The MGF4937AM from Mitsubishi Electric US, Inc. is a RF Transistor with Frequency DC to 12 GHz, Gain 11.5 to 13 dB, Noise Figure 0.35 to 0.50 dB, Supply Voltage 2 V, Storage Temperature -55 to 125 Degree C. Tags: Flanged. More details for MGF4937AM can be seen below.