The MBP200B from Massachusetts Bay Technologies is a RF PIN Diode with Reverse Voltage 200 V, Series Resistance 1.2 to 2.2 Ohms, Thermal Resistance 80 Degree/W, Capacitance 0.07 pF, Operating Temperature -55 to 150 Degree C. Tags: Chip. More details for MBP200B can be seen below.