The BW431 from Sainty-Tech Communications Limited is a Voltage Controlled Oscillator with Frequency 9.10 to 10.30 GHz / 4.55 to 5.15 GHz, Power 5.01 to 10 mW, Phase Noise -111 dBc/Hz, Phase Noise dBc/Hz @100kHz -111 dBc/Hz, Harmonic Supression -30 dBc. Tags: Die. More details for BW431 can be seen below.