The MBP70A from Massachusetts Bay Technologies is a RF PIN Diode with Reverse Voltage 70 V, Series Resistance 0.9 to 1.2 Ohms, Thermal Resistance 80 Degree/W, Capacitance 0.05 pF, Operating Temperature -55 to 150 Degree C. Tags: Chip. More details for MBP70A can be seen below.