3sk41 Datasheet May 2026

Summary: the 3SK41 is an N‑channel dual‑gate MOSFET (small RF/low‑power device in a CAN/TO‑style metal can) used historically in VHF/UHF tuner and RF front‑end circuits. Below I break down what a datasheet for this part usually contains, explain the key specs, show how they affect circuit behavior, give practical tips for selection, testing, PCB layout and replacement/cross‑reference, and include simple application examples.

The circuit uses the 3SK41 as the primary power-switching element. 3sk41 datasheet

Original equipment manufacturers (Hitachi, NEC) no longer host these files. However, you can find scanned, authentic copies at: Summary: the 3SK41 is an N‑channel dual‑gate MOSFET

Pro Tip: When downloading, look for a document dated between 1985 and 1995. Later "generic" datasheets sometimes contain errors for this specific part. Absolute maximum ratings

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.

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.