The STAC0912-250 from STMicroelectronics is a RF Transistor with Frequency 960 MHz to 1.215 GHz, Power 53.979 to 54.548 dBm, Power(W) 250 to 285 W, Power Gain (Gp) 14 to 16.3 dB, Efficiency 50 to 58 %. More details for STAC0912-250 can be seen below.