This part is a kind of semiconductor called BAR28.

Function of this product has SMALL SIGNAL SCHOTTKY DIODE.

Manufacturers : STMicroelectronics

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Some of the text within the PDF file :

BAR 28 SMALL SIGNAL SCHOTTKY DIODE DESCRIPTION Metal to silicon junction diode featuring high breakdown, low turn-on voltage and ultrafast switching. Primarly intended for high level UHF/VHF detection and pulse application with broad dynamic range. Matched batches are available on request. ABSOLUTE RATINGS (limiting values) Symbol VRRM IF IFSM Tstg Tj TL Parameter Repetitive Peak Reverse Voltage Forward Continuous Current* Surge non Repetitive Forward Current* Storage and Junction Temperature Range Maximum Lead Temperature for Soldering during 10s at 4mm from Case Ta = 25 °C tp ≤ 1s DO 35 (Glass) Value 70 15 50 - 65 to 200 - 65 to 200 230 Unit V mA mA °C °C THERMAL RESISTANCE Symbol Rth(j-a) Junction-ambient* Test Conditions Value 400 Unit °C/W ELECTRICAL CHARACTERISTICS STATIC [ ... ]

BAR28 PDF Datasheet Download