3sk41 Datasheet May 2026

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architecture. This provides two independent control points for the channel, offering several benefits: Automatic Gain Control (AGC): 3sk41 datasheet

  • Device type: N-channel enhancement-mode MOSFET (small-signal)
  • Package: Likely TO-92 or SOT-23 (common small-signal MOSFET packages)
  • VDS (drain–source voltage): ~30–60 V (typical for small-signal MOSFETs)
  • ID (continuous drain current): ~100–500 mA
  • RDS(on): a few ohms to tens of ohms (varies by gate voltage; typically specified at VGS = 10 V and/or 4.5 V)
  • VGS(th) (gate threshold): ~0.5–3 V
  • Power dissipation: a few hundred mW (TO-92 ~400–625 mW)
  • Gate charge/Cgs: small (pF range)
  • Typical applications: switching small loads, level shifting, analog switches
  1. Initialization: The system reads the load status. The 3SK41 is in the 'OFF' state ($V_GS < V_th$).
  2. Soft-Start Phase: The microcontroller begins switching the 3SK41 at a high frequency (e.g., 20kHz). The duty cycle starts at 0% and slowly increments to 100% over a user-defined period (e.g., 2 seconds).
  3. Steady State: Once 100% duty cycle is reached, the 3SK41 is fully enhanced ($R_DS(on)$ is minimized), allowing efficient current flow with minimal heat generation.

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 6dB and practically eliminated cross-modulation. Suddenly, the 10-meter band, once a wall of static, became a window to the world. Technical Profile However, I can guide you on how to

BF960 / BF981: Common European dual-gate MOSFETs used for VHF/UHF. Initialization: The system reads the load status

Part 5: Application Circuit – 200MHz RF Amplifier

The classic application from the 3SK41 datasheet is a cascode-like RF amplifier. Unlike a single-gate MOSFET, Gate 2 acts as a shield and a gain control.

RF Amplifiers: Providing initial signal boost for weak radio waves.