This part is a kind of semiconductor called SMP16A.

Function of this product has (SMPxx) Transient Voltage Suppressors.

Manufacturers : Vishay Siliconix

Image and pinout :

Some of the text within the PDF file :

New Product SMP11 thru SMP36A Vishay General Semiconductor Surface Mount TRANSZORB® Transient Voltage Suppressors FEATURES • Very low profile - typical height of 1.0 mm • Ideal for automated placement • Available in uni-directional • 400 W peak pulse power capability with a 10/1000 µs waveform • Excellent clamping capability • Very fast response time • Low incremental surge resistance DO-220AA (SMP) eSMP TM Series • Meets MSL level 1, per J-STD-020 • Solder dip 260 °C, 40 s • Component in accordance to RoHS 2002/95/EC and WEEE 2002/96/EC TYPICAL APPLICATIONS Use in sensitive electronics protection against voltage transients induced by inductive load switching and lighting on ICs, MOSFET, signal lines of sensor units for consumer, computer, ind [ ... ]

SMP16A PDF Datasheet Download