Test Services

Final Test

Next Generation Test Cell


In a primitive form of Final Test, a test cell is composed of a handler, a tester and a tester workstation that communicates with the handler over a GPIB, parallel or serial communications interface. Within this test cell, an operator divides his time between multiple testers, performing many tasks and, when or if time allows, checks whether any testers are running out-of-control.
Final Test Floor at STATS ChipPAC Singapore (SCS) with 10k Clean Room Environment

In contrast, STATS ChipPAC has evolved to a Next Generation Test Cell that includes an Automatic Test Cell Controller and a Tester Utilization Tracking System connected to the communications interface between tester and handler that monitors all the activity between tester and handler (see photo below).



Real-Time Monitoring and Control

The Tester Utilization Tracking System automatically captures the actual, real-time tester utilization where productive time is actual test time + actual index time and all other time is a category of waste. Utilization trends are displayed on a utilization monitor next to the tester workstation.

At the same time, the Automatic Test Cell Controller is continuously monitoring the good yield, the yield variation between test sites and the failure rates for all hard and soft bins looking for pre-defined out-of-control events. When it detects an out-of-control event, the Auto Controller automatically stops the tester and activates an alarm to immediately bring line support technicians into the test cell to fix the problem.

This Next Generation Test Cell also includes a scanner to avoid manual entry mistakes. Test hardware used in production at STATS ChipPAC is bar-coded along with the Lot ID on the Lot Traveler.

Automatic Closed Loop Process Control

This Next Generation Test Cell enables automatic closed loop process control, which STATS ChipPAC utilizes to keep test manufacturing processes under control at all times.

Handler Equipment

At the core of a Final Test cell is a test platform and a handler. The following table highlights the primary handling equipment used at Final Test in STATS ChipPAC.

Handler Type Temperature
Capability
Range Handler
Manufacturers
Models
Pick and Place Ambient to Hot   Seiko Epson Northstar series
  Synax SX series
  Delta Design Delta EDGE
  Hontech  HT9045W 
Tri-Temp   Multitest MT 9510
-60 ºC to 160 ºC Delta Design Delta Castle
  Synax SX141C
Gravity Feed Ambient to Hot   Multitest MT8, MT9 series
  MCT 3608
  Symtek 300 series
Tri-Temp   Multitest MT8, MT9 series
  Rasco SO series
  Aseco S series
Turret Ambient   SRM XD series
High Parallel Memory Test Tri-Temp   Mirae M440
High Parallel
Strip Test
Ambient   TESEC 3270-IHR
System Level Test Ambient to Hot 25 ºC to 125 ºC Chroma 3620*
  Hontech 3000

Other types of handling equipment are available at STATS ChipPAC factories to satisfy special customer requests. Contact STATS ChipPAC to request other handlers not highlighted in the table.

Small Package Handling

For package body sizes less than 3x3 mm, STATS ChipPAC recommends either a turret handling solution or a strip test solution. STATS ChipPAC’s turret handlers integrate tape and reel creating a continuous manufacturing flow from Final Test into Post Test to improve throughput.

Burn-In Services

STATS ChipPAC offers sophisticated Burn-In systems with deep vector memory for dynamic Burn-In. Vector memory enables high fault coverage during the Burn-In process. JTAG testing and boundary scan can also be performed during Burn-In.

STATS ChipPAC has established close working relationships with subcontractors whose core business is Burn-In. By extending its Burn-In capabilities to include outside Burn-In specialists, STATS ChipPAC can take advantage of proprietary technology, techniques and Burn-In patterns from these vendors to satisfy any special customer requirements.

STATS ChipPAC also provides services for design and development of Burn-In boards and vector memory patterns for dynamic Burn-In.  

 

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