: Ideal for the front end of receivers (pre-amplifiers) due to its low noise figure.
: Bottom view, tab at 12 o'clock. Pin 1 (Source) is clockwise from the tab. Pin 4 (Drain) is counter-clockwise from the tab.
Ciss(max)cap C sub i s s open paren m a x close paren end-sub Maximum capacitance seen looking into the gate Anatomy of a Dual-Gate MOSFET 3sk41 datasheet
When working with this component, always employ anti-static wrist straps, grounded soldering irons, and handle the component strictly by its metal casing rather than its long pins. Ensure operating environments do not breach its specified thermal ceiling to safeguard continuous performance. 3SK41 Cross-Reference & Modern Equivalents
The , primarily designed for high-frequency amplification. It functions as a critical component in the RF (radio frequency) front-end stages of communication devices. Many online sources, such as Utsource, may incorrectly identify it as a NEC four-channel relay . However, this is a mistake; the correct classification is a dual-gate MOSFET . Key manufacturers include Toshiba and NEC. : Ideal for the front end of receivers
When working with the 3SK41, always refer to the latest datasheet for the most up-to-date specifications and characteristics.
The signal output. It connects to the primary RF tank circuit or intermediate frequency (IF) transformer setup. Pin 4 (Drain) is counter-clockwise from the tab
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]
| Part Number | Compatibility Notes | Availability | | :--- | :--- | :--- | | | Nearly identical pinout (SOT-103). Superior noise figure (2dB). Drop-in with adapter. | Scarce | | BF998 | Surface mount (SOT-143). Higher transconductance. Requires a breakout board. | Common | | 3SK74 | Direct Japanese equivalent. Same TO-72 package. Perfect for vintage restorations. | Rare | | MPF121 | American equivalent, but higher capacitance. Not ideal above 150 MHz. | Obsolete | | Dual-gate 40673 | Metal can. Higher VDS tolerance but lower gain. Works as a slow substitute. | Obsolete |