3sk41 Datasheet -

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

: Excellent for sensitive, low-level signal detection.

Do you prefer components, or are surface-mount (SMD) alternatives acceptable? 3sk41 datasheet

The control or modulation input. This is typically used for AGC biasing or local oscillator (LO) injection in mixer circuits.

It is currently considered an obsolete or "hard-to-find" part but can still be sourced through specialty electronic distributors like Jotrin Electronics While exact datasheet values can vary slightly by

This article provides a detailed overview of the 3SK41’s technical specifications, real‑world applications, available replacement options, and essential guidance for sourcing and handling this vintage component. This information is intended for electronics hobbyists, vintage audio restorers, and RF design engineers who need to understand, replace, or work with the 3SK41.

The 3SK41’s two gate terminals are its defining feature. In a typical dual‑gate MOSFET, is the input that receives the RF signal to be amplified, while Gate 2 is used for a control voltage. By varying the voltage on Gate 2, the circuit can adjust the transistor’s gain, a technique known as Automatic Gain Control (AGC) in receivers. This allowed radio designers to build simpler and more sensitive front‑ends for FM tuners without relying on variable attenuators or multi‑stage control loops. This is typically used for AGC biasing or

Provides significant signal boost in the VHF range.

(Adjust resistor and choke values to meet the datasheet’s recommended bias point where gm is adequate and ID within limits.)

Understanding the 3SK41 Datasheet: Core Specs, Pinout, and RF Applications

Typically connected to the system ground or a self-biasing resistor network. The substrate is often tied to this lead to minimize RF feedback.