Balanced mixers (often used in amateur radio equipment modifications to reduce noise and overload). General-purpose high-speed switching. Censtry.com Why the Dual-Gate Design?
In mixer circuits, the local oscillator signal can be applied to Gate 2 while the RF signal is applied to Gate 1, allowing for efficient frequency conversion with low cross-modulation. Applications & Substitutes Common Uses:
💡 Always use ESD (Electrostatic Discharge) protection when handling MOSFETs, as they are extremely sensitive to static voltage which can puncture the thin gate oxide. If you are working on a specific circuit, let me know: Are you replacing a broken part or building a new project? What frequency range are you targeting?
The 3SK41 remains a classic, robust component for radio frequency applications. Its high transconductance, dual-gate capability, and low-noise characteristics make it a valuable transistor for sensitive RF amplification tasks.
Used for general-purpose signal conversion and switching in alarms and security systems. Datasheet Resources 3sk41 datasheet
NOS (New Old Stock) 3SK41 transistors can occasionally be found on eBay and from specialized vintage component suppliers. The part is also listed on electronic component sourcing platforms like Utsource , though caution is advised, as counterfeit or remarked parts are common.
: 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.
The 3SK41 is designed for low-noise, high-gain performance at high frequencies. Below are the typical parameters for this device: Drain-Source Voltage ( cap V sub cap D cap S end-sub Drain Current ( cap I sub cap D Power Dissipation ( cap P sub cap D 250mW (0.25W) Package Type: TO-72 (4-lead metal can) Drain-Source On-Resistance ( cap R sub cap D cap S open paren o n close paren end-sub Functional Overview
Because the 3SK41 is no longer in active mass production by original semiconductor giants, looking up active inventory or complete datasheet indexes requires targeting legacy electronic component distributors: Balanced mixers (often used in amateur radio equipment
. Always verify bias voltages.
In superheterodyne receiver circuits, the 3SK41 operates as a low-noise mixer. The RF signal is fed to G1cap G sub 1 , while the local oscillator (LO) frequency drives G2cap G sub 2
These typical or guaranteed values define how the device behaves in normal operation.
The 3SK41 is versatile within the RF spectrum. You will commonly find it used in: In mixer circuits, the local oscillator signal can
I was unable to locate a specific datasheet for a component labeled in my available technical databases or general search results.
Used in receiver RF amplifiers and balanced mixer stages, particularly in legacy radio gear. Equivalents: If the 3SK41 is unavailable, common substitutes include the 3SK40, 2SK701, 2SK702, and 2SK703 Legacy Availability:
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utilizing active AGC loops.