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. 708-2393
Mfr. Part No.MMBF170-7-F
TWD8.60
Each (In a Pack of 50)
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N 500 mA 60 V 5.3 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 3V - 300 mW Single 1
RS Stock No. 122-0587
Mfr. Part No.MMBF170-7-F
TWD2.00
Each (On a Reel of 3000)
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N 500 mA 60 V 5.3 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 3V - 300 mW Single 1
RS Stock No. 122-2891
Mfr. Part No.DMP3160L-7
TWD4.80
Each (On a Reel of 3000)
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P 2 A 30 V 190 mΩ SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 2.1V - 1.08 W Single 1
RS Stock No. 827-0503
Mfr. Part No.DMP3099L-7
TWD3.20
Each (In a Pack of 100)
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P 2.9 A 30 V 99 mΩ SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 2.1V - 1.08 W Single 1
RS Stock No. 121-9641
Mfr. Part No.DMP3099L-7
TWD1.90
Each (On a Reel of 3000)
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P 2.9 A 30 V 99 mΩ SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 2.1V - 1.08 W Single 1
RS Stock No. 822-2539
Mfr. Part No.DMG2307L-7
TWD4.60
Each (In a Pack of 100)
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P 2 A 30 V 134 mΩ SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 3V - 1.9 W Single 1
RS Stock No. 822-2649
Mfr. Part No.DMP3160L-7
TWD13.70
Each (In a Pack of 50)
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P 2 A 30 V 190 mΩ SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 2.1V - 1.08 W Single 1
RS Stock No. 121-9599
Mfr. Part No.DMG2307L-7
TWD3.00
Each (On a Reel of 3000)
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P 2 A 30 V 134 mΩ SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 3V - 1.9 W Single 1
RS Stock No. 790-4583
Mfr. Part No.DMN1150UFB-7B
TWD9.50
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N 1.4 A 12 V 210 mΩ X1-DFN1006 Surface Mount 3 -6 V, +6 V Enhancement 1V - 500 mW Single 1
RS Stock No. 738-4939
Mfr. Part No.BSS138-7-F
TWD3.50
Each (In a Pack of 100)
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N 200 mA 50 V 3.5 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 1.5V - 300 mW Single 1
RS Stock No. 169-7186
Mfr. Part No.DMN1150UFB-7B
TWD2.10
Each (On a Reel of 10000)
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N 1.4 A 12 V 210 mΩ X1-DFN1006 Surface Mount 3 -6 V, +6 V Enhancement 1V - 500 mW Single 1
RS Stock No. 922-8140
Mfr. Part No.BSS138-7-F
TWD1.90
Each (On a Reel of 3000)
units
N 200 mA 50 V 3.5 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 1.5V - 300 mW Single 1
RS Stock No. 822-2532
Mfr. Part No.DMG6602SVT-7
TWD4.10
Each (In a Pack of 100)
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N, P 2.1 A, 3.4 A 30 V 100 mΩ, 140 mΩ TSOT-26 Surface Mount 6 -20 V, +20 V Enhancement 3V - 1.27 W Isolated 2
RS Stock No. 121-9587
Mfr. Part No.BSN20-7
TWD1.90
Each (On a Reel of 3000)
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N 500 mA 50 V 2 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 1.5V - 920 mW Single 1
RS Stock No. 922-7936
Mfr. Part No.ZXMP10A13FTA
TWD6.40
Each (On a Reel of 3000)
units
P 700 mA 100 V 1 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 4V - 806 mW Single 1
RS Stock No. 121-9598
Mfr. Part No.DMG6602SVT-7
TWD2.70
Each (On a Reel of 3000)
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N, P 2.1 A, 3.4 A 30 V 100 mΩ, 140 mΩ TSOT-26 Surface Mount 6 -20 V, +20 V Enhancement 3V - 1.27 W Isolated 2
RS Stock No. 669-7616
Mfr. Part No.ZXMP10A13FTA
TWD15.90
Each (In a Pack of 25)
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P 700 mA 100 V 1 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 4V - 806 mW Single 1
RS Stock No. 822-2179
Mfr. Part No.BSN20-7
TWD3.50
Each (In a Pack of 100)
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N 500 mA 50 V 2 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 1.5V - 920 mW Single 1
RS Stock No. 121-9622
Mfr. Part No.DMN65D8L-7
TWD0.90
Each (On a Reel of 3000)
units
N 310 mA 60 V 4 Ω SOT-23 Surface Mount 3 -20 V, +20 V Enhancement 2V - 540 mW Single 1
RS Stock No. 822-2508
Mfr. Part No.DMC2038LVT-7
TWD9.70
Each (In a Pack of 50)
units
N, P 2.1 A, 5.2 A 20 V 56 mΩ, 168 mΩ TSOT-26 Surface Mount 6 -12 V, +12 V Enhancement 1V - 1.1 W Isolated 2