This part is a kind of semiconductor called BD429.

Function of this product has Line Driver.

Manufacturers : DEI

Image and pinout :

Some of the text within the PDF file :

Device Engineering Incorporated 430 S. Rockford Dr. Tempe, AZ 85281 Phone: (480) 303-0822 Fax: (480) 303-0824 E-mail: admin@deiaz.com BD429 ARINC 429/RS-422 Line Driver Integrated Circuit Features: • • • • • • • • • • • • ARINC 429 Line Driver for HI speed (100 kHz) and LOW speed (12.5 kHz) data rates Pin for Pin replacement part for industry standard ARINC 429 Line Drivers Available in a 16 Pin SOIC (WB), 16 Pin CERDIP and 28L PLCC Low EMI RS-422 line driver mode for data rates up to 100 kHz Adjustable slew rates via two external capacitors Inputs are TTL and CMOS compatible Low quiescent power of 125mW (typical) Programmable output differential range via VREF pin Outputs are fused for failsafe overvoltage protection Drives full ARINC load o [ ... ]

BD429 PDF Datasheet Download