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. 462-3449
Mfr. Part No.SPW20N60C3FKSA1
BrandInfineon
$10.82
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N 21 A 650 V 190 mΩ TO-247 Through Hole 3 -20 V, +20 V Enhancement 3.9V 2.1V 208 W Single 1
RS Stock No. 911-4830
Mfr. Part No.SPW20N60C3FKSA1
BrandInfineon
$7.19
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N 20.7 A 650 V 190 mΩ TO-247 Through Hole 3 -20 V, +20 V Enhancement 3.9V 2.1V 208 W Single 1
RS Stock No. 919-4898
Mfr. Part No.IRLZ34NPBF
BrandInfineon
$1.51
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N 30 A 55 V 35 mΩ TO-220AB Through Hole 3 -16 V, +16 V Enhancement 2V 1V 68 W Single 1
RS Stock No. 913-4045
Mfr. Part No.IRLB8743PBF
BrandInfineon
$1.71
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N 150 A 30 V 3 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 2.35V 1.35V 140 W Single 1
RS Stock No. 168-6102
Mfr. Part No.STP30NF10
$1.99
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N 35 A 100 V 45 mΩ TO-220 Through Hole 3 -20 V, +20 V Enhancement 4V 2V 115 W Single 1
RS Stock No. 485-7721
Mfr. Part No.STP55NF06L
$2.29
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N 55 A 60 V 18 mΩ TO-220 Through Hole 3 -16 V, +16 V Enhancement - 1V 95 W Single 1
RS Stock No. 920-8795
Mfr. Part No.STP55NF06L
$1.94
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N 55 A 60 V 18 mΩ TO-220 Through Hole 3 -16 V, +16 V Enhancement - 1V 95 W Single 1
RS Stock No. 541-1247
Mfr. Part No.IRLZ34NPBF
BrandInfineon
$1.76
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N 30 A 55 V 35 mΩ TO-220AB Through Hole 3 -16 V, +16 V Enhancement 2V 1V 68 W Single 1
RS Stock No. 919-4817
Mfr. Part No.IRF640NPBF
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$1.35
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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. 725-9325
Mfr. Part No.IRLB8743PBF
BrandInfineon
$2.02
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N 150 A 30 V 3 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 2.35V 1.35V 140 W Single 1
RS Stock No. 541-0014
Mfr. Part No.IRF640NPBF
BrandInfineon
$1.57
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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. 485-7585
Mfr. Part No.STP30NF10
$2.34
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N 35 A 100 V 45 mΩ TO-220 Through Hole 3 -20 V, +20 V Enhancement 4V 2V 115 W Single 1
RS Stock No. 124-9058
Mfr. Part No.IPP80P03P4L04AKSA1
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$2.92
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P 80 A 30 V 7 mΩ TO-220 Through Hole 3 -16 V, +5 V Enhancement 2V 1V 137 W Single 1
RS Stock No. 178-1510
Mfr. Part No.IRLU9343PBF
BrandInfineon
$1.61
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RS Stock No. 823-5554
Mfr. Part No.IPP80P03P4L04AKSA1
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$3.44
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P 80 A 30 V 7 mΩ TO-220 Through Hole 3 -16 V, +5 V Enhancement 2V 1V 137 W Single 1
RS Stock No. 145-4614
Mfr. Part No.FQPF9N50CF
$2.09
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N 9 A 500 V 850 mΩ TO-220F Through Hole 3 -30 V, +30 V Enhancement - 2V 44 W Single 1
RS Stock No. 650-4643
Mfr. Part No.IRLU9343PBF
BrandInfineon
$1.88
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P 20 A 55 V 105 mΩ IPAK (TO-251) Through Hole 3 -20 V, +20 V Enhancement 1V 1V 79 W Single 1
RS Stock No. 542-9440
Mfr. Part No.IRF840APBF
BrandVishay
$2.80
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N 8 A 500 V 850 mΩ TO-220AB Through Hole 3 -30 V, +30 V Enhancement - 2V 125 W Single 1
RS Stock No. 178-0835
Mfr. Part No.IRF840APBF
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$2.09
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RS Stock No. 485-7901
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$5.23
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