The SGK5254-120A-R from Sumitomo Electric Device Innovations is a RF Transistor with Frequency 5.2 to 5.4 GHz, Power 551.5 dBm, Power(W) 100 to 141.25 W, Gain 15 to 16.5 dB, Power Added Effeciency 0.47. Tags: Flanged. More details for SGK5254-120A-R can be seen below.