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 Stock No. 708-5134
Mfr. Part No.IRF510PBF
BrandVishay
€0.701
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N 5.6 A 100 V 540 mΩ TO-220AB - Through Hole 2V 3 -20 V, +20 V Enhancement 43 W Single 1
RS Stock No. 919-0023
Mfr. Part No.IRF510PBF
BrandVishay
€0.646
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N 5.6 A 100 V 540 mΩ TO-220AB - Through Hole 2V 3 -20 V, +20 V Enhancement 43 W Single 1
RS Stock No. 671-4736
Mfr. Part No.BS170
€0.284
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N 500 mA 60 V 5 Ω TO-92 3V Through Hole 0.8V 3 -20 V, +20 V Enhancement 830 mW Single 1
RS Stock No. 124-1745
Mfr. Part No.BS170
€0.091
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N 500 mA 60 V 5 Ω TO-92 3V Through Hole 0.8V 3 -20 V, +20 V Enhancement 830 mW Single 1
RS Stock No. 178-0786
Mfr. Part No.IRFP9240PBF
BrandVishay
€2.117
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RS Stock No. 541-0862
Mfr. Part No.IRFP9240PBF
BrandVishay
€2.73
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P 12 A 200 V 500 mΩ TO-247AC - Through Hole 2V 3 -20 V, +20 V Enhancement 150 W Single 1
RS Stock No. 177-5480
Mfr. Part No.IRF140
BrandMagnatec
€32.00
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N 28 A 100 V 89 mΩ TO-3 4V Through Hole - 3 -20 V, +20 V Enhancement 125 W Single 1
RS Stock No. 911-4852
Mfr. Part No.BSC120N03LSGATMA1
BrandInfineon
€0.216
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N 39 A 30 V 16.5 mΩ TDSON 2.2V Surface Mount 1V 8 -20 V, +20 V Enhancement 2.5 W - 1
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Mfr. Part No.IRF140
BrandMagnatec
€35.20
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N 28 A 100 V 89 mΩ TO-3 4V Through Hole - 3 -20 V, +20 V Enhancement 125 W Single 1
RS Stock No. 752-8173
Mfr. Part No.BSC120N03LSGATMA1
BrandInfineon
€0.496
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N 39 A 30 V 16.5 mΩ TDSON 2.2V Surface Mount 1V 8 -20 V, +20 V Enhancement 2.5 W Single 1
RS Stock No. 178-0913
Mfr. Part No.IRLD110PBF
BrandVishay
€0.571
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N 1 A 100 V 540 mΩ HVMDIP - Through Hole 1V 4 -10 V, +10 V Enhancement 1.3 W Single 1
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Mfr. Part No.IRLD110PBF
BrandVishay
€0.81
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N 1 A 100 V 540 mΩ HVMDIP - Through Hole 1V 4 -10 V, +10 V Enhancement 1.3 W Single 1
RS Stock No. 688-7204
Mfr. Part No.IRLB3034PBF
BrandInfineon
€2.295
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N 343 A 40 V 2 mΩ TO-220AB 2.5V Through Hole 1V 3 -20 V, +20 V Enhancement 375 W Single 1
RS Stock No. 890-2695
Mfr. Part No.2SK3565,S5Q(J
BrandToshiba
€1.636
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N 5 A 900 V 2.5 Ω SC-67 4V Through Hole - 3 -30 V, +30 V Enhancement 45 W Single 1
RS Stock No. 124-9024
Mfr. Part No.IRLB3034PBF
BrandInfineon
€2.095
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N 343 A 40 V 2 mΩ TO-220AB 2.5V Through Hole 1V 3 -20 V, +20 V Enhancement 375 W Single 1
RS Stock No. 541-1039
Mfr. Part No.IRFD110PBF
BrandVishay
€2.20
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N 1 A 100 V 540 mΩ HVMDIP - Through Hole 2V 4 -20 V, +20 V Enhancement 1.3 W Single 1
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Mfr. Part No.IRFD110PBF
BrandVishay
€0.447
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N 1 A 100 V 540 mΩ HVMDIP - Through Hole 2V 4 -20 V, +20 V Enhancement 1.3 W Single 1
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N 200 mA 60 V 5 Ω TO-92 - Through Hole 0.8V 3 -20 V, +20 V Enhancement 400 mW Single 1
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BrandInfineon
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