The ML4620 from Spectrum Control is a RF PIN Diode with Forward Current 10 to 100 mA, Reverse Current 10 uA, Breakdown Voltage 100 to 120 V, Thermal Resistance 25 to 30 Degree C/W, Forward Resistance 0.8 to 1 Ohms. Tags: Surface Mount. More details for ML4620 can be seen below.