The 3SK41 utilizes a classic (frequently cross-referenced with the TO-72 form factor). The metal shell serves a dual purpose: it provides robust thermal dissipation and functions as a Faraday shield to decrease electromagnetic interference (EMI) when grounded.
The 3SK41 was developed in the late 1970s and early 1980s by Japanese manufacturers like Hitachi, NEC, and Sanyo. It was famously used in the RF front-ends of high-end analog television tuners (Channels 1-12) and FM radio receivers.
| Parameter | Test Condition | Min | Typ | Max | Unit | | :--- | :--- | :--- | :--- | :--- | :--- | | | VG1S = 0V | 2.5 | 7.0 | 15 | mA | | Gate 1 Cut-off Voltage | ID = 100 µA | -1.5 | -0.8 | -0.3 | V | | Forward Transfer Admittance (Yfs) | f = 100 MHz | 7 | 12 | - | mS | | Input Capacitance (Ciss) | f = 1 MHz | - | 3.5 | 5 | pF | | Reverse Transfer Capacitance (Crss) | f = 1 MHz | - | 0.05 | 0.2 | pF | | Output Capacitance (Coss) | f = 1 MHz | - | 1.8 | 2.5 | pF | | Noise Figure (NF) | f = 200 MHz, optimized | - | 4.0 | 6.0 | dB | | Power Gain (Gps) | f = 200 MHz | 18 | 23 | - | dB | 3sk41 datasheet
for frequency down-conversion in communications equipment. High-impedance instrumentation front-ends. Modern Substitutes & Equivalents
) and snappy transit times, the 3SK41 excels in analog gating circuits and power-conscious switching sub-systems. Direct Cross-References and Equivalents It was famously used in the RF front-ends
– The output terminal where the amplified RF signal or IF signal is extracted.
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Typically around 2.0 dB at 800 MHz, ensuring minimal signal degradation.
In RF receivers, one gate can be used for the signal input while the second gate handles an AGC voltage. This allows the circuit to dynamically adjust gain based on signal strength without detuning the input. Mixing Capabilities:
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