3sk41 Datasheet 'link' Jun 2026

If you are currently executing a repair or designing an emulation layout, let me know:

Connected to ground/common loop, often shared with the metal shield. Gate 1 (G1) The primary RF signal input pin; dictates transconductance. Pin 3 Gate 2 (G2)

Direct high-gain, low-noise functional Japanese equivalents designed for identical RF front-end systems.

Front-end RF low-noise amplifiers (LNAs) for legacy television and FM radio tuners.

The isn't just a part number; in the world of vintage amateur radio, it’s often remembered as the "silent hero" that cleaned up the airwaves. The Legend of the 3SK41 3sk41 datasheet

Offers stable matching characteristics for RF preamplifier substitutions.

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

Due to its high-speed switching capabilities, low noise figure, and linear transfer traits, the 3SK41 is commonly found in:

The 3SK41 is an (Metal-Oxide-Semiconductor Field-Effect Transistor). Unlike a standard MOSFET with one gate, the dual-gate structure (Gate 1 and Gate 2) allows for superior performance in: If you are currently executing a repair or

The 3SK41 is a depletion‑mode, N‑Channel dual‑gate MOSFET. Unlike a standard MOSFET, it features two electrically independent gate terminals (Gate1 and Gate2) that provide greater flexibility in circuit design, especially for gain control and mixer stages. The four leads (Source, Drain, Gate1, Gate2) are housed in a compact hermetically sealed , a standard for high‑reliability RF transistors of its era.

The 3SK41 typically comes in a metal-can package (similar to TO-72) with four leads. Proper identification of the leads is critical for circuit stability.

Because it is a dual-gate device, the pinout contains two separate gate terminals:

Are you trying to calculate the for an RF circuit? Based on direct electrical comparison

The CAN-4 package features four distinct leads. Unlike modern surface-mount devices, the metal case of the 3SK41 is often tied directly to one of the pins (usually the Source or a dedicated shield pin) to reduce stray capacitance and provide electromagnetic shielding at VHF/UHF frequencies. Pin Number Terminal Name Description Source (S)

In superheterodyne receiver circuits, the 3SK41 operates as a low-noise mixer. The RF signal is fed to G1cap G sub 1 , while the local oscillator (LO) frequency drives G2cap G sub 2

The 3SK41 has been obsolete for decades. You will likely need a replacement. Based on direct electrical comparison, here are the best :

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