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The MRF5943C from Microsemi is a RF Transistor with Frequency 1000 MHz. More details for MRF5943C 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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