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. 700-3198
Mfr. Part No.IRFI4019H-117P
BrandInfineon
$3.84
Each (In a Pack of 2)
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N 8.7 A 150 V 95 mΩ TO-220 Through Hole 5 -20 V, +20 V Enhancement 4.9V 3V 18 W Series 2
RS Stock No. 671-0324
Mfr. Part No.BSS138
$0.408
Each (In a Pack of 10)
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N 220 mA 50 V 3.5 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 1.5V 0.8V 360 mW Single 1
RS Stock No. 124-1694
Mfr. Part No.BSS138
$0.06
Each (On a Reel of 3000)
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N 220 mA 50 V 3.5 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 1.5V 0.8V 360 mW Single 1
RS Stock No. 752-7773
Mfr. Part No.2N7002H6327XTSA2
BrandInfineon
$0.124
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
RS Stock No. 124-9035
Mfr. Part No.2N7002H6327XTSA2
BrandInfineon
$0.068
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. 159-6516
Mfr. Part No.IRFP460BPBF
BrandVishay
$4.28
Each (In a Tube of 25)
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N 20 A 500 V 250 mΩ TO-247AC Through Hole 3 -20 V, +20 V Enhancement - 2V 278 W Single 1
RS Stock No. 787-9140
Mfr. Part No.IRFP460BPBF
BrandVishay
$7.00
Each
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N 20 A 500 V 250 mΩ TO-247AC Through Hole 3 -20 V, +20 V Enhancement - 2V 278 W Single 1
RS Stock No. 541-0020
Mfr. Part No.IRF740PBF
BrandVishay
$2.34
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N 10 A 400 V 550 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement - 2V 125 W Single 1
RS Stock No. 178-0812
Mfr. Part No.IRF740PBF
BrandVishay
$1.97
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N 10 A 400 V 550 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement - 2V 125 W Single 1
RS Stock No. 914-8154
Mfr. Part No.IRF540NPBF
BrandInfineon
$1.38
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N 33 A 100 V 44 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 4V 2V 130 W Single 1
RS Stock No. 920-8840
Mfr. Part No.STP75NF75
$2.37
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N 80 A 75 V 11 mΩ TO-220 Through Hole 3 -20 V, +20 V Enhancement 4V 2V 300 W Single 1
RS Stock No. 919-4794
Mfr. Part No.IRF540NPBF
BrandInfineon
$1.38
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N 33 A 100 V 44 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 4V 2V 130 W Single 1
RS Stock No. 485-7844
Mfr. Part No.STP75NF75
$2.78
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N 80 A 75 V 11 mΩ TO-220 Through Hole 3 -20 V, +20 V Enhancement 4V 2V 300 W Single 1
RS Stock No. 145-1758
Mfr. Part No.IRF830ASPBF
BrandVishay
$2.17
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N 5 A 500 V 1.4 Ω D2PAK (TO-263) Surface Mount 3 -30 V, +30 V Enhancement - 2V 3.1 W Single 1
RS Stock No. 650-4110
Mfr. Part No.IRF830ASPBF
BrandVishay
$2.64
Each (In a Pack of 5)
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N 5 A 500 V 1.4 Ω D2PAK (TO-263) Surface Mount 3 -30 V, +30 V Enhancement - 2V 3.1 W Single 1
RS Stock No. 582-476
Mfr. Part No.TPC8118(TE12L,Q)
BrandToshiba
$0.828
Each (In a Pack of 5)
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P 13 A 30 V 7 mΩ - Surface Mount 8 -20 V, +20 V Enhancement 2V - 1.9 W Single 1
RS Stock No. 919-4769
Mfr. Part No.IRFZ44NPBF
BrandInfineon
$1.47
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N 49 A 55 V 17.5 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 4V 2V 94 W Single 1
RS Stock No. 162-9739
Mfr. Part No.CSD19536KTTT
$7.71
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N 272 A 100 V 2.8 mΩ D2PAK (TO-263) Surface Mount 3 -20 V, +20 V Enhancement - - 375 W Single 1
RS Stock No. 900-9857
Mfr. Part No.CSD19536KTTT
$8.56
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N 272 A 100 V 2.8 mΩ D2PAK (TO-263) Surface Mount 3 -20 V, +20 V Enhancement - - 375 W Single 1
RS Stock No. 540-9777
Mfr. Part No.IRFZ44NPBF
BrandInfineon
$1.71
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N 49 A 55 V 17.5 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 4V 2V 94 W Single 1
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