The MRF5S4125N from NXP Semiconductors is a RF Transistor with Frequency 450 to 480 MHz, Gain 23 dB at 23 MHz, Power 125 W, P1dB 125 W, Supply Voltage 28 V. More details for MRF5S4125N 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
15W, 300 MHz to 1.215 GHz, GaN RF Input-Matched Transistor
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