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The PTFA 190451F - 45 W from Infineon Technologies is a RF Transistor with Frequency 1930 to 1990 MHz, Gain 17.5 dB, P1dB 45.0 W, Supply Voltage 28.0 V, Breakdown Voltage - Drain-Source 65 V. More details for PTFA 190451F - 45 W can be seen below.
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