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6/6/2014 NASA Workmanship Standards 1 ESD Stress Test Models José D. Sancho.

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Presentation on theme: "6/6/2014 NASA Workmanship Standards 1 ESD Stress Test Models José D. Sancho."— Presentation transcript:

1 6/6/2014 NASA Workmanship Standards 1 ESD Stress Test Models José D. Sancho

2 6/6/2014 NASA Workmanship Standards 2 Introduction General Comments What is an ESD Sensitivity Level? How is it obtained? Why is it important to the user? Why different test models? How we can reduce ESD related failures

3 6/6/2014 NASA Workmanship Standards 3 Agenda The human body model (HBM) The machine model (MM) The charge device model (CDM) –Robotic (Real) CDM (R-CDM) –Socketed CDM (SDM) Damage differences between models Transmission Line Pulse (TLP) stress testing Reasons for CDM/TLP current emphasis Questions

4 6/6/2014 NASA Workmanship Standards 4 Overview ESD standard test models define the ESD sensitivity level of electronic parts. Their Significance to the different sensitivity levels used in industry. FA recognition of the model responsible for an ESD failure event. CDM TLP M HBM ESD Models: (differences & interrelation)

5 6/6/2014 NASA Workmanship Standards 5 The Human Body Model (HBM) Simulates an Electrostatic Discharge from the human body to a device (e.g. electronic component). Courtesy of Botron Co. Most commonly used model Best understood by operators Best controlled by Equipment and Training

6 6/6/2014 NASA Workmanship Standards 6 HBM Test Circuit Basic HBM Test Circuit HV Supply 100 Meg SW1 SW2 1.5 K 10 K-10 Meg 100 pf DUT I PS I PR 500 Courtesy of ESDA

7 6/6/2014 NASA Workmanship Standards 7 HBM Waveforms Stress Waveform Used for HBM ESD TestingHBM ANSI/ESD STM Current Waveform through a shorting wire Older waveform.

8 6/6/2014 NASA Workmanship Standards 8 Typical HBM Generated Failures 2000X100X Courtesy of JPL Scott M. Hull NASA/GSFC

9 6/6/2014 NASA Workmanship Standards 9 The Machine Model (MM) Originated in Japan Discharge from Equipment or Small Tools to a Device Simulates some ESD events in Automatic Equipment Repetitive, faster and more severe than the HBM Mostly used in the design of Automatic Handling Equipment and ESD-safe tools

10 6/6/2014 NASA Workmanship Standards 10 Original MM Circuit & Waveform HV Supply SW1 SW2 100 Meg 10 K- 10 Meg 200 pf DUT 500 nH

11 6/6/2014 NASA Workmanship Standards 11 ESDA Machine Model Circuit HV Supply SW1 SW2 100 Meg 10 K-10 Meg 200 pf DUT 500 Short I pS I pR

12 6/6/2014 NASA Workmanship Standards 12 ESDA MM Test Waveforms ANSI/ESD STM v discharge through a shorting wire400 v discharge through a 500 resistor

13 6/6/2014 NASA Workmanship Standards 13 Typical MM ESD Stress Failure Scott M. Hull NASA/GSFC

14 6/6/2014 NASA Workmanship Standards 14 The Charge Device Model (CDM) Simulates Electrostatic Charge transfer from a Device. Two sub-models are used R-CDM & SDM Test repeatability between Test-Sets has been a problem. Per ESDA Statistics, 90% of all field failures are caused by CDM ESD events. Failures are typically at the core of the Device

15 6/6/2014 NASA Workmanship Standards 15 Charge Device Model Circuits RcRc R d1 R d2 R dn L d1 L d2 L dn Sw1 RdRd LdLd CdCd RcRc Device with One Point Discharge Device with Multiple Discharge Paths C d1 C d2 C dn R c = Resistance to Ground.R d, L d, C d = Resistance, Inductance & Capacitance In the Discharge Path. DUT

16 6/6/2014 NASA Workmanship Standards 16 ESDA CDM Test Waveform ANSI/ESD STM Waveform for the verification Modules using a 3.5 GHz BW

17 6/6/2014 NASA Workmanship Standards 17 Typical CDM generated failures 4600x 8600x Courtesy of JPL

18 6/6/2014 NASA Workmanship Standards 18 Typical CDM Generated Failure Courtesy of Frederick Felt GSFC Part Analysis Lab. ESD event (~1 KV) shown at arrow after parallel Polishing

19 6/6/2014 NASA Workmanship Standards 19 Models Comparisons ESD ModelsZDZD RCRC C D ( pf)L D ( μH)Ε S ( μJ) 5 τ (ηs) P ave (W)I PS (A) V c = 200 VTyp. #Req # Typ #½CV 2 5R e C Ε/ τ eff V/R e HBM MM E CDM E ESD Models ZDZD RCRC CDCD LDLD Ε S in μ J 5 τ in η s P ave (W)I PS V c = 1000 VTyp.#Req # Typ #½CV 2 5R e CΕ/τ eff V/R e HBM ~ MM E CDM E >75015 Courtesy of ESDA

20 6/6/2014 NASA Workmanship Standards 20 Transmission Line Pulse (TLP) Used By IC Designers since 1985 to evaluate ESD protection schemes. Simulates HBM with very short pulses. Allows non-destructive & latch-up issues testing. Provides better results on a controlled simulation of the SDM.

21 6/6/2014 NASA Workmanship Standards 21 TLP Design Methodologies Current Source Time Domain Reflectometer Time Domain Transmission Time Domain Reflection and Transmission

22 6/6/2014 NASA Workmanship Standards 22 Current Source TLP ANSI/ESD SP

23 6/6/2014 NASA Workmanship Standards 23 Time Domain Reflectometer TLP ANSI/ESD SP

24 6/6/2014 NASA Workmanship Standards 24 Time Domain Transmission TLP ANSI/ESD SP

25 6/6/2014 NASA Workmanship Standards 25 TDR&T TLP ANSI/ESD SP

26 6/6/2014 NASA Workmanship Standards 26 Summary Models establish Benchmarks for ESD Sensitivity. Different Models are used under different environments. Models provide help to prevent and analyze ESD Failures Please send feedback to:

27 6/6/2014 NASA Workmanship Standards 27 Where to Get More Information WEB searches under ESD Models ESDA publications Consulting services provide Advice on tough ESD problems and Solutions.

28 6/6/2014 NASA Workmanship Standards 28 References 1. ANSI/ESD STM ESD Sensitivity Testing (HBM) 2. ANSI/ESD STM ESD Sensitivity Testing (MM) 3. ANSI/ESD STM ESD Sensitivity Testing (CDM) 4. ANSI/ESD SP ESD Sensitivity Testing (SDM) 5. ANSI/ESD SP ESD Sensitivity Testing (TPL) 6. Scott M. Hull, ESD Failures in Thin-Film Resistors NASA/Goddard Space Flight Center


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