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SH&A Process Capability Analysis

Identify the Actual Device Sensitivities a Process is Capable of Handling

Introduction

ESD in today’s industry is a dynamic problem closely enjoined with the design and flow of the manufacturing process. Traditional ESD controls such as specially designed worksurfaces, flooring, garments, footwear, production aids, etc.  have long been methods of choice for controlling ESD.

These controls are often not chosen to address specific ESD needs of the complex manufacturing process. Rather, they are various ways to introduce ESD controls into very sensitive environments. As problems become more severe and device damage thresholds fall to new levels, more controls, sensing devices and materials are installed in hopes of reducing losses. Often, additional ESD controls are not sufficient in addressing problems related to the manufacturing Process.

Overview

This troubleshooting approach steps beyond traditional ESD control methods and focuses on a detailed method of analyzing the critical path of a process for points of charge generation and discharge. This technique defines the type(s) of ESD device failure mechanisms that may be experienced in the process and clarifies their cause and location. Properly employed, Process Capability and Transitional Analysis techniques identify the actual device sensitivities a process is capable of handling in relation to device HBM, CDM, Field Induction and Machine Model failure thresholds.

Technique

Process Capability & Transitional Analysis measurements and procedures are effectively applied to the client's process from  beginning to end. These methods provide information and ESD control insight, including: 

1. The probability of device impact caused by HBM discharge is measured and calculated 
    
2. CDM related measurements are conducted and potential impact in manual and automated processes are defined
    
3. Measurement of fields using specialized techniques in selected automated handlers and other portions of the process indicate potential FIM impact 
    
4. Precision measurements designed to evaluate the process for current and potential Machine Model failures