This part is a kind of semiconductor called 74LVC1T45.

Function of this product has SINGLE BIT DUAL POWER SUPPLY TRANSLATING TRANSCEIVER.

Manufacturers : Diodes

Image and pinout :

Some of the text within the PDF file :

74LVC1T45 SINGLE BIT DUAL POWER SUPPLY TRANSLATING TRANSCEIVER WITH 3 STATE OUTPUTS Description The 74LVC1T45 is a single bit, dual supply transceiver with 3-state outputs suitable for transmitting a single logic bit across different voltage domains. The A input/output pin is designed to track VCCA while the B input/output tracks VCCB. This arrangement allows for universal low-voltage translation between any voltages from 1.65V to 5.5V. The Direction pin (DIR) controls the direction of the transceiver and in a logic voltage related to VCCA. When a high logic level is applied to DIR the A pin becomes an input and the B pin becomes the output. Conversely, the roles of A and B are reversed when DIR is asserted low. The 3-state feature occurs when either of the power supply voltages are zero. [ ... ]

74LVC1T45 PDF Datasheet Download