The ML4611 from Spectrum Control is a RF PIN Diode with Forward Current 10 to 40 mA, Reverse Current 10 uA, Breakdown Voltage 40 to 60 V, Thermal Resistance 60 to 70 Degree C/W, Forward Resistance 1.3 to 1.5 Ohms. Tags: Surface Mount. More details for ML4611 can be seen below.