Stock No. 545-0135
Mfr. Part No.BSS123LT1G
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N 170 mA 100 V 6 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 2.8V - 225 mW Single 1
RS Stock No. 124-1672
Mfr. Part No.RFP50N06
£0.961
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N 50 A 60 V 22 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement - 2V 131 W Single 1
RS Stock No. 671-0435
Mfr. Part No.FDN340P
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P 2 A 20 V 70 mΩ SOT-23 Surface Mount 3 -8 V, +8 V Enhancement - 0.4V 500 mW Single 1
RS Stock No. 124-1704
Mfr. Part No.FDN340P
£0.075
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P 2 A 20 V 70 mΩ SOT-23 Surface Mount 3 -8 V, +8 V Enhancement - 0.4V 500 mW Single 1
RS Stock No. 103-2944
Mfr. Part No.BSS123LT1G
£0.027
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N 170 mA 100 V 6 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 2.8V - 225 mW Single 1
RS Stock No. 892-2217
Mfr. Part No.BSS84PH6327XTSA2
BrandInfineon
£0.075
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P 170 mA 60 V 12 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 2V 1V 360 mW Single 1
RS Stock No. 911-4836
Mfr. Part No.SPP20N60C3HKSA1
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£3.36
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N 20.7 A 600 V 190 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 3.9V 2.1V 208 W Single 1
RS Stock No. 462-3376
Mfr. Part No.SPP20N60C3HKSA1
BrandInfineon
£4.38
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N 21 A 600 V 190 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 3.9V 2.1V 208 W Single 1
RS Stock No. 919-0023
Mfr. Part No.IRF510PBF
BrandVishay
£0.568
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N 5.6 A 100 V 540 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement - 2V 43 W Single 1
RS Stock No. 541-0553
Mfr. Part No.IRFD9120PBF
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£0.73
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RS Stock No. 708-5134
Mfr. Part No.IRF510PBF
BrandVishay
£0.568
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N 5.6 A 100 V 540 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement - 2V 43 W Single 1
RS Stock No. 178-0917
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BrandVishay
£0.464
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Mfr. Part No.BSS138LT3G
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N 200 mA 50 V 3.5 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 1.5V 0.5V 225 mW Single 1
RS Stock No. 178-4687
Mfr. Part No.BSS138LT3G
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RS Stock No. 545-2529
Mfr. Part No.BSS138LT1G
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N 200 mA 50 V 3.5 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 1.5V - 225 mW Single 1
RS Stock No. 103-2965
Mfr. Part No.BSS138LT1G
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