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. 739-0224
Mfr. Part No.2N7000TA
HK$1.582
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N 200 mA 60 V 5 Ω TO-92 Through Hole 3 -30 V, +30 V Enhancement - 0.3V 400 mW Single 1
RS Stock No. 903-4074
Mfr. Part No.2N7000-D26Z
HK$0.974
Each (In a Pack of 100)
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N 200 mA 60 V 9 Ω TO-92 Through Hole 3 -40 V, +40 V Enhancement - 0.8V 400 mW Single 1
RS Stock No. 124-1310
Mfr. Part No.2N7000TA
HK$0.526
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N 200 mA 60 V 5 Ω TO-92 Through Hole 3 -30 V, +30 V Enhancement - 0.3V 400 mW Single 1
RS Stock No. 169-8553
Mfr. Part No.2N7000
HK$0.653
Each (On a Reel of 10000)
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N 200 mA 60 V 5 Ω TO-92 Through Hole 3 -20 V, +20 V Enhancement - 0.8V 400 mW Single 1
RS Stock No. 671-4733
Mfr. Part No.2N7000
HK$1.982
Each (In a Pack of 20)
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N 200 mA 60 V 5 Ω TO-92 Through Hole 3 -20 V, +20 V Enhancement - 0.8V 400 mW Single 1
RS Stock No. 807-5872
Mfr. Part No.FQP3N30
HK$5.328
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N 3.2 A 300 V 2.2 Ω TO-220 Through Hole 3 -30 V, +30 V Enhancement - 3V 55 W Single 1
RS Stock No. 145-5451
Mfr. Part No.FQP3N30
HK$6.733
Each (In a Tube of 50)
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N 3.2 A 300 V 2.2 Ω TO-220 Through Hole 3 -30 V, +30 V Enhancement - 3V 55 W Single 1
RS Stock No. 780-4755
Mfr. Part No.NTS2101PT1G
HK$1.96
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P 1.5 A 8 V 210 mΩ SOT-323 (SC-70) Surface Mount 3 -8 V, +8 V Enhancement - 0.45V 330 mW Single 1
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N, P 140 mA, 220 mA 25 V 4 Ω, 10 Ω SOT-363 (SC-70) Surface Mount 6 -8 V, +8 V Enhancement - - 300 mW Isolated 2
RS Stock No. 809-0880
Mfr. Part No.FDD4141
HK$6.773
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P 10.8 A 40 V 18.7 mΩ DPAK (TO-252) Surface Mount 3 -20 V, +20 V Enhancement - 1V 69 W Single 1
RS Stock No. 166-3620
Mfr. Part No.FQP3P20
HK$6.00
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P 1.8 A 200 V 2.7 Ω TO-220 Through Hole 3 -30 V, +30 V Enhancement - 3V 52 W Single 1
RS Stock No. 807-5875
Mfr. Part No.FQP3P20
HK$5.998
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P 1.8 A 200 V 2.7 Ω TO-220 Through Hole 3 -30 V, +30 V Enhancement - 3V 52 W Single 1
RS Stock No. 671-5244
Mfr. Part No.FQPF2N60C
HK$8.52
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N 2 A 600 V 4.7 Ω TO-220F Through Hole 3 -30 V, +30 V Enhancement - 2V 23 W Single 1
RS Stock No. 124-1417
Mfr. Part No.FDD4141
HK$3.634
Each (On a Reel of 2500)
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P 10.8 A 40 V 18.7 mΩ DPAK (TO-252) Surface Mount 3 -20 V, +20 V Enhancement - 1V 69 W Single 1
RS Stock No. 163-1139
Mfr. Part No.NTS2101PT1G
HK$0.795
Each (On a Reel of 3000)
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P 1.5 A 8 V 210 mΩ SOT-323 (SC-70) Surface Mount 3 -8 V, +8 V Enhancement - 0.45V 330 mW Single 1
RS Stock No. 145-4533
Mfr. Part No.FQPF2N60C
HK$6.895
Each (In a Tube of 50)
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N 2 A 600 V 4.7 Ω TO-220F Through Hole 3 -30 V, +30 V Enhancement - 2V 23 W Single 1
RS Stock No. 917-5465
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HK$2.263
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N, P 140 mA, 220 mA 25 V 4 Ω, 10 Ω SOT-363 (SC-70) Surface Mount 6 -8 V, +8 V Enhancement - - 300 mW Isolated 2
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P 2.7 A 500 V 4.9 Ω TO-220AB Through Hole 3 -30 V, +30 V Enhancement - 3V 85 W Single 1
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P 2.7 A 500 V 4.9 Ω TO-220AB Through Hole 3 -30 V, +30 V Enhancement - 3V 85 W Single 1
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P 3.9 A 250 V 620 mΩ TO-220F Through Hole 3 -30 V, +30 V Enhancement - 3V 50 W Single 1