The A3T21H450W23S from NXP Semiconductors is a RF Transistor with Frequency 2155 MHz, Gain 15.5 dB, Power 49 dBm(89 W), Supply Voltage 31 Vdc, Drain Current 1000 mA. More details for A3T21H450W23S 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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