This post explains for the transistor.
The Part Number is 3SK74.
The function of this semiconductor is 20V, 25mA, MOSFET.
Manufacturer: NEC Electronics
See the preview image and the PDF file for more information.
The 3SK74 is 20V, 25mA, N-Channel Silicon dual-gate MOSFET. A dual-gate MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is a type of MOSFET that has two gate terminals instead of the usual one gate terminal found in standard MOSFETs. These dual-gate MOSFETs provide additional control and flexibility in electronic circuit design.
An N-channel MOSFET (Metal Oxide Semiconductor Field Effect Transistor) is a type of field effect transistor (FET) that uses an N-type semiconductor material as the conducting channel to control the flow of current.
When a positive voltage is applied to the gate terminal, it attracts electrons to the channel, creating an inversion layer and allowing current to flow between the source and drain terminals.
N-channel MOSFETs are widely used in a variety of electronic applications due to their high input impedance, fast switching speeds, and low power consumption. They are commonly used as switches, amplifiers, and voltage regulators.
1. Suitable for use as RF amplifier & Mixer in VHF TV Tuner
2. Low Crss : 0.03pF Typ.
3. High PG : 22dB Typ.
4. Low NF : 2.0dB Typ.
Absoulte Maximum ratings :
1. Drain to Source Voltage : Vdsx = 20 V
2. Gate1 to Source Voltage : Vg1s = ± 10 V
3. Gate2 to Source Voltage : Vg2s = ± 10 V
4. Drain Current : Id = 25 mA
5. Total Power Dissipation : Pt – 200 mW
3SK74 PDF Datasheet
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