There is greater flexibility with the 8-SOIC (0.154, 3.90mm Width) package.Bulk represents the packaging method.Surface Mount is the way in which it is mounted.Mosfet driver contains a variety of related parts under Mosfet drivers base part number IX*611.You mount it with Surface Mount.
IXK611S1 Features
Embedded in the Bulk package
IXK611S1 Applications
There are a lot of IXYS IXK611S1 gate drivers applications.
UPS systems
Telecom switch mode power supplies
Head-up and Head mounted displays
High power buffers
Industrial Power Supplies
High-speed communications
Smart Phones
LCD/LCoS/DLP portable and embedded pico projectors