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The 0912-45 from Microsemi is a RF Transistor with Frequency 960 to 1215 MHz, Gain 8 dB, Power 45 W, Input Power 7 W, Supply Voltage 50 V. More details for 0912-45 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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