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The MRF428 from MACOM is a RF Transistor with Frequency 1.5 to 30 MHz, Gain 13 dB, Power 150 W, Supply Voltage 50 V. More details for MRF428 can be seen below.
450 Watt, 50 Volt, 3.1 to 3.5 GHz, GaN RF IMFET
15 Watt, 50 Volt, DC to 4 GHz, GaN RF Transistor
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