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. 170-3030
Mfr. Part No.MDP18N50BTH
BrandMagnaChip
HK$13.999
Each (In a Tube of 50)
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N 18 A 500 V 270 mΩ 4V - -30 V, +30 V TO-220 Through Hole 3 Single Enhancement 236 W -
RS Stock No. 178-0812
Mfr. Part No.IRF740PBF
BrandVishay
HK$10.786
Each (In a Tube of 50)
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N 10 A 400 V 550 mΩ - 2V -20 V, +20 V TO-220AB Through Hole 3 Single Enhancement 125 W -
RS Stock No. 178-0833
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BrandVishay
HK$6.59
Each (In a Tube of 50)
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- - - - - - - - - - - - - -
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Mfr. Part No.PSMN5R6-100PS,127
BrandNexperia
HK$12.183
Each (On a Reel of 1000)
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N 100 A 100 V 5.6 mΩ 4V 2V -20 V, +20 V TO-220AB Through Hole 3 Single Enhancement 306 W -
RS Stock No. 124-8739
Mfr. Part No.IPG20N04S4L11ATMA1
BrandInfineon
HK$3.569
Each (On a Reel of 5000)
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N 20 A 40 V 15.5 mΩ 2.2V 1.2V -16 V, +16 V TDSON Surface Mount 8 Isolated Enhancement 41 W -
RS Stock No. 542-9507
Mfr. Part No.IRFBC30PBF
BrandVishay
HK$11.79
Each
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N 3.6 A 600 V 2.2 Ω - 2V -20 V, +20 V TO-220AB Through Hole 3 Single Enhancement 74 W -
RS Stock No. 121-9547
Mfr. Part No.DMP2305U-7
HK$0.555
Each (On a Reel of 3000)
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P 4.2 A 20 V 113 mΩ 0.9V - -8 V, +8 V SOT-23 Surface Mount 3 Single Enhancement 1.4 W -
RS Stock No. 915-5027
Mfr. Part No.IRFR8314TRPBF
BrandInfineon
HK$7.946
Each (In a Pack of 10)
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N 179 A 30 V 3.1 mΩ 2.2V 1.2V -20 V, +20 V DPAK (TO-252) Surface Mount 3 Single Enhancement 125 W -
RS Stock No. 751-4256
Mfr. Part No.DMP2305U-7
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P 4.2 A 20 V 113 mΩ 0.9V - -8 V, +8 V SOT-23 Surface Mount 3 Single Enhancement 1.4 W -
RS Stock No. 921-1120
Mfr. Part No.DMN6140L-7
HK$1.608
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N 2.9 A 60 V 170 mΩ 3V 1V -20 V, +20 V SOT-23 Surface Mount 3 Single Enhancement 1.3 W -
RS Stock No. 825-9106
Mfr. Part No.IPG20N04S4L11ATMA1
BrandInfineon
HK$6.897
Each (In a Pack of 20)
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N 20 A 40 V 15.5 mΩ 2.2V 1.2V -16 V, +16 V TDSON Surface Mount 8 Isolated Enhancement 41 W -
RS Stock No. 799-5056
Mfr. Part No.TK17A65W,S5X(M
BrandToshiba
HK$9.75
Each (In a Pack of 5)
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N 17 A 650 V 200 mΩ 3.5V - -30 V, +30 V TO-220SIS Through Hole 3 Single Enhancement 45 W -
RS Stock No. 911-4861
Mfr. Part No.BSP300H6327XUSA1
BrandInfineon
HK$3.748
Each (On a Reel of 1000)
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N 190 mA 800 V 20 Ω 4V 2V -20 V, +20 V SOT-223 Surface Mount 3 + Tab - Enhancement 1.8 W -
RS Stock No. 871-4956
Mfr. Part No.MDP18N50BTH
BrandMagnaChip
HK$11.936
Each (In a Tube of 5)
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N 18 A 500 V 270 mΩ 4V - -30 V, +30 V TO-220 Through Hole 3 Single Enhancement 236 W -
RS Stock No. 541-0020
Mfr. Part No.IRF740PBF
BrandVishay
HK$11.99
Each
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N 10 A 400 V 550 mΩ - 2V -20 V, +20 V TO-220AB Through Hole 3 Single Enhancement 125 W -
RS Stock No. 891-2914
Mfr. Part No.TK17A65W,S5X(M
BrandToshiba
HK$11.612
Each (In a Pack of 5)
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N 17 A 650 V 200 mΩ 3.5V - -30 V, +30 V TO-220SIS Through Hole 3 Single Enhancement 45 W -
RS Stock No. 541-1269
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BrandInfineon
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N 33 A 100 V 52 mΩ 4V 2V -20 V, +20 V TO-247AC Through Hole 3 Single Enhancement 140 W -
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BrandToshiba
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N 30 mA 12.5 V - 1.5V - -8 V, +8 V USQ Surface Mount 4 Single Depletion 100 mW -
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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 -
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BrandToshiba
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