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 Maximum Gate Threshold Voltage Mounting Type Minimum Gate Threshold Voltage Pin Count Maximum Gate Source Voltage Channel Mode Maximum Power Dissipation Transistor Configuration Number of Elements per Chip
RS Stock No. 919-4781
Mfr. Part No.IRFR024NPBF
BrandInfineon
€0.705
Each (In a Tube of 75)
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N 17 A 55 V 75 mΩ DPAK (TO-252) 4V Surface Mount 2V 3 -20 V, +20 V Enhancement 45 W Single 1
RS Stock No. 827-4029
Mfr. Part No.IRFR024NTRPBF
BrandInfineon
€0.553
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N 17 A 55 V 75 mΩ DPAK (TO-252) 4V Surface Mount 2V 3 -20 V, +20 V Enhancement 45 W Single 1
RS Stock No. 541-1629
Mfr. Part No.IRFU210PBF
BrandVishay
€0.78
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N 2.6 A 200 V 1.5 Ω IPAK (TO-251) - Through Hole 2V 3 -20 V, +20 V Enhancement 2.5 W Single 1
RS Stock No. 125-0562
Mfr. Part No.TK30E06N1,S1X(S
BrandToshiba
€0.456
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N 43 A 60 V 15 mΩ TO-220 4V Through Hole 2V 3 -20 V, +20 V Enhancement 53 W - 1
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BrandInfineon
€1.284
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RS Stock No. 178-0821
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BrandVishay
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N 9.2 A 600 V 750 mΩ TO-220AB - Through Hole 2V 3 -30 V, +30 V Enhancement 170 W Single 1
RS Stock No. 166-0052
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BrandNexperia
€0.043
Each (On a Reel of 3000)
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N 320 mA 60 V 1.6 Ω SOT-323 (SC-70) 1.5V Surface Mount 0.9V 3 -20 V, +20 V Enhancement 310 mW Single 1
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BrandToshiba
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N 5 A 60 V 100 mΩ PW Mold2 2.5V Through Hole - 3 -20 V, +20 V Enhancement 20 W Single 1
RS Stock No. 919-4794
Mfr. Part No.IRF540NPBF
BrandInfineon
€0.744
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N 33 A 100 V 44 mΩ TO-220AB 4V Through Hole 2V 3 -20 V, +20 V Enhancement 130 W Single 1
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BrandVishay
€1.836
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N 3.6 A 600 V 2.2 Ω TO-220AB - Through Hole 2V 3 -30 V, +30 V Enhancement 74 W Single 1
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P 4.9 A 30 V 75 mΩ SOT-23 - Surface Mount 1V 6 -25 V, +25 V Enhancement 1.6 W Single 1
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BrandNexperia
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N 320 mA 60 V 1.6 Ω SOT-323 (SC-70) 1.5V Surface Mount 0.9V 3 -20 V, +20 V Enhancement 310 mW Single 1
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P 4.9 A 30 V 75 mΩ SOT-23 - Surface Mount 1V 6 -25 V, +25 V Enhancement 1.6 W Single 1
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P 5.5 A 20 V 60 mΩ SOT-23 - Surface Mount 0.4V 6 -8 V, +8 V Enhancement 1.6 W Single 1
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BrandMagnaChip
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N 11 A 660 V 550 mΩ TO-220F 5V Through Hole - 3 -30 V, +30 V Enhancement 49 W Single 1
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