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. For more information about MOSFETs, please see our complete guide to MOSFETs.

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 like 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 like standard MOSFETs but they are designed to handle a higher level of power.

N-Channel vs. P-Channel MOSFETs

N-Channel MOSFETs contain additional electrons which are free to move around. They are a 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.


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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. 121-9764
Mfr. Part No.CSD19536KCS
HK$36.656
Each (In a Tube of 50)
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N 259 A 100 V 3.2 mΩ TO-220 Through Hole 3 -20 V, +20 V Enhancement 3.2V 2.1V 375 W Single 1
RS Stock No. 827-4919
Mfr. Part No.CSD19536KCS
HK$46.18
Each (In a Pack of 2)
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N 259 A 100 V 3.2 mΩ TO-220 Through Hole 3 -20 V, +20 V Enhancement 3.2V 2.1V 375 W Single 1
RS Stock No. 168-4377
Mfr. Part No.CSD18563Q5A
HK$6.586
Each (On a Reel of 2500)
units
N 100 A 60 V 10.8 mΩ VSON-FET Surface Mount 8 -20 V, +20 V Enhancement 2.4V 1.7V 3.2 W Single 1
RS Stock No. 827-4874
Mfr. Part No.CSD18503Q5A
HK$13.84
Each (In a Pack of 5)
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N 145 A 40 V 6.2 mΩ SON Surface Mount 8 -20 V, +20 V Enhancement 2.3V 1.5V 3.1 W Single 1
RS Stock No. 823-9240
Mfr. Part No.CSD17381F4T
HK$2.688
Each (In a Pack of 20)
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N 3.1 A 30 V 250 mΩ PICOSTAR Surface Mount 3 -12 V, +12 V Enhancement 1.1V 0.65V 500 mW Single 1
RS Stock No. 827-4883
Mfr. Part No.CSD18504Q5A
HK$9.074
Each (In a Pack of 5)
units
N 75 A 40 V 9.8 mΩ SON Surface Mount 8 -20 V, +20 V Enhancement 2.4V 1.5V 3.1 W Single 1
RS Stock No. 145-1158
Mfr. Part No.CSD17484F4T
HK$1.432
Each (On a Reel of 250)
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N 3 A 30 V 270 mΩ PICOSTAR Surface Mount 3 -12 V, +12 V Enhancement - - 500 mW Single 1
New
RS Stock No. 208-8483
Mfr. Part No.CSD19531Q5A
HK$7.828
Each (On a Reel of 2500)
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N 100 A 100 V 6400000 Ω VSONP - 8 - Enhancement 2.7V - - - 1
RS Stock No. 162-8541
Mfr. Part No.CSD17308Q3
HK$2.884
Each (On a Reel of 2500)
units
N 47 A 30 V 16.5 mΩ SON Surface Mount 8 -8 V, +10 V Enhancement 1.8V 0.9V 2.7 W Single 1
RS Stock No. 162-8145
Mfr. Part No.CSD19531Q5AT
HK$10.928
Each (On a Reel of 250)
units
N 110 A 100 V 7.8 mΩ VSON Surface Mount 8 -20 V, +20 V Enhancement 3.3V 2.2V 125 W Single 1
New
RS Stock No. 208-8492
Mfr. Part No.CSD25402Q3A
HK$6.386
Each (In a Pack of 25)
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P 76 A 20 V 8.9e+006 Ω VSONP - 8 - Enhancement 0.65V - - - 1
RS Stock No. 827-4909
Mfr. Part No.CSD18563Q5A
HK$14.638
Each (In a Pack of 5)
units
N 100 A 60 V 10.8 mΩ VSON-FET Surface Mount 8 -20 V, +20 V Enhancement 2.4V 1.7V 3.2 W Single 1
RS Stock No. 168-4938
Mfr. Part No.CSD18535KTTT
HK$26.87
Each (In a Tube of 50)
units
N 279 A 60 V 2.9 mΩ D2PAK (TO-263) Surface Mount 3 -20 V, +20 V Enhancement 2.4V 1.4V 300 W Single 1
RS Stock No. 162-9734
Mfr. Part No.CSD17573Q5BT
HK$10.135
Each (On a Reel of 250)
units
N 43 A 30 V 1.45 mΩ VSCON-CLIP Surface Mount 8 -20 V, +20 V Enhancement - - 3.2 W Single 1
New
RS Stock No. 208-8479
Mfr. Part No.CSD17575Q3
HK$4.259
Each (On a Reel of 2500)
units
N 3 A 30 V 2300000 Ω VSONP - 8 - Enhancement 1.1V - - - 1
RS Stock No. 133-0154
Mfr. Part No.CSD19502Q5BT
HK$26.325
Each (In a Pack of 2)
units
N 157 A 80 V 4.8 mΩ VSON-CLIP Surface Mount 8 -20 V, +20 V Enhancement 3.3V 2.2V 195 W Single 1
RS Stock No. 145-6334
Mfr. Part No.CSD83325LT
HK$3.654
Each (On a Reel of 250)
units
N 8 A 12 V 23 mΩ PICOSTAR Surface Mount 6 -10 V, +10 V Enhancement - - 2.3 W Single 1
RS Stock No. 827-4892
Mfr. Part No.CSD18533Q5A
HK$14.196
Each (In a Pack of 5)
units
N 100 A 60 V 8.5 mΩ SON Surface Mount 8 -20 V, +20 V Enhancement 2.3V 1.5V 3.2 W Single 1
RS Stock No. 827-4818
Mfr. Part No.CSD17301Q5A
HK$13.49
Each (In a Pack of 5)
units
N 100 A 30 V 3.7 mΩ SON Surface Mount 8 -8 V, +10 V Enhancement 1.55V 0.9V 3.2 W Single 1
RS Stock No. 162-8558
Mfr. Part No.CSD19506KCS
HK$36.656
Each (In a Tube of 50)
units
N 273 A 80 V 2.8 mΩ TO-220 Through Hole 3 -20 V, +20 V Enhancement 3.2V 2.1V 375 W Single 1