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. 798-3003
Mfr. Part No.PSMN5R6-100PS,127
BrandNexperia
HK$17.19
Each (In a Pack of 2)
units
N 100 A 100 V 5.6 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement 4V 2V 306 W Single 1
RS Stock No. 168-7961
Mfr. Part No.TK17A65W,S5X(M
BrandToshiba
HK$22.199
Each (In a Tube of 50)
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N 17 A 650 V 200 mΩ TO-220SIS Through Hole 3 -30 V, +30 V Enhancement 3.5V - 45 W Single 1
RS Stock No. 178-0833
Mfr. Part No.IRF820APBF
BrandVishay
HK$11.74
Each (In a Tube of 50)
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- - - - - - - - - - - - - -
RS Stock No. 145-5453
Mfr. Part No.FQPF9P25
HK$10.486
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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
RS Stock No. 911-4861
Mfr. Part No.BSP300H6327XUSA1
BrandInfineon
HK$4.50
Each (On a Reel of 1000)
units
N 190 mA 800 V 20 Ω SOT-223 Surface Mount 3 + Tab -20 V, +20 V Enhancement 4V 2V 1.8 W - 1
RS Stock No. 761-0499
Mfr. Part No.STF9NK90Z
HK$32.46
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N 8 A 900 V 1.3 Ω TO-220FP Through Hole 3 -30 V, +30 V Enhancement 4.5V 3V 40 W Single 1
RS Stock No. 756-0382
Mfr. Part No.3SK294(TE85L,F)
BrandToshiba
HK$2.793
Each (In a Pack of 10)
units
N 30 mA 12.5 V - USQ Surface Mount 4 -8 V, +8 V Depletion 1.5V - 100 mW Single 1
RS Stock No. 121-9547
Mfr. Part No.DMP2305U-7
HK$0.578
Each (On a Reel of 3000)
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P 4.2 A 20 V 113 mΩ SOT-23 Surface Mount 3 -8 V, +8 V Enhancement 0.9V - 1.4 W Single 1
RS Stock No. 165-8287
Mfr. Part No.IRFR8314TRPBF
BrandInfineon
HK$4.60
Each (On a Reel of 2000)
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N 179 A 30 V 3.1 mΩ DPAK (TO-252) Surface Mount 3 -20 V, +20 V Enhancement 2.2V 1.2V 125 W Single 1
RS Stock No. 915-5027
Mfr. Part No.IRFR8314TRPBF
BrandInfineon
HK$9.477
Each (In a Pack of 10)
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N 179 A 30 V 3.1 mΩ DPAK (TO-252) Surface Mount 3 -20 V, +20 V Enhancement 2.2V 1.2V 125 W Single 1
RS Stock No. 919-4876
Mfr. Part No.IRF520NPBF
BrandInfineon
HK$6.987
Each (In a Tube of 50)
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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. 168-6215
Mfr. Part No.STP4NK60ZFP
HK$11.407
Each (In a Tube of 50)
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N 4 A 600 V 2 Ω TO-220FP Through Hole 3 -30 V, +30 V Enhancement 4.5V 3V 25 W Single 1
RS Stock No. 485-7888
Mfr. Part No.STP80NF10
HK$25.09
Each
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N 80 A 100 V 15 mΩ TO-220 Through Hole 3 -20 V, +20 V Enhancement 4V 2V 300 W Single 1
RS Stock No. 753-3037
Mfr. Part No.IPP100N10S305AKSA1
BrandInfineon
HK$25.91
Each
units
N 100 A 100 V 5.1 mΩ TO-220 Through Hole 3 -20 V, +20 V Enhancement 4V 2V 300 W Single 1
RS Stock No. 919-4808
Mfr. Part No.IRFP064NPBF
BrandInfineon
HK$18.454
Each (In a Tube of 25)
units
N 110 A 55 V 8 mΩ TO-247AC Through Hole 3 -20 V, +20 V Enhancement 4V 2V 200 W Single 1
RS Stock No. 790-5283
Mfr. Part No.NTR4003NT1G
HK$0.583
Each (In a Pack of 100)
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N 560 mA 30 V 2 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 1.4V - 690 mW Single 1
RS Stock No. 841-312
Mfr. Part No.RFP70N06
HK$14.85
Each
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N 70 A 60 V 14 mΩ TO-220AB Through Hole 3 -20 V, +20 V Enhancement - 2V 150 W Single 1
RS Stock No. 826-9260
Mfr. Part No.BSP296NH6327XTSA1
BrandInfineon
HK$4.336
Each (In a Pack of 50)
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N 1.2 A 100 V 800 mΩ SOT-223 Surface Mount 3 + Tab -20 V, +20 V Enhancement 1.8V 0.8V 1.8 W Single 1
RS Stock No. 920-6658
Mfr. Part No.STP80NF10
HK$20.884
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N 80 A 100 V 15 mΩ TO-220 Through Hole 3 -20 V, +20 V Enhancement 4V 2V 300 W Single 1
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