Furthermore, the datasheet highlights a growing crisis in the "Right to Repair" movement. For vintage audiovisual enthusiasts and archivists, the 3SK41 is a critical component. When a vintage Sony Trinitron from the 1980s fails to pick up a signal, it is often this small, metal-can transistor that has failed. The datasheet provides the necessary "pinout" and replacement specifications, allowing a modern engineer to hunt for a modern equivalent (like the BF998) to keep the antique running. Without the datasheet, the device is a black box; with it, the device can be understood, reverse-engineered, and potentially revived.
The dual-gate construction of the 3SK41 can be modeled as two independent FETs connected in a cascode configuration within a single package. This specific topology provides two massive design advantages: Automatic Gain Control (AGC)
: 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 3sk41 datasheet
While implementing this feature, the designer must adhere to the graph in the 3SK41 datasheet. During the soft-start ramp, the transistor passes through the linear region where both Voltage ($V_DS$) and Current ($I_D$) are high. The soft-start duration must be calculated carefully so that the transient thermal limit of the 3SK41 is not exceeded during this transition.
Due to its age, it is frequently encountered in vintage "hybrid" transceivers (like Kenwood models) and is often replaced with more modern components for better performance. Key Technical Specifications Furthermore, the datasheet highlights a growing crisis in
When selecting a replacement, pay close attention to the and the bias requirements (depletion‑mode versus enhancement‑mode), as not all MOSFETs are directly interchangeable.
3SK41 (Silicon N-Channel Power MOSFET) Key Datasheet Parameters: The Sansui G‑7500
All. Datasheet. Distributor. Manufacturer. 3SK41. 3SK4. Match, Like. No Data. 3SK40(1) 3SK45(2) Start with. No Data. No Data. End. ALLDATASHEET.COM 3SK41 - NEC/HITACHI/MOTOROLA - Jotrin Electronics
Usually connected to the case/shield to reduce noise. Drain: The output terminal. Gate 2: The control or AGC terminal. Gate 1: The signal input terminal. 📻 Common Applications VHF Tuners: Used in television and FM radio front-ends.
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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.