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, TO-220 and SOIC.

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 Category Maximum Power Dissipation
RS Stock No. 122-0587
Mfr. Part No.MMBF170-7-F
TWD2
Each (On a Reel of 3000)
units
N 500 mA 60 V 5.3 Ω 3V - -20 V, +20 V SOT-23 Surface Mount 3 Single Enhancement Small Signal 300 mW
RS Stock No. 708-2393
Mfr. Part No.MMBF170-7-F
TWD5
Each (In a Pack of 50)
units
N 500 mA 60 V 5.3 Ω 3V - -20 V, +20 V SOT-23 Surface Mount 3 Single Enhancement Small Signal 300 mW
RS Stock No. 897-7179
Mfr. Part No.SPW21N50C3FKSA1
BrandInfineon
TWD92
Each (In a Pack of 4)
units
N 21 A 560 V 190 mΩ 3.9V 2.1V -30 V, +30 V TO-247 Through Hole 3 Single Enhancement Power MOSFET 208 W
RS Stock No. 145-8724
Mfr. Part No.SPW21N50C3FKSA1
BrandInfineon
TWD85
Each (In a Tube of 30)
units
N 21 A 560 V 190 mΩ 3.9V 2.1V -30 V, +30 V TO-247 Through Hole 3 Single Enhancement Power MOSFET 208 W
RS Stock No. 787-9140
Mfr. Part No.IRFP460BPBF
BrandVishay
TWD141
Each
units
N 20 A 500 V 250 mΩ - 2V -20 V, +20 V TO-247AC Through Hole 3 Single Enhancement Power MOSFET 278 W
RS Stock No. 159-6516
Mfr. Part No.IRFP460BPBF
BrandVishay
TWD55
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 Power MOSFET 278 W
RS Stock No. 169-8553
Mfr. Part No.2N7000
TWD2
Each (On a Reel of 10000)
units
N 200 mA 60 V 5 Ω - 0.8V -20 V, +20 V TO-92 Through Hole 3 Single Enhancement Small Signal 400 mW
RS Stock No. 124-1310
Mfr. Part No.2N7000TA
TWD2
Each (On a Reel of 2000)
units
N 200 mA 60 V 5 Ω - 0.3V -30 V, +30 V TO-92 Through Hole 3 Single Enhancement Small Signal 400 mW
RS Stock No. 739-0224
Mfr. Part No.2N7000TA
TWD7
Each (In a Pack of 10)
units
N 200 mA 60 V 5 Ω - 0.3V -30 V, +30 V TO-92 Through Hole 3 Single Enhancement Small Signal 400 mW
RS Stock No. 903-4074
Mfr. Part No.2N7000-D26Z
TWD5
Each (In a Pack of 100)
units
N 200 mA 60 V 9 Ω - 0.8V -40 V, +40 V TO-92 Through Hole 3 Single Enhancement Power MOSFET 400 mW
RS Stock No. 671-4733
Mfr. Part No.2N7000
TWD9
Each (In a Pack of 20)
units
N 200 mA 60 V 5 Ω - 0.8V -20 V, +20 V TO-92 Through Hole 3 Single Enhancement Small Signal 400 mW
RS Stock No. 166-3296
Mfr. Part No.FDPF770N15A
TWD32
Each (In a Tube of 50)
units
N 10 A 150 V 77 mΩ - 2V -20 V, +20 V TO-220F Through Hole 3 Single Enhancement Power MOSFET 21 W
RS Stock No. 864-8625
Mfr. Part No.FDPF770N15A
TWD34
Each (In a Pack of 10)
units
N 10 A 150 V 77 mΩ - 2V -20 V, +20 V TO-220F Through Hole 3 Single Enhancement Power MOSFET 21 W
RS Stock No. 738-7663
Mfr. Part No.D1008UK
BrandSemelab
TWD3,898
Each
units
N 10 A 70 V - 7V - -20 V, +20 V DK Panel Mount 5 Common Source Enhancement RF MOSFET 175 W
RS Stock No. 124-9056
Mfr. Part No.IRFS7530TRL7PP
BrandInfineon
TWD60
Each (On a Reel of 800)
units
N 240 A 60 V 1.4 mΩ 3.7V 2.1V -20 V, +20 V D2PAK (TO-263) Surface Mount 7 Single Enhancement Power MOSFET 375 W
RS Stock No. 541-0862
Mfr. Part No.IRFP9240PBF
BrandVishay
TWD91
Each
units
P 12 A 200 V 500 mΩ - 2V -20 V, +20 V TO-247AC Through Hole 3 Single Enhancement Power MOSFET 150 W
RS Stock No. 170-4341
Mfr. Part No.DN2540N3-G
BrandMicrochip
TWD25
Each (In a Bag of 1000)
units
- - - - - - - - - - - - - -
RS Stock No. 829-3235
Mfr. Part No.DN2540N3-G
BrandMicrochip
TWD24
Each (In a Pack of 10)
units
N 120 mA 400 V 25 Ω 3.5V - -20 V, +20 V TO-92 Through Hole 3 Single Depletion - 1 W
RS Stock No. 759-9715
Mfr. Part No.FDT86113LZ
TWD21
Each (In a Pack of 5)
units
N 3.3 A 100 V 189 mΩ - 1V -20 V, +20 V SOT-223 Surface Mount 3+Tab Single Enhancement Power MOSFET 2.2 W
RS Stock No. 792-0894
Mfr. Part No.BSS138BK,215
BrandNexperia
TWD2
Each (On a Reel of 50)
units
N 360 mA 60 V 1.6 Ω 1.6V 0.48V -20 V, +20 V SOT-23 Surface Mount 3 Single Enhancement - 420 mW