3sk41 | Datasheet Link

. Today, they are "New Old Stock" (NOS) treasures sought after by hobbyists restoring vintage ham radios or high-end tuners. The Component Hunt:

): Extremely low (approx. 0.02 pF), which is vital for stability in high-frequency amplifiers. Typically 2.0 to 3.0 dB at 200 MHz. 4. Pinout Configuration

Suitable for high-speed power management and signal switching. Common Applications 3sk41 datasheet

Often used in receiver front-ends to improve sensitivity and selectivity.

In an RF amplifier stage, the weak antenna signal is fed into . A variable DC voltage from the receiver’s AGC circuit is applied to Gate 2 . By varying the Gate 2 voltage, the transconductance of the device changes, allowing smooth attenuation of strong signals without detuning the input resonant circuit connected to Gate 1. Low-Noise Mixing the transconductance of the device changes

RDS(on)cap R sub cap D cap S open paren o n close paren end-sub to reduce thermal dissipation during conduction cycles. Pinout and Mechanical Configuration

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). For the 3SK41, this sits around 10 to 18 mS (millisiemens). High transconductance directly correlates to the high gain capability of the FET. Input Capacitance ( Cisscap C sub i s s end-sub

The 3SK41 solves this by using two independent gates in a series configuration resembling a cascode circuit: acts as the primary signal input. Gate 2 ( G2cap G sub 2 ) acts as an RF shield between Gate 1 and the Drain.

Controlling amplifier gain in receivers. 6. 3SK41 Alternatives and Equivalents