This part is a kind of semiconductor called 3S4YR-HSR.

Function of this product has Manual Swipe Magnetic Card Reader.

Manufacturers : Omron Electronics

Image and pinout :

Some of the text within the PDF file :

® Manual Swipe Magnetic Card Reader Economical, Manually Operated Card Reader Compact, rugged design s Wide operating temperature range s Stable operation with card swipe speed within a range of 10 to 150 cm/second s 3S4YR-HSR Choose enclosed or open housing to match application s Single and double track configurations s TTL-compatible interface (clock & data) s Ordering Information Magnetic Tracks Supported (R, R/W) 1 R R R R 2 R R R R R R 3 R R R R Center JIS II IC Contact No No No No No No No No No No Interface TTL TTL TTL TTL TTL TTL TTL TTL TTL TTL Cover Yes No Yes No Yes No Yes No Yes No Cable Yes Yes Yes Yes Yes Yes [ ... ]

3S4YR-HSR PDF Datasheet Download