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The 10500 from Microsemi is a RF Transistor with Frequency 1090 MHz, Gain 8.5 dB, Power 500 W, Input Power 70 W, Supply Voltage 50 V. More details for 10500 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
You can now find similar products from multiple companies on everything RF.