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. 708-2469
Mfr. Part No.ZXMP4A16GTA
$1.10
Each (In a Pack of 10)
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P 6.4 A 40 V 100 mΩ - 1V -20 V, +20 V SOT-223 Surface Mount 3 + Tab Single Enhancement 3.9 W -
RS Stock No. 922-8011
Mfr. Part No.ZXMP4A16GTA
$0.567
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P 6.4 A 40 V 100 mΩ - 1V -20 V, +20 V SOT-223 Surface Mount 3 + Tab Single Enhancement 3.9 W -
RS Stock No. 827-0490
Mfr. Part No.DMP3085LSD-13
$0.249
Each (In a Pack of 50)
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P 3.1 A 30 V 95 mΩ 3V - -20 V, +20 V SOIC Surface Mount 8 Isolated Enhancement 1.7 W -
RS Stock No. 122-3314
Mfr. Part No.DMP3085LSD-13
$0.12
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P 3.1 A 30 V 95 mΩ 3V - -20 V, +20 V SOIC Surface Mount 8 Isolated Enhancement 1.7 W -
RS Stock No. 823-3198
Mfr. Part No.DMC3025LSD-13
$0.267
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N, P 2.3 A, 8.5 A 30 V 32 mΩ, 85 mΩ 2V - -20 V, +20 V SOIC Surface Mount 8 Isolated Enhancement 1.5 W -
RS Stock No. 169-7461
Mfr. Part No.DMC3025LSD-13
$0.303
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N, P 2.3 A, 8.5 A 30 V 32 mΩ, 85 mΩ 2V - -20 V, +20 V SOIC Surface Mount 8 Isolated Enhancement 1.5 W -
RS Stock No. 122-0219
Mfr. Part No.DMN3150L-7
$0.134
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N 3.8 A 30 V 112 mΩ 1.4V - -12 V, +12 V SOT-23 Surface Mount 3 Single Enhancement 1.4 W -
RS Stock No. 751-4161
Mfr. Part No.DMN3024LK3-13
$0.267
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N 14.4 A 30 V 39 mΩ 3V - -20 V, +20 V DPAK (TO-252) Surface Mount 3 Single Enhancement 8.9 W -
RS Stock No. 751-4177
Mfr. Part No.DMN3150L-7
$0.213
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N 3.8 A 30 V 112 mΩ 1.4V - -12 V, +12 V SOT-23 Surface Mount 3 Single Enhancement 1.4 W -
RS Stock No. 122-0217
Mfr. Part No.DMN3024LK3-13
$0.274
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N 14.4 A 30 V 39 mΩ 3V - -20 V, +20 V DPAK (TO-252) Surface Mount 3 Single Enhancement 8.9 W -
RS Stock No. 708-2396
Mfr. Part No.2N7002-7-F
$0.092
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N 115 mA 60 V 13.5 Ω 2.5V - -20 V, +20 V SOT-23 Surface Mount 3 Single Enhancement 300 mW -
RS Stock No. 738-4932
Mfr. Part No.BSS84-7-F
$0.105
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P 130 mA 50 V 10 Ω 2V - -20 V, +20 V SOT-23 Surface Mount 3 Single Enhancement 300 mW -
RS Stock No. 823-1823
Mfr. Part No.ZVN4206AV
$0.897
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N 600 mA 60 V 1.5 Ω 3V - -20 V, +20 V TO-92 Through Hole 3 Single Enhancement 700 mW -
RS Stock No. 823-4059
Mfr. Part No.ZXMC4559DN8TA
$1.124
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N, P 2.6 A, 4.7 A 60 V 75 mΩ, 125 mΩ - 1V -20 V, +20 V SOIC Surface Mount 8 Isolated Enhancement 2.1 W -
RS Stock No. 922-8131
Mfr. Part No.BSS84-7-F
$0.036
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P 130 mA 50 V 10 Ω 2V - -20 V, +20 V SOT-23 Surface Mount 3 Single Enhancement 300 mW -
RS Stock No. 122-2416
Mfr. Part No.ZVN4206AV
$0.544
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N 600 mA 60 V 1.5 Ω 3V - -20 V, +20 V TO-92 Through Hole 3 Single Enhancement 700 mW -
RS Stock No. 122-3286
Mfr. Part No.ZXMC4559DN8TA
$0.451
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N, P 2.6 A, 4.7 A 60 V 75 mΩ, 125 mΩ - 1V -20 V, +20 V SOIC Surface Mount 8 Isolated Enhancement 2.1 W -
RS Stock No. 827-0452
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$0.131
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P 3.3 A 20 V 200 mΩ 0.9V - -8 V, +8 V SOT-23 Surface Mount 3 Single Enhancement 1.4 W -
RS Stock No. 790-4609
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N 20 A 60 V 50 mΩ 3V - -20 V, +20 V DPAK (TO-252) Surface Mount 3 Single Enhancement 42 W -
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P 4.2 A 20 V 113 mΩ 0.9V - -8 V, +8 V SOT-23 Surface Mount 3 Single Enhancement 1.4 W -