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.
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
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