Hitachi VCR model# VTFX621A, Q0851 is stamped on the part as FS3KM. What is it and is there an ECG equivalent?
What “FS3KM” is, is a fast-switching Mitsubishi FET. The “3” = 3 Amp, “KM” = TO-220F (isolated). I cannot give you a guaranteed ECG cross, though, because you did not provide the number that indicates the voltage, which comes after the “KM”. Multiply this number by 50 Volts to get the FET’s voltage rating, ranging from -9 = 450 Volts, to -18 = 900 Volts. Without knowing the voltage rating for a closer match, I can only suggest trying ECG2399 or NTE2399 with an insulator, since its 1KV voltage rating exceeds that of all the FETs in the Mitsubishi series, but using it may be overkill.
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