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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.
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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