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The ATF-551M4 from Avago Technologies is a RF Transistor with Frequency 450 to 6000 MHz, Noise Figure 0.5 dB, Supply Voltage 2.7V, Current 10 mA. More details for ATF-551M4 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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