This part is a kind of semiconductor called HCPL-7101.

Function of this product has High Speed CMOS Optocouplers.

Manufacturers : Agilent(Hewlett-Packard)

Image and pinout :

Some of the text within the PDF file :

H High Speed CMOS Optocouplers Technical Data HCPL-7100 HCPL-7101 Features • 1 µm CMOS IC Technology • Compatibility with All +5 V CMOS and TTL Logic Families • No External Components Required for Logic Interface • High Speed: 15 MBd (HCPL-7100) and 50 MBd (HCPL-7101) Guaranteed • Low Power Consumption • Safety Approvals UL 1577 (3750 Vac/1 Min) VDE 0884 (VIORM = 848 V peak) CSA • 3-State Output • 3750 Vac/1 Minute Dielectric Withstand • High Common Mode Transient Immunity Description The HCPL-7100/7101 optocoupler combines the latest CMOS IC technology, a new high-speed high-efficiency AlGaAs LED, and an optimized light coupling system to achieve outstanding performance with very low power consumption. It requires only two bypass capacitors for complete CMOS/TTL comp [ ... ]

HCPL-7101 PDF Datasheet Download