The ML4672 from Spectrum Control is a RF PIN Diode with Insertion Loss 0.7 to 1 dB, Isolation 20 to 25 dB, Reverse Current 10 uA, Breakdown Voltage 400 to 450 V, Thermal Resistance 20 to 25 Degree C/W. Tags: Chip. More details for ML4672 can be seen below.