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40 years of HALT:What Have We
Learned?Mike Silverman
©2011 ASQ & Presentation SilvermanPresented live on Sept 12th, 2013
http://reliabilitycalendar.org/webinars/english/
ASQ Reliability Division English Webinar SeriesOne of the monthly webinars
on topics of interest to reliability engineers.
To view recorded webinar (available to ASQ Reliability Division members only) visit asq.org/reliability
To sign up for the free, and available to anyone,live webinars visit reliabilitycalendar.org/webinars
http://reliabilitycalendar.org/webinars/english/
Mike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 3 April 7, 2023 ASTR 2013 Oct 9-11, San Diego
Accelerated Stress Testing and Reliability WorkshopOctober 9-11, 2013 San Diego, CA
Accelerating Reliability into the 21st CenturyKeynote Presenter Day 1: Vice Admiral Walter MassenburgKeynote Presenter Day 2: Alain Bensoussan, Thales Avionics
Accelerating Reliability into the 21st CenturyKeynote Presenter Day 1: Vice Admiral Walter MassenburgKeynote Presenter Day 2: Alain Bensoussan, Thales Avionics
CALL FOR PRESENTATIONS: We are now Accepting Abstracts. Email to: [email protected].
Guidelines on website www.ieee-astr.org
For more details, click here to join our LinkedIn Group:IEEE/CPMT Workshop on Accelerated Stress Testing and Reliability
Mike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 4 April 7, 2023 ASTR 2013 Oct 9-11, San Diego
This is the 4th of a series of four webinars being put on by Ops A La Carte, ASTR, and ASQ Reliability DivisionEach webinar will also be presented as a full 2 hour tutorial at our ASTR Workshop Oct 9-11th, San Diego.
Abstracts for presentations are due Apr 30.www.ieee-astr.org
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 5 April 7, 2023
Introduction 5 min
Accelerated Reliability Growth Testing 45 min
Questions 10 min
Agenda
Mike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 6 April 7, 2023 ASTR 2013 Oct 9-11, San Diego
40 Years of HALT: What Have We Learned?
ByMike Silverman, CRE
Managing PartnerOps A La Carte
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 7 April 7, 2023
INTRODUCTION
HALT began 40 years ago with a simple idea of testing beyond specifications in order to better understand design margins.
Over the past 40 years, thousands of engineers around the world have been exposed to the concepts of HALT and have tried the techniques.
What have we learned in the past 40 Years?
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 8 April 7, 2023
INTRODUCTION
In this seminar, we will cover the following areas:1) What is HALT and What is Not HALT2) Basics of HALT3) Links between HALT and Design for Reliability4) New advances in HALT methodology5) What % of companies are doing HALT6) What lies in the future for HALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 9 April 7, 2023
1) What is HALT and What is Not HALT 2) Basics of HALT 3) Links between HALT and Design for Reliability 4) New advances in equipment 5) What % of companies are doing HALT 6) What lies in the future for HALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 10 April 7, 2023
WHAT IS HALT?
HALT: Done to ruggedize the product and obtain large margins over the expected in-use conditions. Uses all stresses which can cause relevant failures. Stresses are not limited to field levels or stresses.- “Accelerated Reliability Engineering: HALT and HASS”, Gregg Hobbs
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 11 April 7, 2023
WHAT IS HALT?
HALT: A design technique used to discover product weaknesses and improve design margins. The intent is to systematically subject a product to stress stimuli well beyond the expected field environments in order to determine and expand the operating and destruct limits of your product.- 50 Ways to Improve Your Product Reliability, Mike Silverman
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 12 April 7, 2023
WHAT IS HALT?
What do these definitions have in common: Greatly accelerated process Develop margins between spec and performance Not just measuring margins but improving margins Separating relevant from non-relevant failures Starts early in design Stresses are not limited to field stresses Stresses are not limited to temperature and vibration Power on and effective detection/monitoring Combined Environment Baby swimming (make more robust to real life later)
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 13 April 7, 2023
WHAT IS NOT HALT?
What are some classic HALT misconceptions: My product does not experience vibration so we can’t use it The spec for this component is 70C so we can’t go above that
in HALT We can’t drill holes in the product because it will change the
airflow We must mount it in the same direction as it will be mounted in
the field We don’t need to go above the first failure point because that is
what will fail first Run to preset levels (remember this is not a pass/fail test) Don’t stress beyond specifications Only perform HALT at system level Just perform HALT only when diags are fully ready
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 14 April 7, 2023
WHAT IS NOT HALT?
And a few more… HALT is for electronic equipment only We can’t separate out this assembly because it will change the
thermal and vibration characteristics of the product We shouldn’t defeat protection circuitry because the product
will never experience higher than this stress. Performing each individual stress is the same as combined
stresses A G is a G 15C per minute is a limit of the technology
and my favorite… you can only perform HALT in a HALT Chamber
What other ones can you think of ?
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 15 April 7, 2023
1) What is HALT and What is Not HALT 2) Basics of HALT 3) Links between HALT and Design for Reliability 4) New advances in equipment 5) What % of companies are doing HALT 6) What lies in the future for HALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 16 April 7, 2023
16
Stre
ss
Start low and step up the stress, testing the product during the stressing
BASICS OF HALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 17 April 7, 2023
17
Failure
Gradually increase stress level until a failure occurs
Stre
ss
BASICS OF HALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 18 April 7, 2023
© 2008 Ops A La Carte
18
Stre
ss
Failure
Analy
sisAnalyze the failure
BASICS OF HALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 19 April 7, 2023
© 2008 Ops A La Carte
19
Stre
ss
Failure
Analy
sisImproveMake temporary improvements
BASICS OF HALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 20 April 7, 2023
© 2008 Ops A La Carte
20
Stre
ss
Failure
Analy
sisImprove
(incr
ease
)
Increase stress and start process over
BASICS OF HALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 21 April 7, 2023
© 2008 Ops A La Carte
21
Stre
ss
Failure
Analy
sisImprove
(incr
ease
)Fundamental Technological
Limit
BASICS OF HALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 22 April 7, 2023
© 2008 Ops A La Carte
22
Classic S-N Diagram(stress vs. number of cycles)
N0
S0= Normal Stress conditions
N0= Projected Normal Life
S1
S2
N1N2
S0
BASICS OF HALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 23 April 7, 2023
© 2008 Ops A La Carte
23
Classic S-N Diagram(stress vs. number of cycles)
N0
S0= Normal Stress conditions
N0= Projected Normal Life
S1
S2
N1N2
Point at which failures become non-relevant
S0
BASICS OF HALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 24 April 7, 2023
© 2008 Ops A La Carte
24
Product Operational
Specs
Stress
Upper Oper. Limit
Upper Destruct
Limit
Lower Destruct
Limit
LowerOper. Limit
BASICS OF HALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 25 April 7, 2023
© 2008 Ops A La Carte
25
Product Operational
Specs
Stress
Upper Oper. Limit
Upper Destruct
Limit
Lower Destruct
Limit
LowerOper. Limit
This is what the product spec distribution really looks like
BASICS OF HALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 26 April 7, 2023
© 2008 Ops A La Carte
26
Product Operational
Specs
Stress
Upper Oper. Limit
Upper Destruct
Limit
Lower Destruct
Limit
LowerOper. Limit
Operating Margin
Destruct Margin
BASICS OF HALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 27 April 7, 2023
1) What is HALT and What is Not HALT 2) Basics of HALT 3) Links between HALT and Design for Reliability 4) New advances in equipment 5) What % of companies are doing HALT 6) What lies in the future for HALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 28 April 7, 2023
HALT vs. DFR
DfR is knowledge-based engineering wherein, starting with capture of requirements and leading to assured reliability, a reliability plan is designed and executed using the full skills and knowledge of the project team. The goal of DfR is to work smarter through knowledge-based tailoring of the reliability plan.
HALT is one of the tools used during a DFR program to help improve and then prove the product reliability goals. It is one of the most effective tools but is still just one of the reliability tools used.
This is often forgotten by engineers.
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 29 April 7, 2023
HALT vs. DFR
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 30 April 7, 2023
Goal
Setting
Assess-
ment
Bench-
mark
FTAFMEA
Golden
Nuggets
Component
Selection
Predict-
ions
Thermal
Analysis
Derating
Analysis
POF
DOE Tolerance
Analysis
Preventive
Mainten.
EOL
Analysis
Warranty
Analysis
Test
Plan
HALT RDT ALT HALT-AFR
Calculator
FEA Software
Reliability
RCA CLCA
Vendor
Assessmt
HASS ORT OOBA
Lessons
Learned
Warranty
Returns
Reliability
Reporting
Statistics EDA for
Obsolesc
Out-
sourcing
Metrics
Reliability
Plan
CO
NC
EP
T
PH
AS
E
DE
SIG
N
PH
AS
E
MA
NU
FA
CT
UR
ING
PH
AS
E
PR
OT
OT
YP
E P
HA
SE
Gap
Analysis
Block
Diagrams
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 31 April 7, 2023
1) What is HALT and What is Not HALT 2) Basics of HALT 3) Links between HALT and Design for Reliability 4) New advances in HALT methodology 5) What % of companies are doing HALT 6) What lies in the future for HALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 32 April 7, 2023
NEW ADVANCES IN HALT
Along with improvements in chamber technology, there have been advances in the methodology as well. Harry McLean’s HALT Calculator
To determine “Guard Band” Limits during the HALT Plan
To determine AFR after HALT Using FMEA to determine specific areas to test for Linking HALT to ALT Using HALT for software/firmware issues
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 33 April 7, 2023
There are three different approaches to this problem
1) Physics of FailureDrawback: Too many variables/Model becomes too complex
2) Weibull models/make general assumptions about acceleration factors or plotting best fit curves.
Drawbacks:a) Acceleration factors incorrect/Cannot be generalized
b) Existing models are for constant stress and not step stressing
c) Not enough HALT failures for statistically significant data
3) Model using HALT and Field DataDrawback: requires a lot of data from many different types of products in many different industries to develop an accurate model. No one had access to this data…UNTIL NOW!
There are three different approaches to this problem
1) Physics of FailureDrawback: Too many variables/Model becomes too complex
2) Weibull models/make general assumptions about acceleration factors or plotting best fit curves.
Drawbacks:a) Acceleration factors incorrect/Cannot be generalized
b) Existing models are for constant stress and not step stressing
c) Not enough HALT failures for statistically significant data
3) Model using HALT and Field DataDrawback: requires a lot of data from many different types of products in many different industries to develop an accurate model. No one had access to this data…UNTIL NOW!
NEW ADVANCES IN HALTHALT Calculator
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 34 April 7, 2023
• It is a provisional patent Excel-based mathematical model that, when provided with the appropriate HALT and product information, will accurately estimate the product’s field AFR or Actual field Failure Rate.• Three acceleration models are used, linear, exponential, and quadratic.
• The AFR Estimator has been validated on almost thirty products from diverse design environments and manufacturers.
• It is a provisional patent Excel-based mathematical model that, when provided with the appropriate HALT and product information, will accurately estimate the product’s field AFR or Actual field Failure Rate.• Three acceleration models are used, linear, exponential, and quadratic.
• The AFR Estimator has been validated on almost thirty products from diverse design environments and manufacturers.
NEW ADVANCES IN HALTHALT Calculator
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 35 April 7, 2023
Complete MTBF prediction1. Use Telcordia, MIL-HDBK-217, or equivalent
2. Parts Count is acceptable
3. Ensure if you have a high failure rate item that you research and get supplier test/field data to replace handbook data. The calculator is very sensitive to single component weaknesses in HALT. Therefore, having prediction data for individual components.
4. If you don’t have access to MTBF Prediction, use default prediction value provided in model or use built in prediction estimator (model sensitivity to prediction is relatively low so a default value is acceptable).
Complete MTBF prediction1. Use Telcordia, MIL-HDBK-217, or equivalent
2. Parts Count is acceptable
3. Ensure if you have a high failure rate item that you research and get supplier test/field data to replace handbook data. The calculator is very sensitive to single component weaknesses in HALT. Therefore, having prediction data for individual components.
4. If you don’t have access to MTBF Prediction, use default prediction value provided in model or use built in prediction estimator (model sensitivity to prediction is relatively low so a default value is acceptable).
To Maximize Use of the ModelTo Maximize Use of the Model
NEW ADVANCES IN HALTHALT Calculator
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 36 April 7, 2023
Complete HALT using the following guidelines:
1. Sample size of at least three, preferably four units. Model can accommodate 1 to 6.
Realize that HALT sample sizes of three or less will dramatically affect the ability to detect product defects and hence, the statistical confidence is likewise, impacted.
2. Perform HALT at each phase of Product Development Process to expand limits as much as possible.
But use the results of your HALT later in product development when samples are more abundant. HALT early in development is a great idea but doesn’t give as good an input to the calculator.
3. Capture HALT Product Operational Response Limits.
Complete HALT using the following guidelines:
1. Sample size of at least three, preferably four units. Model can accommodate 1 to 6.
Realize that HALT sample sizes of three or less will dramatically affect the ability to detect product defects and hence, the statistical confidence is likewise, impacted.
2. Perform HALT at each phase of Product Development Process to expand limits as much as possible.
But use the results of your HALT later in product development when samples are more abundant. HALT early in development is a great idea but doesn’t give as good an input to the calculator.
3. Capture HALT Product Operational Response Limits.
NEW ADVANCES IN HALTHALT Calculator
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 37 April 7, 2023
Guard Band
Design
New End Use
Prod Spec
End Use
Guard Band, Spec & End UseGuard Band, Spec & End Use
NEW ADVANCES IN HALTHALT Calculator
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 38 April 7, 2023
• The model has not been validated on mechanical designs.
• The estimate is as good as the test protocol used in HALT and other reliability tests.
• HALT does not capture every possible design defect, i.e., humidity related issues, field operation beyond Guard Band limits, some wear-out mechanisms, etc.
Limitations of the ModelLimitations of the Model
NEW ADVANCES IN HALTHALT Calculator
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 39 April 7, 2023
PublishedSpec, C
Level Application Guard Band, C
0 to +40 1 Consumer -30 to +80
0 to +50 2 Hi-end Consumer -30 to +100
-10 to +50 3 Hi Performance -40 to +110
-20 to +50 4 Critical Application
-50 to +110
-25 to +65 5 Sheltered -50 to +110
-40 to +85 6 All Outdoor -65 to +110
Product Type & Guard BandProduct Type & Guard BandProduct Environment & LevelProduct Environment & Level
NEW ADVANCES IN HALTHALT Calculator
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 40 April 7, 2023
40
NEW ADVANCES IN HALTHALT Calculator
Actual Field Failure Rate Estimate - % of Failures/Year
Input MatrixCalculated MTBF (in Hrs) = 100,000
Product Thermal (Hot in °C) = 110Product Thermal (Cold in °C) = -80Product Vibration (in Grms) = 25
Prod Published Spec Level (see below) = 2Number of HALT Samples = 6
Field Duty Cycle (in Percentage) = 80Confidence = 1
Steady State AFR, % (HALT Only) = 0.30Steady State Field MTBF, Hrs (HALT Only) = 2,893,373
Lower % HALT Confidence Limit = 1,829,861Upper % HALT Confidence Limit = 4,682,531
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 41 April 7, 2023
Along with improvements in chamber technology, there have been advances in the methodology as well. Harry McLean’s HALT Calculator
To determine “must meet” margins during the HALT Plan
To determine AFR after HALT Using FMEA to determine specific areas to test for Linking HALT to ALT
NEW ADVANCES IN HALTUse of FMEA
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 42 April 7, 2023
IEC 60601 3rd Edition mandates that you must understand your product risks before you can develop a test plan
This is especially true of HALT Understanding risks will help determine
What stresses to apply? What are the limits to technology? What test routines are needed to detect? Are there any prognostics that will indicate failures
before the test routines pick up a hard failure?
NEW ADVANCES IN HALTUse of FMEA
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 43 April 7, 2023
Along with improvements in chamber technology, there have been advances in the methodology as well. Harry McLean’s HALT Calculator
To determine “must meet” margins during the HALT Plan
To determine AFR after HALT Using FMEA to determine specific areas to test for Linking HALT to ALT
NEW ADVANCES IN HALTHALT vs. ALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 44 April 7, 2023
HALT cannot find all types of failures Mechanical wear failures Other long term degradations (UV, corrosion, etc) Failures due to process variations
NEW ADVANCES IN HALTHALT vs. ALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 45 April 7, 2023
An Accelerated Life Test (ALT) is the process of determining the reliability of a product in a short period of time by accelerating the use environment.
ALT is also good for finding dominant failure mechanisms.
ALT is usually performed on individual assemblies rather than full systems.
ALT is also frequently used when there is a wear-out mechanism involved.
NEW ADVANCES IN HALTHALT vs. ALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 46 April 7, 2023
Advantages of ALTInstead of stepping up to failure, we will pick a level that we know the product will survive at (within relevant failure area) and then run at this level until failure.This will characterize wear-out mechanisms
NEW ADVANCES IN HALTHALT vs. ALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 47 April 7, 2023
One key advantage of ALT over HALT is when we need to know the life of the product.
In HALT, we don’t concern ourselves with this much because we are more interested in making the product as reliable as we can, and measuring the amount of reliability is not as important.
However, with mechanical items that wear over time, it is very important to know the life of the product as accurately as possible.
NEW ADVANCES IN HALTHALT vs. ALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 48 April 7, 2023
Another advantage is that we often do not need any environmental equipment. Benchtop testing is often adequate.
NEW ADVANCES IN HALTHALT vs. ALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 49 April 7, 2023
FAILURE TESTING
HALT
OBJECTIVES1. Root Cause Analysis2. Corrective Action Identification3. Design Robustness Determination
TESTING REQUIREMENTS1. Detailed Product Knowledge2. Engineering Experience
ALT
OBJECTIVES1. Reliability Evaluation (e.g. Failure Rates)2. Dominant Failure Mechanisms Identification
TESTING REQUIREMENTS1. Detailed Parameters
(a) Test Length(b) Number of Samples(c) Confidence/ Accuracy(d) Acceleration Factors(e) Test Environment
2. Test Metrology & Factors(a) 4:2:1Procedure Or Other(b) Costs
ANALYTICAL MODELS1. Weibull Distribution2. Arrhenius3. Coffin-Manson4. Norris-Lanzberg
NEW ADVANCES IN HALTHALT vs. ALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 50 April 7, 2023
Cell Phone
Fan
Hard Drive
Infusion Pump
MedicalCabinet
Robot
These pictures are samples of products we have tested. These are not the actual products to protect the proprietary nature of the products we test.
Automotive Electronics
NEW ADVANCES IN HALTHALT vs. ALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 51 April 7, 2023
When wear-out is a dominant failure mechanism, we must be able to predict or characterize this wear-out mechanism to assure that it occurs outside customer expectations and outside the warranty period.
ALT is an excellent method for doing this
NEW ADVANCES IN HALTHALT vs. ALT - Summary
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 52 April 7, 2023
1) What is HALT and What is Not HALT 2) Basics of HALT 3) Links between HALT and Design for Reliability 4) New advances in equipment 5) What % of companies are doing HALT 6) What lies in the future for HALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 53 April 7, 2023
What percentage of companies use the HALT methodology? I estimate about 50% of all companies in the US
have some form of reliability program. I estimate about 50% of the companies that have
some form of reliability program are doing HALT. This is based on projects we have worked with in
the past 3 years (about 750 clients). Of course there are numerous companies that have no formal reliability program.
This is up from 5% in 1995.
WHO IS USING HALT ?
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 54 April 7, 2023
1) What is HALT and What is Not HALT 2) Basics of HALT 3) Links between HALT and Design for Reliability 4) New advances in equipment 5) What % of companies are doing HALT 6) What lies in the future for HALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 55 April 7, 2023
The number of companies performing HALT will continue to rise as more labs obtain HALT equipment
The need for more education will continue to increase Standards/guidance docs will gain more importance as
more companies and labs are doing HALT, many incorrectly.
Chambers will need to provide stresses in addition to temperature and vibration to keep up with the physics of the failures (especially due to smaller packages and MEMs devices).
Move away from people and move to process HALT as acronym will fade away Less HALT and more emphasis on DFR including
HALT
FUTURE OF HALT
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 56 April 7, 2023
CONCLUSION
In this presentation we took you through 40 years of HALT showed you advances that have been made pointed out areas where improvements are
still needed
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 57 April 7, 2023
THANKS!
QUESTIONS?
ANY QUESTIONS?
ASTR 2013 Oct 9-11, San DiegoMike Silverman, Ops A La Carte40 Years of HALT: What Have We Learned, Page 58 April 7, 2023
Mike Silverman
Ops A La Carte
Managing Partnerwww.opsalacarte.com
(408) 472-3889
Confidence in Reliability
CONTACT INFO