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 like 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 like standard MOSFETs but they are designed to handle a higher level of power.

N-Channel vs. P-Channel MOSFETs

N-Channel MOSFETs contain additional electrons which are free to move around. They are a 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.


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RS Stock No. 671-0769
Mfr. Part No.FDS9926A
$0.966
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N 6.5 A 20 V 30 mΩ SOIC Surface Mount 8 -10 V, +10 V Enhancement - 0.6V 2 W Isolated 2
RS Stock No. 826-8879
Mfr. Part No.IRF7319TRPBF
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$1.438
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N, P 4.9 A, 6.5 A 30 V 46 mΩ, 98 mΩ SOIC Surface Mount 8 -20 V, +20 V Enhancement 1V 1V 2 W Isolated 2
RS Stock No. 919-4772
Mfr. Part No.IRF4905PBF
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$2.373
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P 74 A 55 V 20 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 4V 2V 200 W Single 1
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Mfr. Part No.IPW60R070C6FKSA1
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N 53 A 650 V 70 mΩ TO-247 Through Hole 3 -20 V, +20 V Enhancement 3.5V 2.5V 391 W Single 1
RS Stock No. 919-4886
Mfr. Part No.IRF9540NPBF
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$1.47
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P 23 A 100 V 117 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 4V 2V 140 W Single 1
RS Stock No. 178-1506
Mfr. Part No.IRLR120NPBF
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$1.596
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Mfr. Part No.BUZ11_NR4941
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N 30 A 50 V 40 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement - 2.1V 75 W Single 1
RS Stock No. 688-7204
Mfr. Part No.IRLB3034PBF
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$5.23
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N 343 A 40 V 2 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 2.5V 1V 375 W Single 1
RS Stock No. 541-1225
Mfr. Part No.IRF9540NPBF
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P 23 A 100 V 117 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 4V 2V 140 W Single 1
RS Stock No. 124-9024
Mfr. Part No.IRLB3034PBF
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N 343 A 40 V 2 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 2.5V 1V 375 W Single 1
RS Stock No. 671-5095
Mfr. Part No.FQP33N10
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N 33 A 100 V 52 mΩ TO-220AB Through Hole 3 -25 V, +25 V Enhancement - 2V 127 W Single 1
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Mfr. Part No.DMC3025LSD-13
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N, P 2.3 A, 8.5 A 30 V 32 mΩ, 85 mΩ SOIC Surface Mount 8 -20 V, +20 V Enhancement 2V - 1.5 W Isolated 2
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Mfr. Part No.IRF640NPBF
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$1.25
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N 18 A 200 V 150 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 4V 2V 150 W Single 1
RS Stock No. 124-1703
Mfr. Part No.FDN337N
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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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Mfr. Part No.FDN337N
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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
RS Stock No. 541-0014
Mfr. Part No.IRF640NPBF
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$1.83
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N 18 A 200 V 150 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 4V 2V 150 W Single 1
RS Stock No. 700-3220
Mfr. Part No.IRFI4212H-117P
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N 11 A 100 V 73 mΩ TO-220 Through Hole 5 -20 V, +20 V Enhancement 5V 3V 18 W Series 2
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N 33 A 100 V 52 mΩ TO-220AB Through Hole 3 -25 V, +25 V Enhancement - 2V 127 W Single 1
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N 30 A 200 V 75 mΩ TO-247AC Through Hole 3 -20 V, +20 V Enhancement 4V 2V 214 W Single 1
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N 11 A 100 V 73 mΩ TO-220 Through Hole 5 -20 V, +20 V Enhancement 5V 3V 18 W Series 2