3sk41 Datasheet 【99% Working】

Supplying clean low-noise amplification for radio receivers.

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.

While the metal CAN-4 package provides robust protection against thermal stress, the 3SK41 is exceptionally sensitive to . Because it uses ultra-thin insulated metal-oxide gates, a tiny static spark can permanently rupture the internal barriers.

Understanding the full electrical profile of this component requires a deep dive into the official specifications, pin configuration, and potential circuit replacements. Core Technical Specifications 3sk41 datasheet

Today, the 3SK41 is considered an part. For restorers of vintage gear, finding an original 3SK41 in its classic CAN-4 package is like finding a piece of gold—a small, four-legged silicon key to unlocking the pure, quiet reception of radio’s golden age. 3SK41 NEC/HITACHI/MOTOROLA IC Chips | Censtry

A highly popular, modern surface-mount (SOT-143) low-noise dual-gate MOSFET. Requires an adapter board if converting from TO-72 thru-hole.

Do you have any specific questions about the 3SK41 datasheet or its applications? Supplying clean low-noise amplification for radio receivers

[ DC Power Bus (up to 400V) ] | | +----+----+ | D | | | [Gate]----| G 3SK | Driver | | IC | S | +----+----+ | +-----> [ Load (Motor/Lamp) ] | GND

(metal can) package, which provides excellent shielding for RF stability. High Gain & Low Noise

Whether you are repairing a classic ICOM receiver, building a low-noise preamplifier for an SDR, or simply satisfying your curiosity about dual-gate MOSFETs, understanding the 3SK41’s pinout (TO-72), biasing (VG2 = 4V typical), and limitations (200mW, 30mA) is essential. The Sansui 8080 and 9090 models are particularly

| Part Number | Compatibility Notes | Availability | | :--- | :--- | :--- | | | Nearly identical pinout (SOT-103). Superior noise figure (2dB). Drop-in with adapter. | Scarce | | BF998 | Surface mount (SOT-143). Higher transconductance. Requires a breakout board. | Common | | 3SK74 | Direct Japanese equivalent. Same TO-72 package. Perfect for vintage restorations. | Rare | | MPF121 | American equivalent, but higher capacitance. Not ideal above 150 MHz. | Obsolete | | Dual-gate 40673 | Metal can. Higher VDS tolerance but lower gain. Works as a slow substitute. | Obsolete |

Designed to minimize internal noise, it is often used as a preamplifier for antenna signals in legacy TV sets and radio equipment. Pinout and Circuit Configuration

Dual-gate MOSFETs like the 3SK41 are unique because they decouple input and output capacitance. This engineering feat drastically cuts down the Miller effect, allowing stable, high-gain operation well into the VHF and UHF bands without requiring complex neutralization circuits. Technical Specifications Overview

: Ideal for front-end receiver stages where sensitivity is critical. Applications VHF/UHF amplifiers.