3sk41 Datasheet ((link)) -

: When downloading, look for a document dated between 1985 and 1995. Later "generic" datasheets sometimes contain errors for this specific part.

The Sansui G‑7500 , a high‑power receiver from the late 1970s, uses a 3SK41 in its front‑end RF amplifier stage. Other classic tuners from brands such as Kenwood, Pioneer, and Marantz also employed the 3SK41 or its close relatives (3SK40, 3SK45) in their FM sections. The Sansui 8080 and 9090 models are particularly well‑known for having tuners that rely on these fragile FETs, and their failure is a common point of failure in these otherwise robust receivers.

To help find exact substitute parts or layout diagrams, let me know: What (VHF or UHF) are you targeting? Are you repairing existing gear or building a new circuit ?

): 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 3sk41 datasheet

Used for Automatic Gain Control (AGC) biasing or local oscillator injection. Drain (D) Output terminal where the amplified RF signal is extracted. Dual-Gate MOSFET Operating Principles

): A measure of the transconductance. High transconductance indicates excellent signal amplification capabilities. AC / RF Performance Noise Figure ( NFcap N cap F

The output terminal where the amplified RF signal is collected. : When downloading, look for a document dated

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4-pin package (Source, Gate 1, Gate 2, Drain). Typical Applications: VHF/UHF TV Tuner RF Amplifiers. High-frequency mixers. General-purpose high-frequency signal processing. Key Performance Metrics:

The 3SK41 is an N-channel dual-gate silicon MOSFET designed primarily for high-frequency applications, such as RF (Radio Frequency) and microwave circuits. This component was originally manufactured by Japanese electronics leaders like NEC and Hitachi, and it remains a popular choice for hobbyists and engineers working with legacy RF designs. Technical Specifications Other classic tuners from brands such as Kenwood,

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While exact datasheet values can vary slightly by manufacturer (e.g., NEC, Hitachi, or Motorola), the standard parameters for this type of MOSFET include: