The SOIC package is used for saving board space. LED drivers with this design have 4 outputs.There are 8 terminations that are designed to operate with it.The configuration of the board is built around 8 pins.In addition, its characteristics are classified into Display Drivers.
PCA9553D/01-T Features
Available in the SOIC package
PCA9553D/01-T Applications
There are a lot of NXP Semiconductors / Freescale PCA9553D/01-T LED Driver ICs applications.