The MBP100B from Massachusetts Bay Technologies is a RF PIN Diode with Reverse Voltage 100 V, Series Resistance 0.9 to 1.5 Ohms, Thermal Resistance 80 Degree/W, Capacitance 0.07 pF, Operating Temperature -55 to 150 Degree C. Tags: Chip. More details for MBP100B can be seen below.