NXP Semiconductors RF Small Signal Field Effect Transistors (FET) 622

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Part RoHS Manufacturer Polarity or Channel Type Configuration Surface Mount Maximum Power Dissipation (Abs) Package Body Material Transistor Application Minimum DS Breakdown Voltage Minimum Power Gain (Gp) Terminal Form Package Shape Operating Mode No. of Elements Highest Frequency Band Maximum Drain Current (Abs) (ID) No. of Terminals Package Style (Meter) Sub-Category Field Effect Transistor Technology Maximum Power Dissipation Ambient Maximum Operating Temperature Transistor Element Material Minimum Operating Temperature Terminal Finish Maximum Drain Current (ID) Terminal Position JESD-30 Code Moisture Sensitivity Level (MSL) Case Connection Qualification Additional Features JEDEC-95 Code JESD-609 Code Maximum Time At Peak Reflow Temperature (s) Peak Reflow Temperature (C) Maximum Feedback Capacitance (Crss) Reference Standard

PMBFJ308TRL

NXP Semiconductors

N-CHANNEL

SINGLE

YES

PLASTIC/EPOXY

AMPLIFIER

25 V

GULL WING

RECTANGULAR

DEPLETION MODE

1

VERY HIGH FREQUENCY BAND

3

SMALL OUTLINE

JUNCTION

150 Cel

SILICON

TIN

DUAL

R-PDSO-G3

Not Qualified

e3

2.5 pF

PMBF5484-TAPE-7

NXP Semiconductors

N-CHANNEL

SINGLE

YES

PLASTIC/EPOXY

AMPLIFIER

25 V

GULL WING

RECTANGULAR

DEPLETION MODE

1

ULTRA HIGH FREQUENCY BAND

3

SMALL OUTLINE

JUNCTION

150 Cel

SILICON

DUAL

R-PDSO-G3

Not Qualified

LOW NOISE

1 pF

BF1118W

NXP Semiconductors

N-CHANNEL

SINGLE WITH BUILT-IN DIODE

YES

PLASTIC/EPOXY

SWITCHING

3 V

GULL WING

RECTANGULAR

DEPLETION MODE

1

ULTRA HIGH FREQUENCY BAND

4

SMALL OUTLINE

METAL-OXIDE SEMICONDUCTOR

150 Cel

SILICON

TIN

.01 A

DUAL

R-PDSO-G4

1

e3

IEC-60134

BF1100WRT/R

NXP Semiconductors

N-CHANNEL

COMPLEX

YES

PLASTIC/EPOXY

AMPLIFIER

14 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

2

ULTRA HIGH FREQUENCY BAND

4

SMALL OUTLINE

METAL-OXIDE SEMICONDUCTOR

150 Cel

SILICON

TIN

.03 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

LOW NOISE

e3

.035 pF

PMBFJ309TRL13

NXP Semiconductors

N-CHANNEL

SINGLE

YES

PLASTIC/EPOXY

AMPLIFIER

25 V

GULL WING

RECTANGULAR

DEPLETION MODE

1

VERY HIGH FREQUENCY BAND

3

SMALL OUTLINE

JUNCTION

150 Cel

SILICON

TIN

DUAL

R-PDSO-G3

1

Not Qualified

e3

30

260

2.5 pF

934002640235

NXP Semiconductors

N-CHANNEL

SINGLE WITH BUILT-IN DIODE

YES

PLASTIC/EPOXY

AMPLIFIER

12 V

GULL WING

RECTANGULAR

DUAL GATE, DEPLETION MODE

2

ULTRA HIGH FREQUENCY BAND

4

SMALL OUTLINE

METAL-OXIDE SEMICONDUCTOR

SILICON

TIN

.03 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

LOW NOISE

e3

BLF202,115

NXP Semiconductors

N-CHANNEL

SINGLE

YES

5.7 W

CERAMIC, METAL-SEALED COFIRED

AMPLIFIER

40 V

10 dB

GULL WING

RECTANGULAR

ENHANCEMENT MODE

1

VERY HIGH FREQUENCY BAND

1 A

8

SMALL OUTLINE

FET General Purpose Power

METAL-OXIDE SEMICONDUCTOR

200 Cel

SILICON

1 A

DUAL

R-CDSO-G8

Not Qualified

BF909R-T

NXP Semiconductors

N-CHANNEL

COMPLEX

YES

PLASTIC/EPOXY

AMPLIFIER

7 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

2

ULTRA HIGH FREQUENCY BAND

4

SMALL OUTLINE

METAL-OXIDE SEMICONDUCTOR

150 Cel

SILICON

.04 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

LOW NOISE

.05 pF

BF904R

NXP Semiconductors

N-CHANNEL

SINGLE WITH BUILT-IN DIODE

YES

PLASTIC/EPOXY

AMPLIFIER

7 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

1

ULTRA HIGH FREQUENCY BAND

.03 A

4

SMALL OUTLINE

FET General Purpose Power

METAL-OXIDE SEMICONDUCTOR

150 Cel

SILICON

TIN

.03 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

LOW NOISE

e3

.035 pF

934031480135

NXP Semiconductors

N-CHANNEL

COMPLEX

YES

PLASTIC/EPOXY

AMPLIFIER

7 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

2

ULTRA HIGH FREQUENCY BAND

4

SMALL OUTLINE

METAL-OXIDE SEMICONDUCTOR

SILICON

TIN

.03 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

LOW NOISE

e3

.035 pF

BF909-TAPE-13

NXP Semiconductors

N-CHANNEL

SINGLE WITH BUILT-IN DIODE

YES

PLASTIC/EPOXY

AMPLIFIER

7 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

1

ULTRA HIGH FREQUENCY BAND

4

SMALL OUTLINE

METAL-OXIDE SEMICONDUCTOR

150 Cel

SILICON

.04 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

LOW NOISE

.05 pF

BF980A

NXP Semiconductors

N-CHANNEL

SINGLE WITH BUILT-IN DIODE

YES

PLASTIC/EPOXY

AMPLIFIER

18 V

FLAT

ROUND

DUAL GATE, DEPLETION MODE

1

ULTRA HIGH FREQUENCY BAND

4

DISK BUTTON

METAL-OXIDE SEMICONDUCTOR

150 Cel

SILICON

.03 A

RADIAL

O-PRDB-F4

Not Qualified

35 pF

BF1211WR

NXP Semiconductors

N-CHANNEL

COMPLEX

YES

.18 W

PLASTIC/EPOXY

AMPLIFIER

6 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

2

ULTRA HIGH FREQUENCY BAND

.03 A

4

SMALL OUTLINE

FET General Purpose Power

METAL-OXIDE SEMICONDUCTOR

150 Cel

SILICON

TIN

.03 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

LOW NOISE

e3

30

260

.03 pF

BLM8G0710S-30PBG

NXP Semiconductors

933505270215

NXP Semiconductors

N-CHANNEL

SINGLE

YES

PLASTIC/EPOXY

AMPLIFIER

20 V

GULL WING

RECTANGULAR

DEPLETION MODE

1

VERY HIGH FREQUENCY BAND

3

SMALL OUTLINE

JUNCTION

SILICON

TIN

.03 A

DUAL

R-PDSO-G3

1

Not Qualified

LOW NOISE

e3

.5 pF

BLS73135L-350P

NXP Semiconductors

BF909WR-TAPE-13

NXP Semiconductors

N-CHANNEL

SINGLE WITH BUILT-IN DIODE

YES

PLASTIC/EPOXY

AMPLIFIER

7 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

1

ULTRA HIGH FREQUENCY BAND

4

SMALL OUTLINE

METAL-OXIDE SEMICONDUCTOR

150 Cel

SILICON

.04 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

LOW NOISE

.05 pF

BLF221B

NXP Semiconductors

N-CHANNEL

SINGLE

NO

7.4 W

METAL

AMPLIFIER

40 V

9 dB

WIRE

ROUND

ENHANCEMENT MODE

1

VERY HIGH FREQUENCY BAND

1 A

3

CYLINDRICAL

FET General Purpose Power

METAL-OXIDE SEMICONDUCTOR

7.4 W

200 Cel

SILICON

1 A

BOTTOM

O-MBCY-W3

DRAIN

Not Qualified

TO-39

BF1100WR-TAPE-13

NXP Semiconductors

N-CHANNEL

SINGLE WITH BUILT-IN DIODE

YES

PLASTIC/EPOXY

AMPLIFIER

14 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

1

ULTRA HIGH FREQUENCY BAND

4

SMALL OUTLINE

METAL-OXIDE SEMICONDUCTOR

150 Cel

SILICON

.03 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

LOW NOISE

.035 pF

BF1201WRT/R

NXP Semiconductors

N-CHANNEL

SINGLE WITH BUILT-IN DIODE

YES

PLASTIC/EPOXY

AMPLIFIER

10 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

1

ULTRA HIGH FREQUENCY BAND

4

SMALL OUTLINE

METAL-OXIDE SEMICONDUCTOR

SILICON

TIN

.03 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

LOW NOISE

e3

.03 pF

934021470215

NXP Semiconductors

N-CHANNEL

SINGLE

YES

PLASTIC/EPOXY

SWITCHING

30 V

GULL WING

RECTANGULAR

DEPLETION MODE

1

VERY HIGH FREQUENCY BAND

3

SMALL OUTLINE

JUNCTION

SILICON

TIN

DUAL

R-PDSO-G3

1

Not Qualified

TO-236AB

e3

BF909AR

NXP Semiconductors

N-CHANNEL

COMPLEX

YES

PLASTIC/EPOXY

AMPLIFIER

7 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

2

ULTRA HIGH FREQUENCY BAND

.04 A

4

SMALL OUTLINE

FET General Purpose Power

METAL-OXIDE SEMICONDUCTOR

.2 W

150 Cel

SILICON

.04 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

.05 pF

BF410A

NXP Semiconductors

N-CHANNEL

SINGLE

NO

.3 W

PLASTIC/EPOXY

AMPLIFIER

20 V

THROUGH-HOLE

ROUND

DEPLETION MODE

1

VERY HIGH FREQUENCY BAND

3

CYLINDRICAL

Other Transistors

JUNCTION

150 Cel

SILICON

.03 A

BOTTOM

O-PBCY-T3

Not Qualified

TO-92

.7 pF

BF1105R

NXP Semiconductors

N-CHANNEL

SINGLE

YES

PLASTIC/EPOXY

AMPLIFIER

7 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

1

ULTRA HIGH FREQUENCY BAND

.03 A

4

SMALL OUTLINE

FET General Purpose Power

METAL-OXIDE SEMICONDUCTOR

150 Cel

SILICON

Tin (Sn)

.03 A

DUAL

R-PDSO-G4

1

SOURCE

Not Qualified

e3

30

260

.04 pF

BF556C-TAPE-7

NXP Semiconductors

N-CHANNEL

SINGLE

YES

PLASTIC/EPOXY

AMPLIFIER

30 V

GULL WING

RECTANGULAR

DEPLETION MODE

1

VERY HIGH FREQUENCY BAND

3

SMALL OUTLINE

JUNCTION

150 Cel

SILICON

DUAL

R-PDSO-G3

Not Qualified

934055157215

NXP Semiconductors

N-CHANNEL

SINGLE

YES

PLASTIC/EPOXY

SWITCHING

3 V

GULL WING

RECTANGULAR

DEPLETION MODE

1

3

SMALL OUTLINE

METAL-OXIDE SEMICONDUCTOR

SILICON

TIN

.01 A

DUAL

R-PDSO-G3

1

Not Qualified

e3

BF245A/0

NXP Semiconductors

N-CHANNEL

SINGLE

NO

.3 W

PLASTIC/EPOXY

AMPLIFIER

30 V

THROUGH-HOLE

ROUND

DEPLETION MODE

1

VERY HIGH FREQUENCY BAND

3

CYLINDRICAL

Other Transistors

JUNCTION

150 Cel

SILICON

.025 A

BOTTOM

O-PBCY-T3

Not Qualified

TO-92

MRFG35003NT1

NXP Semiconductors

N-CHANNEL

SINGLE

YES

PLASTIC/EPOXY

AMPLIFIER

15 V

10 dB

FLAT

RECTANGULAR

DEPLETION MODE

1

S BAND

4

FLATPACK

FET RF Small Signal

HIGH ELECTRON MOBILITY

8.1 W

85 Cel

GALLIUM ARSENIDE

Matte Tin (Sn)

QUAD

R-PQFP-F4

1

SOURCE

Not Qualified

e3

40

260

BF1201R

NXP Semiconductors

N-CHANNEL

SINGLE WITH BUILT-IN DIODE

YES

.2 W

PLASTIC/EPOXY

AMPLIFIER

10 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

1

ULTRA HIGH FREQUENCY BAND

.03 A

4

SMALL OUTLINE

FET General Purpose Power

METAL-OXIDE SEMICONDUCTOR

150 Cel

SILICON

TIN

.03 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

LOW NOISE

e3

.03 pF

BF980

NXP Semiconductors

N-CHANNEL

SINGLE

YES

CERAMIC, METAL-SEALED COFIRED

18 V

FLAT

ROUND

DUAL GATE, DEPLETION MODE

1

ULTRA HIGH FREQUENCY BAND

4

DISK BUTTON

METAL-OXIDE SEMICONDUCTOR

SILICON

RADIAL

O-CRDB-F4

Not Qualified

BF904T/R

NXP Semiconductors

N-CHANNEL

SINGLE WITH BUILT-IN DIODE

YES

PLASTIC/EPOXY

AMPLIFIER

7 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

1

ULTRA HIGH FREQUENCY BAND

.03 A

4

SMALL OUTLINE

FET General Purpose Power

METAL-OXIDE SEMICONDUCTOR

150 Cel

SILICON

TIN

.03 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

LOW NOISE

e3

40

260

.035 pF

BFU310

NXP Semiconductors

N-CHANNEL

SINGLE

NO

METAL

AMPLIFIER

25 V

WIRE

ROUND

DEPLETION MODE

1

ULTRA HIGH FREQUENCY BAND

3

CYLINDRICAL

JUNCTION

150 Cel

SILICON

BOTTOM

O-MBCY-W3

GATE

Not Qualified

LOW NOISE

TO-18

2.5 pF

934063998115

NXP Semiconductors

N-CHANNEL

COMPLEX

YES

PLASTIC/EPOXY

SWITCHING

6 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

2

ULTRA HIGH FREQUENCY BAND

6

SMALL OUTLINE

METAL-OXIDE SEMICONDUCTOR

SILICON

.03 A

DUAL

R-PDSO-G6

LOW NOISE

BF1206,115

NXP Semiconductors

N-CHANNEL

COMPLEX

YES

.18 W

PLASTIC/EPOXY

AMPLIFIER

6 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

2

ULTRA HIGH FREQUENCY BAND

.03 A

6

SMALL OUTLINE

FET General Purpose Power

METAL-OXIDE SEMICONDUCTOR

150 Cel

SILICON

TIN

.03 A

DUAL

R-PDSO-G6

Not Qualified

e3

.03 pF

BLM7G1822S-80PBG

NXP Semiconductors

934036570115

NXP Semiconductors

N-CHANNEL

COMPLEX

YES

PLASTIC/EPOXY

AMPLIFIER

14 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

2

ULTRA HIGH FREQUENCY BAND

4

SMALL OUTLINE

METAL-OXIDE SEMICONDUCTOR

SILICON

TIN

.03 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

LOW NOISE

e3

.035 pF

BF901T/R

NXP Semiconductors

N-CHANNEL

SINGLE WITH BUILT-IN DIODE

YES

PLASTIC/EPOXY

AMPLIFIER

12 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

1

ULTRA HIGH FREQUENCY BAND

4

SMALL OUTLINE

METAL-OXIDE SEMICONDUCTOR

150 Cel

SILICON

.03 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

LOW NOISE

BLM7G1822S-80PB

NXP Semiconductors

PMBF4416A-T

NXP Semiconductors

N-CHANNEL

SINGLE

YES

PLASTIC/EPOXY

AMPLIFIER

35 V

GULL WING

RECTANGULAR

DEPLETION MODE

1

ULTRA HIGH FREQUENCY BAND

3

SMALL OUTLINE

JUNCTION

150 Cel

SILICON

DUAL

R-PDSO-G3

Not Qualified

LOW NOISE

.8 pF

BF901R-TAPE-13

NXP Semiconductors

N-CHANNEL

SINGLE WITH BUILT-IN DIODE

YES

PLASTIC/EPOXY

AMPLIFIER

12 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

1

ULTRA HIGH FREQUENCY BAND

4

SMALL OUTLINE

METAL-OXIDE SEMICONDUCTOR

150 Cel

SILICON

.03 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

LOW NOISE

BF904AWR

NXP Semiconductors

N-CHANNEL

COMPLEX

YES

PLASTIC/EPOXY

AMPLIFIER

7 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

2

ULTRA HIGH FREQUENCY BAND

.03 A

4

SMALL OUTLINE

FET General Purpose Power

METAL-OXIDE SEMICONDUCTOR

150 Cel

SILICON

MATTE TIN

.03 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

LOW NOISE

e3

.035 pF

BF1206

NXP Semiconductors

N-CHANNEL

COMPLEX

YES

.18 W

PLASTIC/EPOXY

AMPLIFIER

6 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

2

ULTRA HIGH FREQUENCY BAND

.03 A

6

SMALL OUTLINE

FET General Purpose Power

METAL-OXIDE SEMICONDUCTOR

150 Cel

SILICON

TIN

.03 A

DUAL

R-PDSO-G6

Not Qualified

e3

.03 pF

BF1212

NXP Semiconductors

N-CHANNEL

SINGLE WITH BUILT-IN DIODE

YES

.18 W

PLASTIC/EPOXY

AMPLIFIER

6 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

1

ULTRA HIGH FREQUENCY BAND

.03 A

4

SMALL OUTLINE

FET General Purpose Power

METAL-OXIDE SEMICONDUCTOR

150 Cel

SILICON

TIN

.03 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

LOW NOISE

e3

.03 pF

934055959215

NXP Semiconductors

N-CHANNEL

SINGLE WITH BUILT-IN DIODE

YES

PLASTIC/EPOXY

AMPLIFIER

10 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

1

ULTRA HIGH FREQUENCY BAND

4

SMALL OUTLINE

METAL-OXIDE SEMICONDUCTOR

SILICON

TIN

.03 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

LOW NOISE

e3

.03 pF

BF904RT/R

NXP Semiconductors

N-CHANNEL

SINGLE WITH BUILT-IN DIODE

YES

PLASTIC/EPOXY

AMPLIFIER

7 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

1

ULTRA HIGH FREQUENCY BAND

.03 A

4

SMALL OUTLINE

FET General Purpose Power

METAL-OXIDE SEMICONDUCTOR

150 Cel

SILICON

TIN

.03 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

LOW NOISE

e3

260

.035 pF

BF909ATRL13

NXP Semiconductors

N-CHANNEL

COMPLEX

YES

PLASTIC/EPOXY

AMPLIFIER

7 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

2

ULTRA HIGH FREQUENCY BAND

4

SMALL OUTLINE

METAL-OXIDE SEMICONDUCTOR

150 Cel

SILICON

.04 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

.05 pF

934021470235

NXP Semiconductors

N-CHANNEL

SINGLE

YES

PLASTIC/EPOXY

SWITCHING

30 V

GULL WING

RECTANGULAR

DEPLETION MODE

1

VERY HIGH FREQUENCY BAND

3

SMALL OUTLINE

JUNCTION

SILICON

TIN

DUAL

R-PDSO-G3

1

Not Qualified

TO-236AB

e3

BF1100

NXP Semiconductors

N-CHANNEL

COMPLEX

YES

PLASTIC/EPOXY

AMPLIFIER

14 V

GULL WING

RECTANGULAR

DUAL GATE, ENHANCEMENT MODE

2

ULTRA HIGH FREQUENCY BAND

.03 A

4

SMALL OUTLINE

FET General Purpose Power

METAL-OXIDE SEMICONDUCTOR

150 Cel

SILICON

MATTE TIN

.03 A

DUAL

R-PDSO-G4

SOURCE

Not Qualified

LOW NOISE

e3

40

260

.035 pF

RF Small Signal Field Effect Transistors (FET)

RF Small Signal Bipolar Junction Transistors (BJT) are electronic devices used in low-power RF (radio frequency) applications to amplify and control small signals. They are commonly used in applications such as wireless communication, GPS, and radio broadcasting.

RF Small Signal BJTs are designed to handle low-power levels and operate at high frequencies, typically in the range of a few MHz to several GHz. They have a high gain and low noise figure, making them suitable for small signal amplification.

The RF Small Signal BJT consists of an emitter, base, and collector region, and works by controlling the flow of majority charge carriers (electrons or holes) between the emitter and collector through the base region. When a voltage is applied to the base-emitter junction, a small current flows through the base, allowing a larger current to flow from the emitter to the collector.

RF Small Signal Field Effect Transistors (FET) are electronic devices used in low-power RF (radio frequency) applications to amplify and control small signals. They are commonly used in applications such as wireless communication, GPS, and radio broadcasting.

RF Small Signal FETs are designed to handle low-power levels and operate at high frequencies, typically in the range of a few MHz to several GHz. They have a high gain and low noise figure, making them suitable for small signal amplification.

The RF Small Signal FET consists of a gate, source, and drain electrode, and works by controlling the flow of majority charge carriers (electrons or holes) between the source and drain regions through the gate electrode. When a voltage is applied to the gate electrode, it creates an electric field that modifies the conductivity of the channel, allowing current to flow between the source and drain.