3sk41 Datasheet -
The 3SK41 has the following electrical characteristics:
It is currently considered an obsolete or "hard-to-find" part but can still be sourced through specialty electronic distributors like Jotrin Electronics
Niche inventory holders such as Jotrin Electronics , Veswin Electronics, and UTSource frequently catalog hard-to-find components for commercial and industrial repair centers.
The 3SK41 has been found in numerous high-end electronic devices from the 1970s and 1980s. It is often located on the RF amplifier board or the front-end tuner module. Common applications include: 3sk41 datasheet
In superheterodyne receivers, the dual-gate structure allows one gate to receive the RF (Radio Frequency) signal and the other to receive the LO (Local Oscillator) signal, mixing them with high isolation and low noise. Key Performance Features
Provides significant amplification in the RF stage to improve receiver sensitivity. Common Applications & Use Cases
): Crucial for stability, this value is exceptionally low (around 0.02 pF to 0.03 pF). This minimal feedback capacitance is what allows the 3SK41 to amplify UHF signals stably without self-oscillating. 5. How the Dual-Gate Structure Works in Circuit Design The 3SK41 has the following electrical characteristics: It
: Used in mixing and switching circuits for electronic equipment. Power Management : High-speed switching in compact power supplies.
): This is the standout feature of the 3SK41. It offers a very low noise figure (often below 2.0 dB at 400 MHz), making it ideal for the first stage of a radio receiver (Low Noise Amplifier or LNA). Power Gain ( Gpscap G sub p s end-sub
The dual-gate construction reduces the internal capacitance between the drain and the input gate, which improves stability and prevents unwanted oscillations at high frequencies. Typical Pinout (TO-72 Style) This minimal feedback capacitance is what allows the
). For the 3SK41, this sits around 10 to 18 mS (millisiemens). High transconductance directly correlates to the high gain capability of the FET. Input Capacitance ( Cisscap C sub i s s end-sub
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: A simple Google search with the part number and the term "datasheet" can often lead you to the right document. For example, searching for "3sk41 datasheet" might yield results from various electronic component distributors or manufacturer websites.
If you are designing a new circuit, it is highly recommended to look for modern silicon or GaAs dual-gate MOSFETs/MESFETs. Common replacements in legacy repairs or alternative modern parts include:
The signal output. It connects to the primary RF tank circuit or intermediate frequency (IF) transformer setup.
