This part is a kind of semiconductor called SP232A.

Function of this product has Enhanced RS-232 Line Drivers/Receivers.

Manufacturers : Exar

Image and pinout :

Some of the text within the PDF file :

SP232A Enhanced RS-232 Line Drivers/Receivers FEATURES • Operates from a Single +5V Power Supply • Meets all RS-232F and ITU V.28 Specifications • Operates with 0.1μF Ceramic Capacitors • High Data rate - 120kbps under load • Low power CMOS Operation • +/-2kV Human Body Model ESD Protection • Lead Free packaging available The SP232A is a line driver and receiver pair that meets the specifications of RS-232 and V.28 serial protocols. This device is pin-to-pin compatible with popular industry standard pinouts. The SP232A offers 120kbps data rate under load, small ceramic type 0.1μF charge pump capacitors and overall ruggedness for comercial applications. The SP232A features Exar's BiCMOS design allowing for low power operation without sacrificing performance. This device is [ ... ]

SP232A PDF Datasheet Download