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aCSP/WLCSP

To service the fast growing market within PDA and cell phone, this smaller chip size is essential. In 2001, ASE licensed Ultra CSP® from Kulicke & Soffa's Flip Chip Division. ASE also provided several enhanced structures called "aCSP™" by polyimide, PBO, or thicker Cu RDL to meet various customer demands. aCSP™ is a wafer level CSP package that can be Direct Chip Attached to the PCB board without any interposer. Also, aCSP™ provides the shortest electrical path from Al pad to PCB board to enhance the electrical performance. It has been broadly used in portable devices in passives, analog and logic applications, and is extending to RF applications.


Application
Features
  • Bluetooth/Wi-Fi
  • GPS
  • FM Radio
  • Analog Devices
  • Microcontrollers/Integrated Passives
  • EEPROM
  • Power and Voltage Regulator
  • Power Amplifier
  • RF Devices
  • Cell Phones and System Boards
  • Real chip size (smallest, thinnest and lightest)
  • High density interconnection
  • High-speed data processing
  • Batch process-assembly processed in wafer form
  • Wire-bond type die can be directly switched to Acsp

Product Offering

  • aCSP: Through ball drop process
  • BWLCSP: Through ball printing/plating process

Advanced Technology under Development

  • Wafer technology: Qualification for 90 and 65nm wafer
  • Ball pitch: 300um
  • Ball size: 150um ball drop
  • Grinding: Die thickness 200um
  • Plated RDL line/width: 10/10um; 6/6um
  • Plated RDL thickness: >=7um
  • Sawing: Laser sawing



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