March, 2008 David E. Swenson ESD Association

Transcription

1 March, 2008 David E. Swenson ESD Association

2 ESD Association Introduction, Advancements and Educational Opportunities Presented by: David E. Swenson ESD Association President 2008

3 Why is ESD Still Important? Devices with increased ESD sensitivity are arriving at Electronics manufacturing companies now Automated processing replacing people shift from Human Body Model to Charged Device Model and Machine Model concerns Manufacturing process capability needs to keep pace with changes in device susceptibility to ESD The disk drive industry has had to deal with increased ESD susceptibility for years need to keep pace with technology advances and reduction in overall cost

4 Changes in Device Performance To achieve the performance and density specifications required by industry, many types of electronic devices are becoming more sensitive to ESD The current trend, which is expected to continue, is to increase circuit performance at the expense of ESD protection This is especially the case for RF circuit applications And, already well known in the disk drive industry

5 ESD Technology Road Map Prediction in device sensitivity by senior device designers at IBM, Texas Instruments and Intel Corporations Increases in device sensitivity are here now, particularly for RF components Road Map already assumes the increase in magneto-resistive head ESD sensitivity

6 Device Sensitivity Roadmap CMOS HBM (Min and Max Levels) HBM Volts Copyright 2005 ESD Association Year 2005 level 300 volts 2010 level 100 volts

7 Device Sensitivity Roadmap Copyright 2005 ESD Association 2005 level 100 volts 2010 level 50 volts

8 Device Sensitivity Roadmap Copyright 2005 ESD Association 2005 level 30 volts 2010 level 10 volts

9 ESD Damage! ESD Latch-up ESD EOS ESD ESD ESD damage to the IC s can occur in different failure modes from slight to severe

10 EOS & ESD Damage

11 Factory Issues Determine the process capability What level of device ESD sensitivity can the process handle? What process areas are suspect? Can you determine fall-out from ESD? Is it possible to verify that the ESD controls are functioning correctly? What are the appropriate measurement tools?

12 Factory Considerations - Personnel Relatively simple and proven methodology to establish the minimum requirements for personnel ANSI/ESD S20.20, JESD 625A and IEC all call for <35 MΩ for personnel (100 V HBM) IDEMA <10 MΩ (10 volts HBM) Fairly easy to monitor these requirements Daily (minimum) wrist strap and footwear checks Constant monitoring in sensitive applications Regular floor maintenance

13 Wrist Strap System Resistance Test Wrist Strap #304 Stainless Steel Electrode Positive Lead Ground Lead

14 Testing Shoe Grounder while worn

15 ESD Association ESD STM Floor Materials and Footwear Resistance Measurement in Combination with a Person Stainless steel, brass or copper electrode.

16 ESD Association ESD STM Floor Materials and Footwear Voltage Measurement in Combination with a Person Recording Device Charge Plate Monitor Stainless steel, brass or copper electrode. (or wrist strap can be used. CHARGE PLATE MONITOR Voltage Adjust Plate Controls

17 Voltage Vs. R TG (Wrist Strap) IDEMA Level General factory level

18 Person Walking across various surfaces

19 Person Walking good example

20 Factory Automation adds issues A need exists to measure charge generation, charge accumulation and ESD inside equipment - What is happening inside the tool fixture assembly line? Goal is to qualify equipment in a similar way as has been done for personnel in manual operations - Quantify the electrostatic levels inside the equipment to help establish process capability

21 Machine Model Concerns Make sure that all the metal surfaces that can come into contact with ESD sensitive devices are grounded, all the time!!! Need to make resistance measurements with metal parts in motion conveyors, belts, slides to verify that all metal parts are electrically bonded and ultimately attached to ground

22 Field Induced Charged Device Model Reduce electrical fields from the process essential insulators ESD sensitive devices grounded in the presence of an electrical field will charge and discharge perhaps multiple times

23 Workstation Monitoring E-Field measurements of a manual workstation installing heat-sinks on a PC Board. Large pulses when empty plastic tray removed, 1 meter away from work area

24 Workstation E-field Plastic Tray Removal Plastic tray E-field increases as Heat Sinks are removed from tray pockets New Sensors are in development with extreme sensitivity

25 Induced Voltage (Experimental Data) V O S20.20 Recommendation L T S

26 Electrical Field Considerations in Disk Drive Industry Maximum E-field within 30 cm of any sensitive process: 500 Volts Not a simple requirement Requires great care to eliminate non-essential insulators Use of properly applied ionization

27 Impact of E-Field of 500 Volts at 1 inch at various distance and sizes Various Size Plates Charged from 500 V Power Supply at Various Distances Field Strength Volts@inch ,000 V/m Field Mill Measurement 20,000 V/m 12,000 V/m Plates in Inches Distance

28 Measuring Induction Inside Process Equipment Industry is developing tools and equipment for process verification Monitor induced voltage levels inside process equipment (Field Induced CDM) Locate areas within equipment where discharges occur Help spot MM issues

29 49 Volts Courtesy of SH&A/Prostat Device Placement PCB Momentarily Stopped J. Kinnear, IBM Beta Test Series CDM/FIM Handlers

30 Process Monitoring Circuit Board assembly Electrical field measurement Volts/meter

31 Process Monitoring Circuit Board assembly expanded view Electrical Field Volts/Meter

32 Process Monitoring Circuit Board Assembly Part Placement Electrical Field Volts/cm

33 Transition to the Next Level Device Design and Factory personnel must prepare to handle the increased ESD sensitivity coming soon Having a better understanding of ESD control techniques will be required in the factory Knowing how to make all the required measurements will be an essential skill in the (near) future for those that must maintain an Electrostatic Protected Area This leads to a need for increased education

34 ESD Association - Professional Education ESD Program Manager Certification 10 Tutorials in the education curriculum Comprehensive 8 hour exam ESD Device Design Professional 12 Tutorials in the education curriculum Comprehensive 8 hour exam

35 inarte The ESD Association has a renewed agreement with inarte to assist with their certification programs ESD Association tutorials are the main training materials for the ESD Technician and ESD Engineer Certifications offered by inarte

36 Certified Program Manager Tutorial Curriculum ESD Basics (full day) How To s of In-Plant ESD Auditing and Evaluation Measurements (full day) ESD Program Development and Assessment (2-days) Device Technology and Failure Analysis Overview Electrostatic Calculations for the ESD Engineer Cleanroom considerations for the Program Manager System Level ESD/EMI: Testing to IEC and other Standards Air Ionization: Issues and Answers ESD Standards Overview for the Program Manager Packaging Principles for the Program Manager

37 Additional Class Relevant to the Disk Drive Industry ESD Control for Extremely Sensitive Class 0 Devices

38 Certified Program Manager Comprehensive 8 hour exam covering all aspects/subjects taught in Tutorial program Essay questions ~40% of score Graded by two independent Program Manager Council Members Must pass each section with a minimum grade of 50%. Must have an overall average of >70%

39 Certified Program Manager Current inarte Engineers may take test without taking Tutorials Comments received: Difficult test Good test of ESD Control knowledge Much harder than the inarte test Command of English (reading and writing) a must for essay questions

40 ESD Device Design Professional Tutorial Curriculum ESD On-chip Protection in Advanced Technologies System Level ESD/EMI: Testing to IEC and other Standards On-Chip ESD Protection for RF Technologies Spice-Based ESD Protection Design Utilizing Diodes and Active MOSFER Rail Clamp Circuits EOS/ESD Failure Models and Mechanisms Circuit Modeling and Simulation for On-Chip Protection Latch-up Physics and Design Device Testing-Component Level HBM,CDM,MM,& TLP Impact of CMOS Technology Scaling for ESD CDM Design and Characterization Troubleshooting On-Chip ESD Failures Transmission Line Pulse Measurements: Parametric Analyzer for ESD On-Chip Protection

41 ESD Device Design Professional The first examination for DD Certification was offered at the 2007 (EOS/ESD Symposium)

42 Tutorial Offering The full slate of Tutorials are offered each year at the EOS/ESD Symposium September 7-12, 2008, Westin La Paloma Resort and Convention Center, Tucson, AZ Selected Tutorials offered throughout the year at ESD Association Standards/Planning meetings and co-sponsored by Local Chapters See 2008 schedule at

43 International Tutorials The ESD Association is developing plans to offer Tutorials throughout the world High interest in Asia and Europe Working on logistics

44 Wrap-up ESD Sensitivity will increase dramatically over the next couple years for all electronic parts In-plant processes must improve to avoid costly losses Education of employees involved in the ESD Control Program is gaining in importance (again) The Device Design community offers a new educational package

45 Thank you for allowing me to deliver this message today