3sk41 Datasheet |work| «2024»
If replacing a 3SK41 (TO-72) with a BF998 (SOT-143):
If you are working on a project and cannot find a 3SK41, modern equivalents like the or older substitutes like the
): A measure of the transconductance. High transconductance indicates excellent signal amplification capabilities. AC / RF Performance Noise Figure ( NFcap N cap F
is a high-frequency Silicon N-Channel Dual-Gate MOSFET primarily used in VHF amplifier and mixer applications. Manufactured by companies like NEC, Hitachi, and Motorola
A popular modern replacement for RF applications offering high transconductance and low noise. 3sk41 datasheet
The second gate (Gate 2) is specifically designed for Automatic Gain Control (AGC). By varying the voltage on Gate 2, the gain of the amplifier can be adjusted without significantly shifting the input impedance or frequency response. 2. Low Feedback Capacitance
): Typically ranges between 10 to 20 mS (millisiemens), indicating high sensitivity. Generally around 5.0 pF. Reverse Transfer Capacitance ( Crsscap C r s s
If you're restoring a vintage radio or building a high-fidelity RF front end, the 3SK41 datasheet is a must-read for its precise pinout and voltage ratings.
Used as a low-noise mixer in heterodyne receivers. If replacing a 3SK41 (TO-72) with a BF998
Gallium Arsenide (GaAs) for superior electron mobility. Configuration: Dual-Gate N-Channel depletion mode. Primary Focus: Low noise figure and high power gain.
The 3SK41's unique design makes it ideal for several RF-specific scenarios:
Do you prefer components, or are surface-mount (SMD) alternatives acceptable?
) and snappy transit times, the 3SK41 excels in analog gating circuits and power-conscious switching sub-systems. Direct Cross-References and Equivalents Manufactured by companies like NEC, Hitachi, and Motorola
If you are searching for the , you are likely either repairing a classic tuner from the 1980s–1990s, designing a low-noise front-end for a receiver, or trying to cross-reference a replacement. This article serves as a detailed datasheet analysis, covering absolute maximum ratings, electrical characteristics, pin configurations, application circuits, and modern alternatives.
For detailed and accurate information, we recommend checking with:
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
The is a classic, high-performance N-channel dual-gate MOSFET packaged in a specialized metallic CAN-4 (TO-72) housing . Sourced over the years by major semiconductor pioneers like NEC, Hitachi, and Motorola , this discrete transistor is highly optimized for radio frequency (RF) amplification, mixing, and high-speed switching applications.
): This is the standout feature of the 3SK41. It offers a very low noise figure (often below 2.0 dB at 400 MHz), making it ideal for the first stage of a radio receiver (Low Noise Amplifier or LNA). Power Gain ( Gpscap G sub p s end-sub
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: