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. 671-4736
Mfr. Part No.BS170
£0.245
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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. 124-1745
Mfr. Part No.BS170
£0.078
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. 124-1310
Mfr. Part No.2N7000TA
£0.059
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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. 671-4733
Mfr. Part No.2N7000
£0.216
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. 169-8553
Mfr. Part No.2N7000
£0.069
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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. 739-0224
Mfr. Part No.2N7000TA
£0.225
Each (In a Pack of 10)
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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
£0.098
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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. 919-4898
Mfr. Part No.IRLZ34NPBF
BrandInfineon
£0.735
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N 30 A 55 V 35 mΩ TO-220AB Through Hole 3 -16 V, +16 V Enhancement 2V 1V 68 W Single 1
RS Stock No. 541-1247
Mfr. Part No.IRLZ34NPBF
BrandInfineon
£1.98
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N 30 A 55 V 35 mΩ TO-220AB Through Hole 3 -16 V, +16 V Enhancement 2V 1V 68 W Single 1
RS Stock No. 919-4876
Mfr. Part No.IRF520NPBF
BrandInfineon
£0.627
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N 9.7 A 100 V 200 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 4V 2V 48 W Single 1
RS Stock No. 541-1180
Mfr. Part No.IRF520NPBF
BrandInfineon
£1.98
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N 9.7 A 100 V 200 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 4V 2V 48 W Single 1
RS Stock No. 671-0324
Mfr. Part No.BSS138
£0.173
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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
£0.029
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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. 103-8398
Mfr. Part No.2N7002,215
BrandNexperia
£0.029
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N 300 mA 60 V 5 Ω SOT-23 (TO-236AB) Surface Mount 3 -30 V, +30 V Enhancement 2.5V 1V 830 mW Single 1
RS Stock No. 436-7379
Mfr. Part No.2N7002,215
BrandNexperia
£0.118
Each (In a Pack of 25)
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N 300 mA 60 V 5 Ω SOT-23 (TO-236AB) Surface Mount 3 -30 V, +30 V Enhancement 2.5V 1V 830 mW Single 1
RS Stock No. 295-703
Mfr. Part No.RFP12N10L
£2.00
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N 12 A 100 V 200 mΩ TO-220AB Through Hole 3 -10 V, +10 V Enhancement - 1V 60 W Single 1
RS Stock No. 368-3197
Mfr. Part No.RFP12N10L
£0.676
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N 12 A 100 V 200 mΩ TO-220AB Through Hole 3 -10 V, +10 V Enhancement - 1V 60 W Single 1
RS Stock No. 688-7204
Mfr. Part No.IRLB3034PBF
BrandInfineon
£2.085
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N 343 A 40 V 2 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 2.5V 1V 375 W Single 1
RS Stock No. 124-9024
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BrandInfineon
£1.774
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N 343 A 40 V 2 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 2.5V 1V 375 W Single 1
RS Stock No. 807-5863
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