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. 787-7526
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BrandPanasonic
PHP10.791
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P 4 A 12 V 30 mΩ Smini3-G1-B Surface Mount 3 -8 V, +8 V Enhancement 1V - 500 mW Single 1
RS Stock No. 787-7642
Mfr. Part No.SK8603160L
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N 70 A 30 V 3.3 mΩ HSO8-F4-B Surface Mount 8 -20 V, +20 V Enhancement 3V - 28 W Single 1
RS Stock No. 169-8019
Mfr. Part No.MTM231102LBF
BrandPanasonic
PHP5.697
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P 4 A 12 V 30 mΩ Smini3-G1-B Surface Mount 3 -8 V, +8 V Enhancement 1V - 500 mW Single 1
RS Stock No. 169-7838
Mfr. Part No.MTM761110LBF
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P 4 A 12 V 54 mΩ WSMini6-F1-B Surface Mount 6 -8 V, +8 V Enhancement 1V - 700 mW Single 1
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Mfr. Part No.SK8603160L
BrandPanasonic
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N 70 A 30 V 3.3 mΩ HSO8-F4-B Surface Mount 8 -20 V, +20 V Enhancement 3V - 28 W Single 1
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Mfr. Part No.MTM761110LBF
BrandPanasonic
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P 4 A 12 V 54 mΩ WSMini6-F1-B Surface Mount 6 -8 V, +8 V Enhancement 1V - 700 mW Single 1
RS Stock No. 169-7865
Mfr. Part No.MTM232270LBF
BrandPanasonic
PHP4.62
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Mfr. Part No.MTM232270LBF
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N 2 A 20 V 110 mΩ SMini3-G1-B Surface Mount 3 -10 V, +10 V Enhancement 1.3V - 500 mW Single 1
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Mfr. Part No.FG6943010R
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N, P 100 mA 30 V 6 Ω, 17 Ω SSMini6 F3 B Surface Mount 6 -20 V, +20 V Enhancement 1.5V - 125 mW Isolated 2
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N 100 mA 60 V 15 Ω SSMini6 F3 B Surface Mount 6 -20 V, +20 V Enhancement 1.5V - 125 mW Isolated 2
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