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The MS1581 from Microsemi is a RF Transistor with Frequency 860 MHz, Gain 7 dB, Power 4 W, Supply Voltage 25 V, Current 0.85 A. More details for MS1581 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.