These typical or guaranteed values define how the device behaves in normal operation.
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:
: Common modern substitutes with high transconductance and low noise for RF applications.
The 3SK41 was a popular choice for the RF amplifier stage in the FM tuner sections of high-fidelity receivers. Its low-noise figure and high gain made it ideal for capturing weak FM signals.
The 3SK41 is a JFET (Junction Field-Effect Transistor) used in various electronic circuits. If you're looking for information on this component, you've come to the right place. Below, we'll provide an overview of the 3SK41, its features, and its datasheet.
: N-Channel Dual-Gate MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor). Manufacturer(s) : NEC / Hitachi / Motorola. 3sk41 datasheet
VBR(GSS)cap V sub cap B cap R open paren cap G cap S cap S close paren end-sub Maximum absolute rating for both isolated gates Id(max)cap I sub d open paren m a x close paren end-sub Maximum continuous current carrying capacity Power Dissipation PDcap P sub cap D Total allowable power dissipation at room temp Forward Transfer Admittance gfs(min)g sub f s open paren m i n close paren end-sub Minimum transconductance demonstrating signal gain Input Capacitance
The 3SK41 typically comes in a specialized 4-pin miniature plastic package (often designated as a variant of the TO-50 or a standard 4-pin RF lead frame). Because it is a high-frequency device, the pinout layout is designed to maximize isolation between the input and output.
| Variant | IDSS (Zero gate voltage) | Typical Application | | :--- | :--- | :--- | | | 2.5 – 15 mA (Wide spread) | General purpose, factory selected for tuners. | | 3SK41A | 2.5 – 7.0 mA (Lower) | Best for battery-operated devices or lower noise applications. | | 3SK41B | 7.0 – 15 mA (Higher) | Best for high-gain stages (e.g., VHF TV tuner mixers). |
. The isolated dual-gate architecture ensures excellent port-to-port isolation between the LO and RF circuits, minimizing harmonic distortion and noise cross-talk. Common Applications
The electrical parameters of the 3SK41 highlight its optimization for low-power, high-gain signal processing. Below is a breakdown of the key data values typically listed in its technical data sheet: Maximum / Standard Value These typical or guaranteed values define how the
N-Channel Silicon Dual-Gate MOS Field-Effect Transistor.
Front-end amplification in FM, VHF, and UHF receivers.
For new designs, use the BF998R . For repairing a vintage 1980s TV tuner, search eBay or specialty surplus stores for NOS (New Old Stock) 3SK41B .
Gate 1, Gate 2, Source, Drain (often with a 4th lead for the case/shield) Commonly Available Data Sources: Alldatasheet - 3SK41L Veswin 3SK41 Description Utsource 3SK41 Description
When reviewing the 3SK41 datasheet, the absolute maximum ratings are critical to prevent component failure. Operating beyond these limits can cause permanent damage. Drain-Source Voltage Gate 1-Source Voltage Gate 2-Source Voltage Drain Current Total Power Dissipation Storage Temperature -55 to +150 3. Electrical Characteristics Under typical operating conditions (usually at ), the 3SK41 exhibits the following performance: Forward Transfer Admittance ( The 3SK41 was a popular choice for the
This structural shielding eliminates the need for complex neutralization circuits, providing cleaner layouts for active RF designs. Key Applications & Use Cases Thanks to its low continuous current limits (
Standard intermediate frequency amplification in communications receivers. 🔄 Modern Alternatives and Equivalents
): Measures the leakage current when the gates are reverse-biased. It is kept extremely low (typically under a few microamps) to preserve signal purity. Gate 1 Cut-off Voltage (
Gate 2 can be used for Automatic Gain Control (AGC), allowing the amplifier's gain to be adjusted without significantly affecting the input impedance.