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The MS1579 from Microsemi is a RF Transistor with Frequency 845 MHz, Gain 8.5 dB, Power 14 W, Supply Voltage 25 V, Current 1.65 A. More details for MS1579 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.