fiXtress® Pro

Realistic MTBF for your electronic design

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Realistic MTBF

Incorporate component derating,
PCB self-heating and actual stresses into your calculations

Process Automation

Automate MTBF predictions and components stress analyses

Smart Data Management

Use the built-in library editor to create and manage your components library

Maximum Data Reuse

Enter data once, use it again for design updates or across different projects

No More Spreadsheets

forget about spending time managing countless spreadsheets that require constant maintenance







Our Customers


“fiXtress helps us accelerate our efforts to perform automated design reviews, electrical stress analysis and reliability prediction prior to PCB layout and manufacturing. It is both a time-saver and a productivity enhancer.”

Dr. Josh Liew

Sr. Hardware Engineer, Amazon

“With fiXtress, we went from entire days of manual checks to an effective automated process lasting just several hours. Best of all, we now can be sure of our product’s robustness.”

V&V Team leader


“I chose BQR tools over their competitors because they provide a full range of integrated reliability tools. Without the integration, much capital and time would be consumed by manual calculations.”

D.A Team Leader

Elbit Systems

“We would like to thank BQR. The schematic review, MTBF and stress analysis tools provided by BQR were very helpful. It detected several issues that could affect the functionality of the board. By detecting those issues early in the design process, we saved significant time and definitely had a return on investment…

Hagai Greenfeld

Operation Manager, Lightbits

Frequently Asked Questions

A realistic MTBF provides a closer, more precise, approximation of the expected MTBF under operational conditions. We are able to achieve a realistic MTBF prediction by incorporating component derating, PCB self-heating and components actual stresses into our calculations. 

When taking actual stress levels for each component into consideration (rather than some defaults), the resulting MTBF is much more realistic, and typically higher than what you would get with a “regular” MTBF prediction. This higher MTBF result allows companies to forego unneeded design changes and/or purchases of additional parts. fiXtress Pro clearly identifies problematic components in the design, increases design reliability, and ultimately increases the MTBF prediction value.

Component derating and stress assignment are used to simulate and test the operational conditions of the components in a way that is closer to their real-life operational requirements and constraints. Integrating these factors into our MTBF calculations results in a highly realistic MTBF prediction.

MTBF re-calculations must be done after design or component changes. When using fiXtress Pro, changes to part info can be easily updated in a central library and updates are propagated to all components with this part number so you don’t have to remember and manually edit all the components in the project.

fiXtress Pro makes it easy to import the BOM directly from the EDA tool (we support Altium Designer, Mentor Xpedition and Cadence’s OrCAD) with a few simple clicks of a button. The software also verifies the BOM data and alerts the user if there are missing part numbers etc. fiXtress Pro automatically fills-in some of the parameters (using part’s data) to save time and effort, while any additional missing info can be easily retrieved from the web.