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 Maximum Gate Threshold Voltage Minimum Gate Threshold Voltage Maximum Gate Source Voltage Package Type Mounting Type Pin Count Transistor Configuration Channel Mode Maximum Power Dissipation Automotive Standard
RS Stock No. 671-4733
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HK$1.982
Each (In a Pack of 20)
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N 200 mA 60 V 5 Ω - 0.8V -20 V, +20 V TO-92 Through Hole 3 Single Enhancement 400 mW -
RS Stock No. 124-1310
Mfr. Part No.2N7000TA
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N 200 mA 60 V 5 Ω - 0.3V -30 V, +30 V TO-92 Through Hole 3 Single Enhancement 400 mW -
RS Stock No. 739-0224
Mfr. Part No.2N7000TA
HK$1.582
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N 200 mA 60 V 5 Ω - 0.3V -30 V, +30 V TO-92 Through Hole 3 Single Enhancement 400 mW -
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 - 0.8V -40 V, +40 V TO-92 Through Hole 3 Single Enhancement 400 mW -
RS Stock No. 169-8553
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N 200 mA 60 V 5 Ω - 0.8V -20 V, +20 V TO-92 Through Hole 3 Single Enhancement 400 mW -
RS Stock No. 145-5451
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Each (In a Tube of 50)
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N 3.2 A 300 V 2.2 Ω - 3V -30 V, +30 V TO-220 Through Hole 3 Single Enhancement 55 W -
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 - 3V -30 V, +30 V TO-220 Through Hole 3 Single Enhancement 55 W -
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HK$2.263
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N, P 140 mA, 220 mA 25 V 4 Ω, 10 Ω - - -8 V, +8 V SOT-363 (SC-70) Surface Mount 6 Isolated Enhancement 300 mW -
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Mfr. Part No.FQP3P20
HK$5.998
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P 1.8 A 200 V 2.7 Ω - 3V -30 V, +30 V TO-220 Through Hole 3 Single Enhancement 52 W -
RS Stock No. 166-3620
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HK$6.257
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HK$6.773
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Each (In a Pack of 5)
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N 2 A 600 V 4.7 Ω - 2V -30 V, +30 V TO-220F Through Hole 3 Single Enhancement 23 W -
RS Stock No. 124-1417
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P 10.8 A 40 V 18.7 mΩ - 1V -20 V, +20 V DPAK (TO-252) Surface Mount 3 Single Enhancement 69 W -
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P 3.9 A 250 V 620 mΩ - 3V -30 V, +30 V TO-220F Through Hole 3 Single Enhancement 50 W -