Example WCCA Report Download


Simulating Stability and EMC/ESD Transients for Automotive

Power Supplies with PSPICE

Automotive Power Supply WCCA
Stability and EMC/ESD Transient (ISO7637, FMC1278,etc.) analysis is a challenging endeavor. Most people severely underestimate the effort required. First the circuit must be modeled properly. This is a challenge because parts must be modeled AND toleranced. A nominal model is not enough. And most vendor supplied models are deficient in some way. They should be checked, correlated, and adjusted. Then you must run the AC analysis to confirm the supply meets stability. After that comes the pain. A series of EMC and ESD transients must be simulated, and parts checked for stress during the analysis.


This sample report shows you what you are in for and why you need AEi System’s help to perform this analysis correctly.


Download Sample Automotive EMC/Stability Report
Automotive WCCA Example Report - Simulating Stability and EMC/ESD Transients for Automotive Power Supplies - LM25116 Stability and EMC-ESD Transient Example


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Worst Case Happens Every Day

Many don’t believe that the tolerance stackup is possible. That parts or circuits can be as bad as the stackup says they are. The total tolerance stackup includes Initial, temperature, aging, manufacturing and in Space, radiation tolerances. In some cases, these are largely beginning of life and in some cases, more end-of-life. But the bottom line is worst case happens every day!

The clip, filmed inside a distribution warehouse, captured the driver as he made his way down an aisle between two tall pallet racksHere’s this months light-hearted look at how out of tolerance conditions can cascade and why you need to perform WCCA.

A Video Tutorial: Your Circuit Without WCCA


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Learn about Power Integrity


Learn about SPICE Modeling


Learn about Design of Sensitive Circuits


Designing Power for Sensitive Circuits



Post #3 - The importance of SPICE part and circuit simulation models in WCCA

Why WCCA is

Challenging To Perform

Circuit models are the heart of worst-case circuit analysis (WCCA). For simulations to be valid, you must gather and vet models or create them yourself; you can't usually rely on the manufacturer's model. Your models must correlate to datasheets or test data, and then you need to add tolerances to those models. Your goal is to create an accurate model with the "proper" fidelity. Too much fidelity results in high costs, but models that are too simple or inaccurate can result in bogus outcomes. 

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Do You Need Worst Case Analysis Support?

AEi Systems performs WCCA for Space, Automotive and other applications.
If you need electrical engineering services, please contact us at 310-216-1144 or


Performing WCCA for the first time is not a trivial exercise. It is simply not for first-timers.


  • Running out time?
  • Don’t have the resources or experience to get the analysis completed on time?
  • Don’t fully understand the scope and what is expected?
  • Don’t have the models or confidence your internal resources can meet customer expectations?


If you are interested in learning how to perform WCCA, the best way to do that is work with AEi Systems on your first WCCA. The process will result in an analysis you can use as a guide for future efforts.


AEi Systems brings decades of WCCA experience to bear on finding problems in your circuitry. We highlight the worst case issues and provide the reporting auto manufacturers are looking for. We help you fix the issues we find and our WCCA passes muster with manufacturer review teams and industry standards.


     Less expensive and more cost effective than in-house resources 

  • Our full-time team of top engineers with focused backgrounds in reliability, design, WCCA, and test has all the required core competencies to perform with great efficiency.
  • We have a significant number of SPICE models already made. We have Parts Variability Databases. We have Radiation Data. Even if you have in-house resources, dealing with models and tolerances can take a significant amount of time. AEi Systems puts the money and time savings in your pocket as we do not charge extra for this valuable IP
  • Analysis is all we do; Keep your in-house designers doing what they do best.

    Faster than in-house resources - ready to go 

  • Our proprietary software tools, library of proven SPICE models, and our 20 years of analytical engineering experience keep your team ahead of schedule
  • No bias - We introduce "checks and balances" to your design process/SDRLs

How can we help you?  Contact us for more specific information or a no-obligation quotation.

 AEi Systems, LLC -  USA
+1-310-216-1144 ▪

2657 Windmill Pkwy Suite 1100 , Henderson, NV, 89074

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