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The MRF157 from MACOM is a RF Transistor with Frequency 5 to 80 MHz, Gain 21 dB, Power 600 W, Supply Voltage 50 V. More details for MRF157 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
You can now find similar products from multiple companies on everything RF.