3sk41 Datasheet Fixed Jun 2026

If replacing a 3SK41 (TO-72) with a BF998 (SOT-143):

| 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

The 3SK41 typically comes in a metal-can package (similar to TO-72) with four leads. Proper identification of the leads is critical for circuit stability. If replacing a 3SK41 (TO-72) with a BF998

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