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The MRF4427G from Microsemi is a RF Transistor with Voltage - Collector Emitter (Vceo) 20 V. More details for MRF4427G can be seen below.
1805 to 1880 MHz, 89 W Airfast RF Power LDMOS Transistor
4500 to 5900 MHz GaN HEMT for C-Band Radar Systems
GaN HEMT Transistor 1.2 to 1.4 GHz
You can now find similar products from multiple companies on everything RF.