The ML4660 from Spectrum Control is a RF PIN Diode with Insertion Loss 1 to 1.5 dB, Isolation 20 to 25 dB, Reverse Current 10 uA, Breakdown Voltage 15 to 25 V, Thermal Resistance 80 to 100 Degree C/W. Tags: Chip. More details for ML4660 can be seen below.