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CSP Ultra CSP®
 

Product Overview

 
Smaller sized, chips are essential to service the fast growing PDA and cell phone markets. In 2001, ASE licensed the Ultra CSP® from Flip Chip International. Ultra CSP® is a wafer level CSP package that can be Direct Chip Attached to the PCB board without any interposer. Also, Ultra CSP® provides the shortest electrical path from AI pad to PCB board to enhance the electrical performance. It has been broadly used in portable devices in passive, analog logic, and RF applications.


Application
 
Applications of Ultra CSP® include analog devices, microcontrollers, integrated passives, EEPROM, power and voltage requlator, power amplifier and RF devices. The end applications will be used in cell phones, PDAS and system boards.


Features

 
Real chip size (smallest, thinnest and lightest)
High density interconnection
High-speed data processing
Batch process-assembly, processed in wafer form
Wire-bond die type can be directly switched to Ultra CSP®


Reliability
 
 



Design Rule
 
Die thickness 0.33~0.73 mm
Al pad pitch 90 um min.
Redistribution 37 um (25 um line/12 um space)
Ball pad pitch 0.4 mm min
Solder ball diameter 0.25 mm min
Laser marking 0.3 mmx0.2 mm (Font heightxFont pitch)
(1mm=39.37mil; 1mil=25.4um)


Package Offering

 

  (For 6" and 8" wafer)
 



Material
 
Dielectric Layer : BCB; PI ( for redistribution )
UBM: Al/ NiV/ Cu; Ti/ NiV/ Cu
Solder ball: Eutectic Pb/Sn; leadfree Sn/ Ag/ Cu
Flux: Water soluble flux, Polymer collar


Standard Process
 
First dielectric layer coating/ exposure/ developing
Runner sputter deposition
Runner photolithography
Runner metal etch
Second dielectric layer coating/ exposure/ developing
UBM Sputter deposition
UBM photolithography
USB metal etch
Wafer grinding (Optional)
Wafer laser marking (Optional)
Wafer ball mounting/ Polymer Collar (Optional)
Wafer testing
Wafer sawing
2D Inspection (100%)
Die Sorting (Tape & Reel; Waffle Pack)
Final Inspection
Packing


Packing & Shipping
 
Wafer box 6" and 8"
Waffle pack 2", 3"
Tape & reel Lock reel : 7” , 13” / Tape width : 8 mm, 12 mm, 16 mm



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