A Tape & Reel (TR) case is used to deliver the Voltage Regulated IC. As you can see, the IC chip has 4 terminations. It is important to note that this device has a FIXED POSITIVE SINGLE OUTPUT STANDARD REGULATOR regulator type.
XC6504A1919R-G Features
XC6504A1919R-G Applications
There are a lot of Torex Semiconductor Ltd XC6504A1919R-G Linear Voltage Regulators applications.