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▲'''''Sherlock Automated Design Analysis™''''' is a software tool developed by DfR Solutions<ref>Military Aerospace Electronics,"DfR Solutions launches Sherlock automated design analysis software", www.militaryaerospace.com, published 2011-04-04, retrieved 2011-10-24</ref><ref>SMT iconnect007, "DfR Solutions Launches Sherlock",www.ems007.com, published 2011-10-06,retrieved 2011-10-24</ref> for analyzing, grading, and certifying the expected reliability of products at the [[printed circuit board|circuit card assembly]] level. The software is designed for use by design and [[reliability engineering|reliability engineers]] and managers in the electronics industry. Because of the modularity and broad use of electronics, Sherlock has applicability across industries such as [[automotive industry|automotive]], [[alternative energy]], [[electronic component|components]], [[consumer electronics]], [[contract manufacturer|contract manufacturing]], data and [[telecommunication]]s, [[power electronics|industrial/power]], medical, military/[[avionics]]/[[space industry|space]], and portables.
==Approach==
Users upload either a complete design package, like [[ODB++]] or IPC-2581,<ref>{{cite web |url=http://www.ipc2581.com/ |title=Home |website=ipc2581.com}}</ref>
Sherlock incorporates stresses from a variety of environments into its physics-based prediction algorithms, including elevated temperature, thermal cycling, vibrations (random and harmonic), mechanical shock and electrical stresses (voltage, current, power). Sherlock then performs several different types of reliability analysis and provides the useful (constant failure rate) and wear out (increasing failure rate) portions of the life curve for each mechanism-component combination. The specific mechanisms that are evaluated and predicted include low-cycle [[solder fatigue]] due to thermal cycling, high-cycle [[solder fatigue]] due to [[vibration]], solder cracking/component cracking/[[pad cratering]] due to [[shock (mechanics)|mechanical shock]] or excessive flexure, lead fatigue, [[wire bonding|wire bond fatigue]], [[Via (electronics)|via]] fatigue, [[electromigration]], time dependent dielectric breakdown, [[hot-carrier injection]], and negative bias temperature instability. Published research has indicated that the [[physics of failure]]-based predictions are highly accurate<ref>Hillman, Craig, Nathan Blattau, and Matt Lacy. "Predicting Fatigue of Solder Joints Subjected to High Number of Power Cycles." IPC APEX (2014).</ref> and are now used to validate other techniques.<ref>Bhavsar, Nilesh R., H. P. Shinde, and Mahesh Bhat. "Determination of Mechanical Properties of PCB." Ijmer journal 2.4.</ref>▼
[[File:Sherlock map showing strain expected during impact across the PCBA.png|thumb|right|200px|alt=Sherlock map showing strain expected during impact across the PCBA]]▼
These individual life curves are then summed to provide a physics-based reliability curve for the overall product. Sherlock also provides design rule checks (DRC) for board-level design (schematic and layout) and an overall reliability score. The reliability scoring, which is provided for the overall products – as well as individual scores and commentary for each area of analysis is used when physics-based quantitative predictions are not possible. The analysis is delivered both in PDF and HTML format. Depending on the types of analysis run and the data entered to create the analysis, reports can run between 20 and over 200 pages in length.▼
The semiconductor module is in compliance with SAE ARP 6338<ref>Process for Assessment and Mitigation of Early Wearout of Life-limited Microcircuits, http://standards.sae.org/arp6338/</ref> and is being considered as a replacement to traditional empirical reliability prediction methods (MIL-HDBK-217,<ref>{{cite web|url =http://assist.daps.dla.mil/quicksearch/basic_profile.cfm?ident_number=53939|title =MIL-HDBK-217F. Military Handbook – Reliability Prediction of Electronic Equipment. Department of Defense, 1991|accessdate =2007-11-17|url-status =dead|archiveurl =https://web.archive.org/web/20070311233011/http://assist.daps.dla.mil/quicksearch/basic_profile.cfm?ident_number=53939|archivedate =2007-03-11}}</ref> Telcordia SR-332, [[Fides (reliability)|FIDES]], and Siemens SN29500) in predicting the [[Reliability (semiconductor)|reliability of semiconductor devices]].
▲Sherlock then performs several different types of reliability analysis and provides the useful (constant failure rate) and wear out (increasing failure rate) portions of the life curve for each mechanism-component combination. The specific mechanisms that are evaluated and predicted include low-cycle [[solder fatigue]] due to thermal cycling, high-cycle [[solder fatigue]] due to [[vibration]], solder cracking/component cracking/[[pad cratering]] due to [[shock (mechanics)|mechanical shock]] or excessive flexure, lead fatigue, [[wire bonding|wire bond fatigue]], [[Via (electronics)|via]] fatigue, [[electromigration]], time dependent dielectric breakdown, [[hot-carrier injection]], and negative bias temperature instability. Published research has indicated that the [[physics of failure]]-based predictions are highly accurate<ref>Hillman, Craig, Nathan Blattau, and Matt Lacy. "Predicting Fatigue of Solder Joints Subjected to High Number of Power Cycles." IPC APEX (2014).</ref> and are now used to validate other techniques.<ref>Bhavsar, Nilesh R., H. P. Shinde, and Mahesh Bhat. "Determination of Mechanical Properties of PCB." Ijmer journal 2.4.</ref>
▲These individual life curves are then summed to provide a physics-based reliability curve for the overall product. Sherlock also provides design rule checks (DRC) for board-level design (schematic and layout) and an overall reliability score. The reliability scoring, which is provided for the overall products – as well as individual scores and commentary for each area of analysis is used when physics-based quantitative predictions are not possible. The analysis is delivered both in PDF and HTML format. Depending on the types of analysis run and the data entered to create the analysis, reports can run between 20 and over 200 pages in length.
▲The graphical interface allows users to examine results, make iterations, and pre-perform analyses as necessary. The software does not allow the user to make permanent changes to the electronic design. This activity takes place within the original EDA or [[CAD software]]. This limitation allows a broader range of users to engage with the software and evaluate design robustness and reliability. Sherlock is also compatible with [[Abaqus]], [[Ansys]], and [[Siemens NX]].
==Outputs==
Sherlock Automated Design
* A reliability score – benchmarks the risk of the design compared to industry best practices
* Predicted performance over time – allows product teams to project the product performance over its lifecycle
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* A histogram – groups parts by degree of risk
* Design recommendations –provide solutions to identified problems for rapid resolution
▲[[File:Life curves.png|250px|Life curves]][[File:Sherlock map showing strain expected during impact across the PCBA.png|
Sherlock Automated Design
* Version 3.0 - July 2013
* Version 3.1 - January 2014
* Version 3.2 - October 2014
* Version 4.0 - April 2015
* Version 4.1 - July 2015
* Version 4.2 - February 2016
* Version 5.0 - July 2016
* Version 5.1 - January 2017
* Version 5.2 - April 2017
* Version 5.3 - September 2017
* Version 2020R1 - January 2020
* Version 2020R2 - June 2020
==Market acceptance==
A company has reported requiring suppliers use Sherlock to reduce risk and help accelerate design validation and product verification.<ref>M. Wagner and V. Nalla, Customer/Supplier Collaborative Accelerated Life Testing: Benefits and Considerations, International Applied Reliability Symposium, June 2014, Indianapolis, http://www.arsymposium.org/2014/abstracts/blue_s12.htm</ref>
▲==Version History==
▲Sherlock Automated Design Analysis™ Version 1.0 launched in April 2011.<ref>Military Aerospace Electronics,"DfR Solutions launches Sherlock automated design analysis software", www.militaryaerospace.com, published 2011-04-04, retrieved 2011-10-24</ref> Sherlock is Java based, web deployable, and uses a modular, open architecture which allows for expansion.
==References==
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==External links==
* [http://www.dfrsolutions.com/software DfR Solutions/Sherlock Automated Design
[[Category:Computer-aided engineering software]]
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