The MBP25D from Massachusetts Bay Technologies is a RF PIN Diode with Reverse Voltage 25 V, Series Resistance 0.40 to 0.60 Ohms, Thermal Resistance 35 Degree/W, Capacitance 0.25 pF, Operating Temperature -55 to 150 Degree C. Tags: Chip. More details for MBP25D can be seen below.