The FLL57MK from Sumitomo Electric Device Innovations is a RF Transistor with Frequency 2.3 GHz, Power 35.5 to 36 dBm, Power(W) 3.55 to 3.98 W, P1dB 35.5 to 36 dBm, Power Gain (Gp) 10.5 to 11.5 dB. Tags: Flanged. More details for FLL57MK can be seen below.