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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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. 761-0590
Mfr. Part No.STQ3N45K3-AP
$1.228
Each (In a Pack of 5)
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N 600 mA 450 V 3.8 Ω TO-92 Through Hole 3 -30 V, +30 V Enhancement 4.5V 3V 2.5 W Single 1
RS Stock No. 124-1694
Mfr. Part No.BSS138
$0.069
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. 650-4205
Mfr. Part No.IRF9540SPBF
BrandVishay
$5.12
Each (In a Pack of 5)
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P 19 A 100 V 200 mΩ D2PAK (TO-263) Surface Mount 3 -20 V, +20 V Enhancement - 2V 150 W Single 1
RS Stock No. 168-7549
Mfr. Part No.STQ3N45K3-AP
$0.491
Each (On a Tape of 2000)
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N 600 mA 450 V 3.8 Ω TO-92 Through Hole 3 -30 V, +30 V Enhancement 4.5V 3V 2.5 W Single 1
RS Stock No. 166-2179
Mfr. Part No.FDA24N40F
$4.20
Each (In a Tube of 30)
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N 23 A 400 V 190 mΩ TO-3PN Through Hole 3 -30 V, +30 V Enhancement - 3V 235 W Single 1
RS Stock No. 914-8154
Mfr. Part No.IRF540NPBF
BrandInfineon
$1.482
Each (In a Pack of 20)
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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. 903-4134
Mfr. Part No.FDA24N40F
$4.94
Each (In a Pack of 5)
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N 23 A 400 V 190 mΩ TO-3PN Through Hole 3 -30 V, +30 V Enhancement - 3V 235 W Single 1
RS Stock No. 922-8011
Mfr. Part No.ZXMP4A16GTA
$0.595
Each (On a Reel of 1000)
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P 6.4 A 40 V 100 mΩ SOT-223 Surface Mount 3 + Tab -20 V, +20 V Enhancement - 1V 3.9 W Single 1
RS Stock No. 708-2469
Mfr. Part No.ZXMP4A16GTA
$1.149
Each (In a Pack of 10)
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P 6.4 A 40 V 100 mΩ SOT-223 Surface Mount 3 + Tab -20 V, +20 V Enhancement - 1V 3.9 W Single 1
RS Stock No. 168-8842
Mfr. Part No.STW56N60M2
$9.581
Each (In a Tube of 30)
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N 52 A 650 V 55 mΩ TO-247 Through Hole 3 -25 V, +25 V Enhancement 4V 2V 350 W Single 1
RS Stock No. 876-5720
Mfr. Part No.STW56N60M2
$10.93
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N 52 A 650 V 55 mΩ TO-247 Through Hole 3 -25 V, +25 V Enhancement 4V 2V 350 W Single 1
RS Stock No. 168-6215
Mfr. Part No.STP4NK60ZFP
$2.142
Each (In a Tube of 50)
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N 4 A 600 V 2 Ω TO-220FP Through Hole 3 -30 V, +30 V Enhancement 4.5V 3V 25 W Single 1
RS Stock No. 486-2313
Mfr. Part No.STP4NK60ZFP
$2.756
Each (In a Pack of 5)
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N 4 A 600 V 2 Ω TO-220FP Through Hole 3 -30 V, +30 V Enhancement 4.5V 3V 25 W Single 1
RS Stock No. 124-1745
Mfr. Part No.BS170
$0.176
Each (In a Bag of 1000)
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N 500 mA 60 V 5 Ω TO-92 Through Hole 3 -20 V, +20 V Enhancement 3V 0.8V 830 mW Single 1
RS Stock No. 671-4736
Mfr. Part No.BS170
$0.61
Each (In a Pack of 10)
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N 500 mA 60 V 5 Ω TO-92 Through Hole 3 -20 V, +20 V Enhancement 3V 0.8V 830 mW Single 1
RS Stock No. 919-4794
Mfr. Part No.IRF540NPBF
BrandInfineon
$1.451
Each (In a Tube of 50)
units
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. 913-4036
Mfr. Part No.IRLB8721PBF
BrandInfineon
$1.25
Each (In a Tube of 50)
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N 62 A 30 V 9 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 2.35V 1.35V 65 W Single 1
RS Stock No. 787-0982
Mfr. Part No.AUIRFR8403
BrandInfineon
$2.866
Each (In a Tube of 5)
units
N 100 A, 127 A 40 V 3.1 mΩ DPAK (TO-252) Surface Mount 3 -20 V, +20 V Enhancement 3.9V 2.2V 99 W Single 1
RS Stock No. 708-5134
Mfr. Part No.IRF510PBF
BrandVishay
$1.291
Each (In a Pack of 10)
units
N 5.6 A 100 V 540 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement - 2V 43 W Single 1
RS Stock No. 163-1136
Mfr. Part No.NTMS4816NR2G
$0.381
Each (On a Reel of 2500)
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N 11 A 30 V 16 mΩ SOIC Surface Mount 8 -20 V, +20 V Enhancement 3V - 2.04 W Single 1