A Tape & Reel (TR) case is used to deliver the Voltage Regulated IC. As you can see, the IC chip has 4 terminations. There are 4 pins in total in this voltage regulator IC. It is important to note that this device has a FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR regulator type.
RP109L361B-TR Features
RP109L361B-TR Applications
There are a lot of RICOH Electronic Devices Co., LTD. RP109L361B-TR Linear Voltage Regulators applications.