Datasheet — 3sk41
Since the 3SK41 is discontinued, you have three options:
The 3SK41 is not pin-compatible with standard JFETs like the MPF102. The most common package is the 4-pin TO-72 metal can. Viewing from the bottom (leads facing you, tab pointing up):
Pinout Image Description (Text): Bottom view, tab at 12 o'clock. Pin 1 (Source) is clockwise from the tab. Pin 4 (Drain) is counter-clockwise from the tab. 3sk41 datasheet
| Parameter | Test Condition | Min | Typ | Max | Unit | | :--- | :--- | :--- | :--- | :--- | :--- | | Drain Current (IDSS) | 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 |
| Parameter | Symbol | Rating | Unit | | :--- | :--- | :--- | :--- | | Drain-Source Voltage | VDS | 20 | V | | Gate 1 to Source Voltage | VG1S | ±15 | V | | Gate 2 to Source Voltage | VG2S | ±15 | V | | Drain Current | ID | 30 | mA | | Total Power Dissipation | PT | 200 | mW | | Channel Temperature | Tch | 125 | °C | | Storage Temperature | Tstg | -40 to +125 | °C | Since the 3SK41 is discontinued, you have three
One of the most common reasons for downloading a 3sk41 datasheet is to identify the pin configuration. The 3SK41 is typically packaged in a TO-72 metal can (4-pin) or a SIP (Single In-line Package) plastic case.
Before designing any circuit, you must respect the limits listed below. Exceeding these values will destroy the MOSFET, as it is extremely static-sensitive. Pinout Image Description (Text) : Bottom view, tab
| Parameter | Symbol | Rating | Unit | | :--- | :--- | :--- | :--- | | Drain-Source Voltage | VDS | 20 | V | | Gate 1 to Source Voltage | VG1S | ±15 | V | | Gate 2 to Source Voltage | VG2S | ±15 | V | | Drain Current | ID | 30 | mA | | Total Power Dissipation (Ta=25°C) | Ptot | 200 | mW | | Channel Temperature | Tch | 125 | °C | | Storage Temperature | Tstg | -40 to +125 | °C |
⚠️ Critical Warning: The input impedance of the 3SK41 is extremely high (in the megohm range). This makes it susceptible to damage from electrostatic discharge (ESD). Always use grounded soldering irons and anti-static wrist straps when handling.
