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. 541-1736
Mfr. Part No.IRF5305PBF
BrandInfineon
$1.67
Each
units
P 31 A 55 V 60 mΩ 4V 2V -20 V, +20 V TO-220AB Through Hole 3 Single Enhancement 110 W -
RS Stock No. 919-4924
Mfr. Part No.IRF5305PBF
BrandInfineon
$1.456
Each (In a Tube of 50)
units
P 31 A 55 V 60 mΩ 4V 2V -20 V, +20 V TO-220AB Through Hole 3 Single Enhancement 110 W -
RS Stock No. 103-8043
Mfr. Part No.BUK9608-55A,118
BrandNexperia
$2.424
Each (On a Reel of 800)
units
N 75 A 55 V 8 mΩ 2V 1V -10 V, +10 V D2PAK (TO-263) Surface Mount 3 Single Enhancement 18.7 W -
RS Stock No. 653-1746
Mfr. Part No.BUK9608-55A,118
BrandNexperia
$2.09
Each
units
N 75 A 55 V 8 mΩ 2V 1V -10 V, +10 V D2PAK (TO-263) Surface Mount 3 Single Enhancement 18.7 W -
RS Stock No. 650-4491
Mfr. Part No.IRLR2905ZPBF
BrandInfineon
$1.564
Each (In a Pack of 5)
units
N 60 A 55 V 14 mΩ 2V 1V -16 V, +16 V DPAK (TO-252) Surface Mount 3 Single Enhancement 110 W -
RS Stock No. 913-3950
Mfr. Part No.IRLR2905ZPBF
BrandInfineon
$1.069
Each (In a Tube of 75)
units
N 60 A 55 V 14 mΩ 2V 1V -16 V, +16 V DPAK (TO-252) Surface Mount 3 Single Enhancement 110 W -
RS Stock No. 915-5095
Mfr. Part No.IRLR2905ZTRPBF
BrandInfineon
$1.32
Each (In a Pack of 20)
units
N 60 A 55 V 13.5 mΩ 3V 1V -16 V, +16 V DPAK (TO-252) Surface Mount 3 Single Enhancement 110 W -
RS Stock No. 168-8971
Mfr. Part No.IRLR2905ZTRPBF
BrandInfineon
$0.756
Each (On a Reel of 2000)
units
N 60 A 55 V 13.5 mΩ 3V 1V -16 V, +16 V DPAK (TO-252) Surface Mount 3 Single Enhancement 110 W -
RS Stock No. 787-9140
Mfr. Part No.IRFP460BPBF
BrandVishay
$7.37
Each
units
N 20 A 500 V 250 mΩ - 2V -20 V, +20 V TO-247AC Through Hole 3 Single Enhancement 278 W -
RS Stock No. 159-6516
Mfr. Part No.IRFP460BPBF
BrandVishay
$3.121
Each (In a Tube of 25)
units
N 20 A 500 V 250 mΩ - 2V -20 V, +20 V TO-247AC Through Hole 3 Single Enhancement 278 W -
RS Stock No. 920-8773
Mfr. Part No.STP36NF06L
$0.911
Each (In a Tube of 50)
units
N 30 A 60 V 40 mΩ 2.5V 1V -18 V, +18 V TO-220 Through Hole 3 Single Enhancement 70 W -
RS Stock No. 486-5671
Mfr. Part No.STP36NF06L
$2.50
Each (In a Pack of 5)
units
N 30 A 60 V 40 mΩ 2.5V 1V -18 V, +18 V TO-220 Through Hole 3 Single Enhancement 70 W -
RS Stock No. 919-0039
Mfr. Part No.IRF9540PBF
BrandVishay
$1.369
Each (In a Tube of 50)
units
P 19 A 100 V 200 mΩ - 2V -20 V, +20 V TO-220AB Through Hole 3 Single Enhancement 150 W -
RS Stock No. 708-5152
Mfr. Part No.IRF9540PBF
BrandVishay
$3.352
Each (In a Pack of 5)
units
P 19 A 100 V 200 mΩ - 2V -20 V, +20 V TO-220AB Through Hole 3 Single Enhancement 150 W -
RS Stock No. 178-0835
Mfr. Part No.IRF840APBF
BrandVishay
$2.222
Each (In a Tube of 50)
units
- - - - - - - - - - - - - -
RS Stock No. 542-9440
Mfr. Part No.IRF840APBF
BrandVishay
$3.06
Each
units
N 8 A 500 V 850 mΩ - 2V -30 V, +30 V TO-220AB Through Hole 3 Single Enhancement 125 W -
RS Stock No. 541-0828
Mfr. Part No.IRF9530NPBF
BrandInfineon
$2.90
Each
units
P 14 A 100 V 200 mΩ 4V 2V -20 V, +20 V TO-220AB Through Hole 3 Single Enhancement 79 W -
RS Stock No. 919-4860
Mfr. Part No.IRF9530NPBF
BrandInfineon
$1.243
Each (In a Tube of 50)
units
P 14 A 100 V 200 mΩ 4V 2V -20 V, +20 V TO-220AB Through Hole 3 Single Enhancement 79 W -
RS Stock No. 761-0590
Mfr. Part No.STQ3N45K3-AP
$1.268
Each (In a Pack of 5)
units
N 600 mA 450 V 3.8 Ω 4.5V 3V -30 V, +30 V TO-92 Through Hole 3 Single Enhancement 2.5 W -
RS Stock No. 671-0324
Mfr. Part No.BSS138
$0.449
Each (In a Pack of 10)
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N 220 mA 50 V 3.5 Ω 1.5V 0.8V -20 V, +20 V SOT-23 Surface Mount 3 Single Enhancement 360 mW -
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