This part is a kind of semiconductor called BAT14-099.

Function of this product has Silicon Dual Schottky Diode (DBS mixer application to 12 GHz Low noise figure Medium barrier type).

Manufacturers : Siemens Semiconductor Group

Image and pinout :

Some of the text within the PDF file :

Silicon Dual Schottky Diode DBS mixer application to 12 GHz q Low noise figure q Medium barrier type q BAT 14-099 ESD: Electrostatic discharge sensitive device, observe handling precautions! Type BAT 14-099 Marking Ordering Code (tape and reel) S9 Q62702-A3461 Pin Configuration Package1) SOT-143 Maximum Ratings per Diode Parameter Reverse voltage Forward current Power dissipation, TS ≤ 55 ˚C Storage temperature range Operating temperature range Thermal Resistance Junction – ambient2) Junction – soldering point Rth JA Rth JS ≤ ≤ Symbol VR IF Ptot Tstg Top Values 4 90 100 – 55 … + 150 Unit V mA mW – 55 … + 150 ˚C 1090 930 K/W 1) 2) For detailed information see chapter Package Outlines. Package mounted on alumina 15 mm × 16.7 mm to 0.7 mm. Semiconductor Group [ ... ]

BAT14-099 PDF Datasheet Download