The MBP100A from Massachusetts Bay Technologies is a RF PIN Diode with Reverse Voltage 100 V, Series Resistance 1.2 to 1.9 Ohms, Thermal Resistance 90 Degree/W, Capacitance 0.03 pF, Operating Temperature -55 to 150 Degree C. Tags: Chip. More details for MBP100A can be seen below.