The BAP51-06W from NXP Semiconductors is a RF PIN Diode with Insertion Loss 0.19 to 0.54 dB, Isolation 12 to 17 dB, Forward Voltage 0.95 to 1.1 V, Forward Current 50 mA, Reverse Voltage 50 V. Tags: Surface Mount. More details for BAP51-06W can be seen below.