This part is a kind of semiconductor called BAS16.

Function of this product has High-speed diode.

Manufacturers : Kexin

Image and pinout :

Some of the text within the PDF file :

SMD Type High-speed diode BAS16 Diodes Features Small plastic SMD package High switching speed: max. 4ns Continuous reverse voltage: max. 75 V Repetitive peak reverse voltage: max. 85 V Repetitive peak forward current: max. 500 mA. +0.12.4 -0.1 SOT-23 2.9+0.1 -0.1 0.4+0.1 -0.1 3 12 0.95+0.1 -0.1 1.9+0.1 -0.1 0-0.1 +0.10.38 -0.1 +0.10.97 -0.1 +0.11.3 -0.1 0.55 0.4 Unit: mm 0.1+0.05 -0.01 1.Base 2.Emitter 3.collector Absolute Maximum Ratings Ta = 25 Parameter Symbol Conditions repetitive peak reverse voltage VRRM Continuous reverse voltage VR Continuous forward current IF Note 1 Repetitive peak forward current IFRM square wave; Tj =25 prior to surge; Non-repetitive peak forward current IFSM t=1 s t = 1 ms t=1s Total power dissipation Ptot Tmab = 25 ; Note 1 Stor [ ... ]

BAS16 PDF Datasheet Download