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RD70HVF1 by Mitsubishi Electric Semiconductor is a Field Effect Transistor for amplification in the final stage of a radio transceiver.RD70HVF1 by Mitsubishi Electric Semiconductor is a Field Effect Transistor (High Power Si MOSFET) for amplification in the final stage of a radio transceiver. It is rated at 12.5V with an output of 70W.