): 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
For those willing to perform a small mechanical adaptation, the BF998R is an N‑channel dual‑gate MOSFET in a SOT‑143 package. It is still in production and has superior noise figure and gain. It can be glued to a small adapter board or carefully soldered to wires to replace a TO‑72 device. Other possibilities include BF960 , BF961 , and BF981 . 3sk41 datasheet
: Bottom view, tab at 12 o'clock. Pin 1 (Source) is clockwise from the tab. Pin 4 (Drain) is counter-clockwise from the tab. ): This is the standout feature of the 3SK41
A complete datasheet PDF is not widely available for this vintage component. The information above represents the most reliable compilation of the device’s parameters from various component databases and service manuals. It is still in production and has superior
If designing a new circuit, use these active MOSFETs:
Typically acts as the primary signal injector. Because the input capacitance ( Cisscap C sub i s s end-sub
This circuit is ideal for FM radio (88-108 MHz) or aircraft band (118-136 MHz).