3sk41 Datasheet Jun 2026

When handling the 3SK41, it is essential to take precautions to prevent damage from electrostatic discharge (ESD). The transistor should be handled by the leads only, and not by the body. Additionally, the operating conditions should be within the specified limits to ensure reliable operation.

Sourcing authentic old-stock units can be navigated via specialized component vendors such as Littlediode or Utsource . Always confirm the physical package type matches your PCB footprint before purchasing, as some similarly named variants may ship in surface-mount mini-mold packages. If you are replacing a faulty component, tell me:

| Parameter | Conditions | Value | | :--- | :--- | :--- | | | - | 5 pF | | On-State Resistance (RDS(on)) | - | 200 Ω |

The core strength of the 3SK41 lies in its independent . This architecture places two separate control gates in a series-like configuration along a single N-type channel. 3sk41 datasheet

The story goes that when hams swapped out their stock transistors for the 3SK41 in the balanced mixer stage, the change was "amazing". It didn't just boost the signal; it dropped the internal noise floor by as much as and practically eliminated cross-modulation. Suddenly, the 10-meter band, once a wall of static, became a window to the world. Technical Profile

The is a specialized N-channel dual-gate MOSFET designed primarily for RF (Radio Frequency) amplification and high-frequency applications. Known for its exceptional performance in sensitive receiver front-ends, this transistor, often manufactured by giants like NEC, Hitachi, or Motorola, provides low-noise, high-gain amplification.

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. When handling the 3SK41, it is essential to

The dual-gate structure allows for superior gain control (AGC) and high stability by reducing the internal capacitance between the drain and the primary gate. www.jotrin.ru The "Deep Story": A Relic of the Analog Era

) is kept under 5.0 pF, it causes very little loading on input tuning networks.

For new designs, use the BF998R . For repairing a vintage 1980s TV tuner, search eBay or specialty surplus stores for NOS (New Old Stock) 3SK41B . Sourcing authentic old-stock units can be navigated via

Acts as an automatic gain control (AGC) node or a shield. It significantly drops the internal reverse transfer capacitance ( Crsscap C sub r s s end-sub

: Designed for efficient power management and high-speed signal processing. cap R sub cap D cap S open paren o n close paren end-sub

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)

Because the 3SK41 is sensitive to ESD, follow these basic precautions when working with it.

This part number does not match a standard JEDEC, EIAJ, or popular European Pro Electron transistor registration. It could be: