The SGN21-120H-R from Sumitomo Electric Device Innovations is a RF Transistor with Frequency 1.7 to 2.5 GHz, Power 51 to 51.9 dBm, Power(W) 125.89 to 154.88 W, Duty_Cycle 10 to 25%, Power Gain (Gp) 14.5 to 15.4 dB. Tags: Flanged. More details for SGN21-120H-R can be seen below.