Datasheet: 3sk41

is primarily documented as a high-performance N-channel dual-gate MOSFET

The 3SK41 is a legacy N-channel dual-gate MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) primarily designed for high-frequency applications, such as VHF (Very High Frequency) amplifiers and mixers in radio and television tuners. Core Specifications 3sk41 datasheet

• Operation: A negative AGC voltage (0V to -4V) is applied to Gate 2. When the incoming signal is strong, the AGC voltage becomes more negative, reducing the drain current and lowering the gain to prevent overloading the mixer stage.
• Result: Excellent large-signal handling with constant distortion performance.

• Absolute Maximum Ratings: Such as maximum drain-source voltage (Vds), gate-source voltage (Vgs), and power dissipation (Pd).
• Electrical Characteristics: Including parameters like drain current (Id), gate-source cutoff voltage (Vgs(off)), and the drain-source on-resistance.
• Typical Characteristics: Graphs showing how the device's characteristics vary with temperature and other conditions.

Due to its age, it is frequently encountered in vintage "hybrid" transceivers (like Kenwood models) and is often replaced with more modern components for better performance.  Key Technical Specifications  Operation: A negative AGC voltage (0V to -4V)

Part 5: Application Circuit – 200MHz RF Amplifier

The classic application from the 3SK41 datasheet is a cascode-like RF amplifier. Unlike a single-gate MOSFET, Gate 2 acts as a shield and a gain control. Typical application circuits and pinout

In conclusion, the 3SK41 datasheet is more than a list of numbers. It is a testament to the ingenuity of the analog age. It documents the precise engineering that allowed millions of households to witness history on their television screens. Today, as the component itself vanishes from supply chains, the datasheet remains—a technical manual that has transformed into a historical document, reminding us that even the smallest components play a massive role in the march of progress.