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The TPR400A from Microsemi is a RF Transistor with Frequency 1030 to 1090 MHz, Gain 9.5 dB, Power 400 W, Input Power 45 W, Supply Voltage 50 V. More details for TPR400A 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
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