The TPS71550DCKR from Texas Instruments is a linear voltage regulator Integrated Circuit with a positive fixed 5 V output at 50 mA, 1 output, in an SC-70-5 package.
The TPS71550DCKRG4 from Texas Instruments is a positive fixed linear voltage regulator Integrated Circuit with 1 output at 5 V and 50 mA, in an SC-70-5 package.
The TPS71550TDB1 from Texas Instruments is a positive fixed linear voltage regulator Integrated Circuit with one output rated 5 V and 50 mA, supplied in die form.