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. 145-4548
Mfr. Part No.FDPF8N50NZF
MYR5.458
Each (In a Tube of 50)
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N 7 A 500 V 1 Ω TO-220F Through Hole 3 -25 V, +25 V Enhancement - 3V 40 W Single 1
RS Stock No. 739-4894
Mfr. Part No.FDPF8N50NZF
MYR6.72
Each
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N 7 A 500 V 1 Ω TO-220F Through Hole 3 -25 V, +25 V Enhancement - 3V 40 W Single 1
RS Stock No. 862-8779
Mfr. Part No.FQPF5N50CYDTU
MYR5.04
Each (In a Pack of 10)
units
N 5 A 500 V 1.4 Ω TO-220F Through Hole 3 -30 V, +30 V Enhancement 4V 2V 38 W Single 1
RS Stock No. 166-3621
Mfr. Part No.FQPF5N50CYDTU
MYR5.04
Each (In a Tube of 50)
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N 5 A 500 V 1.4 Ω TO-220F Through Hole 3 -30 V, +30 V Enhancement 4V 2V 38 W Single 1
RS Stock No. 761-4542
Mfr. Part No.MTP3055VL
MYR6.784
Each (In a Pack of 5)
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N 12 A 60 V 180 mΩ TO-220 Through Hole 3 -15 V, +15 V Enhancement - 1V 48 W Single 1
RS Stock No. 145-5555
Mfr. Part No.MTP3055VL
MYR5.607
Each (In a Tube of 50)
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N 12 A 60 V 180 mΩ TO-220 Through Hole 3 -15 V, +15 V Enhancement - 1V 48 W Single 1
RS Stock No. 841-312
Mfr. Part No.RFP70N06
MYR9.18
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N 70 A 60 V 14 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement - 2V 150 W Single 1
RS Stock No. 124-1664
Mfr. Part No.RFP70N06
MYR7.756
Each (In a Tube of 50)
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N 70 A 60 V 14 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement - 2V 150 W Single 1
RS Stock No. 671-0324
Mfr. Part No.BSS138
MYR1.08
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
MYR0.202
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. 809-0931
Mfr. Part No.FDD7N25LZTM
MYR3.644
Each (On a Tape of 10)
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N 6.2 A 250 V 570 mΩ DPAK (TO-252) Surface Mount 3 -20 V, +20 V Enhancement - 3V 56 W Single 1
RS Stock No. 166-3420
Mfr. Part No.FDD7N25LZTM
MYR1.622
Each (On a Reel of 2500)
units
N 6.2 A 250 V 570 mΩ DPAK (TO-252) Surface Mount 3 -20 V, +20 V Enhancement - 3V 56 W Single 1
RS Stock No. 690-0136
Mfr. Part No.BSS138LT3G
MYR0.828
Each (In a Pack of 25)
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N 200 mA 50 V 3.5 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 1.5V 0.5V 225 mW Single 1
RS Stock No. 145-4398
Mfr. Part No.FQA44N30
MYR21.714
Each (In a Tube of 30)
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N 43 A 300 V 69 mΩ TO-3PN Through Hole 3 -30 V, +30 V Enhancement - 3V - Single 1
RS Stock No. 545-2529
Mfr. Part No.BSS138LT1G
MYR0.828
Each (In a Pack of 25)
units
N 200 mA 50 V 3.5 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 1.5V - 225 mW Single 1
RS Stock No. 671-5064
Mfr. Part No.FQP27P06
MYR7.738
Each (In a Pack of 5)
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P 27 A 60 V 70 mΩ TO-220AB Through Hole 3 -25 V, +25 V Enhancement 4V 2V 120 W Single 1
RS Stock No. 178-4752
Mfr. Part No.FQP27P06
MYR6.315
Each (In a Tube of 50)
units
P 27 A 60 V 70 mΩ TO-220AB Through Hole 3 -25 V, +25 V Enhancement 4V 2V 120 W Single 1
RS Stock No. 103-2965
Mfr. Part No.BSS138LT1G
MYR0.218
Each (On a Reel of 3000)
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N 200 mA 50 V 3.5 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 1.5V - 225 mW Single 1
RS Stock No. 178-4687
Mfr. Part No.BSS138LT3G
MYR0.166
Each (On a Reel of 10000)
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RS Stock No. 808-8988
Mfr. Part No.FQA44N30
MYR25.89
Each
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N 43 A 300 V 69 mΩ TO-3PN Through Hole 3 -30 V, +30 V Enhancement - 3V - Single 1