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 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. 752-7773
Mfr. Part No.2N7002H6327XTSA2
BrandInfineon
TWD1.10
Each (In a Pack of 100)
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N 300 mA 60 V 4 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 2.5V 1.5V 500 mW Single 1
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Mfr. Part No.FDT86113LZ
TWD20.60
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N 3.3 A 100 V 189 mΩ SOT-223 Surface Mount 3 + Tab -20 V, +20 V Enhancement - 1V 2.2 W Single 1
RS Stock No. 166-1838
Mfr. Part No.FDT86113LZ
TWD9.20
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N 3.3 A 100 V 189 mΩ SOT-223 Surface Mount 3 + Tab -20 V, +20 V Enhancement - 1V 2.2 W Single 1
RS Stock No. 792-0894
Mfr. Part No.BSS138BK,215
BrandNexperia
TWD2.30
Each (On a Reel of 50)
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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 Stock No. 124-9035
Mfr. Part No.2N7002H6327XTSA2
BrandInfineon
TWD1.00
Each (On a Reel of 3000)
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N 300 mA 60 V 4 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 2.5V 1.5V 500 mW Single 1
RS Stock No. 124-2289
Mfr. Part No.BSS138BK,215
BrandNexperia
TWD1.40
Each (On a Reel of 3000)
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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
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Mfr. Part No.DMG2307L-7
TWD2.30
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P 2 A 30 V 134 mΩ SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 3V - 1.9 W Single 1
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Mfr. Part No.DMP3099L-7
TWD2.80
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P 2.9 A 30 V 99 mΩ SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 2.1V - 1.08 W Single 1
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Mfr. Part No.SUP57N20-33-E3
BrandVishay
TWD61.90
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N 57 A 200 V 33 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement - 2V 3.75 W Single 1
RS Stock No. 122-2891
Mfr. Part No.DMP3160L-7
TWD2.00
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P 2 A 30 V 190 mΩ SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 2.1V - 1.08 W Single 1
RS Stock No. 125-1117
Mfr. Part No.SKM180A020
BrandSemikron
TWD2,729.00
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N 180 A 200 V 11 mΩ SEMITRANSM1 Surface Mount 4 -20 V, +20 V Enhancement 4V 2.1V - Single 1
RS Stock No. 121-9599
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TWD1.60
Each (On a Reel of 3000)
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P 2 A 30 V 134 mΩ SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 3V - 1.9 W Single 1
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Mfr. Part No.SUP57N20-33-E3
BrandVishay
TWD146.00
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N 57 A 200 V 33 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement - 2V 3.75 W Single 1
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TWD1.50
Each (On a Reel of 3000)
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P 2.9 A 30 V 99 mΩ SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 2.1V - 1.08 W Single 1
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TWD3.70
Each (On a Reel of 3000)
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N 2.2 A 30 V 65 mΩ SOT-23 Surface Mount 3 -8 V, +8 V Enhancement 1V 0.4V 500 mW Single 1
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N 5.6 A 100 V 375 mΩ SOT-223 Surface Mount 3 + Tab -20 V, +20 V Enhancement - 1.4V 10.42 W Single 1