3sk41 Datasheet (Web)

The second gate acts as a shield between the input gate and the drain, drastically reducing internal feedback (Miller effect).

: Before soldering, always verify the pinout (gate1, gate2, source, drain) of any replacement. Different manufacturers may have different lead configurations, even for similarly numbered parts. A multimeter in diode mode can be used to identify the source and drain pins, but an actual transistor tester is strongly recommended.

): Crucial for stability, this value is exceptionally low (around 0.02 pF to 0.03 pF). This minimal feedback capacitance is what allows the 3SK41 to amplify UHF signals stably without self-oscillating. 5. How the Dual-Gate Structure Works in Circuit Design 3sk41 datasheet

Similar dual-gate MOSFETs frequently used in RF stages.

Because the 3SK41 is a legacy component, finding original, pristine parts from authorized distributors can be challenging. Most available stock consists of New Old Stock (NOS) or pull-offs from surplus electronics. The second gate acts as a shield between

The 3SK41 was engineered to provide high gain and low noise figures in high-frequency circuits. Below are the typical electrical characteristics found in the original datasheet. Maximum 20V Drain Current (Id): Maximum 25mA Gate-Source Voltage (Vgs1/Vgs2): ±10V Power Dissipation (Pd): 200mW Forward Transfer Admittance (|yfs|): 10 to 18 mS Input Capacitance (Ciss): ~5.0 pF Noise Figure (NF): ~2.0 dB at 200 MHz 🛠️ Key Features and Advantages

) (Typically used for Automatic Gain Control or Local Oscillator injection). (Primary RF signal input). Architectural Advantages & Dynamic Performance A multimeter in diode mode can be used

When buying replacement stock, look out for the complete markings to ensure you are receiving the low-noise, high-temperature resilient metal-can variant rather than an unrelated standard transistor. If you are troubleshooting a specific circuit, let me know:

TO-72 / CAN-4 Pinout (Bottom View) (Case/Shield) [Pin 4] (Gate 2) o o (Gate 1) [Pin 3] [Pin 1] o o (Drain) (Source) [Pin 2] [Pin 5 / Tab]

Because the original 3SK41 is an obsolete part that can be difficult to source or expensive to purchase through legacy distributors like Littlediode , cross-referencing alternative part numbers is a common necessity. Depending on the circuit layout and performance parameters, the following parts serve as suitable substitutes: Component Part Number Package Type Key Structural Differences / Notes TO-72 / CAN-4