BQR CARE for Reliability

BQR CARE for reliability
Predict MTBF, FMEA, FTA and RBD already based on a schematic design.
OrCAD Capture
BQR predict Reliability and Maintenance

BQR was developed as a tool for consultants in complex problems. In the mewan time the tool is productized and used by many customers around the world.

Features of BQR CARE

BQR CARE has multiple features which are described here.

MTBF Prediction

MTBF Prediction

With Care MTBF the values for the MTBF calculation can be extracted and a simulation of the MTBF can be performed based on an isolated BOM and the models supplied. The result is e.g. an MTBF curve that makes statements about the probability of failure as a function of the temperature. Essentially, the MTBF is a probability forecast of the probability of failure of an assembly or a product between two defects. This probability of default is essentially derived from lifetime tests and field experience. One way of determining the MTBF is the Partcount method. This requires knowledge of the components used. For many components there are so-called failure probabilities (FIT, Failure in Time) in standards. The MTBF then results from the reciprocal of the entire FIT of the module. The total FIT of an assembly / unit is the sum of all individual FITs.

BQR Care Stress Derating
PCB Stress Derating

Stress Derating

Stress derating is mandatory for the MTBF calculation of electronic designs. This module compares the real stress load of the components with the allowed derated stress and not only assumes an average of 50% stress for all components. This means that overloaded components can be identified and possibly replaced by more powerful components. On the other hand, the MTBF calculation for lightly loaded components improves, as the real stress and temperature stress is evaluated. Standard, military and custom derating curves can be used.



FMEA and FMECA are analytical methods of reliability calculation to find potential vulnerabilities in systems. In quality management, FMEA is used preventively to avoid errors and increase technical reliability. FMEA is used in particular in the design or development phase of new products or processes and can make preliminary statements about series production. FMECA is an advanced FMEA for the analysis and assessment of the probability of default and expected harm. The implementation of FMECA gives hints for the optimization of technical conception and reliability. The result is a systematic description of occurring failure rates of individual components and the impact on a complete system. With BQR Care FMEA and BQR Care FMECA, it is possible to locate the components that have an effect on the function of the assembly, and it is possible to identify optimizations.


Reliability Block Diagrams

Reliability Block Diagrams IEC 61508 Reliability Block Diagrams (RBD) can be used to determine the Safety Integrity Level (SIL). SIL is a measure of the effectiveness of the safety functions. The SIL depends on the reliability in the case of danger and the shutdown in the event of a fault. The necessary SIL can be determined by hazard and risk analysis. When considering faults according to IEC 61508 within an FMEA, only the first fault is considered, but the reliability block diagrams can also guarantee two-fault safety (SIL 4).

BQR Care FTA for PCB

Fault Tree Analysis

FTA is a method of reliability analysis with the aim of identifying those failures that have a significant influence on the system behavior when intended use of an assembly / unit. With FTA, an unwanted event is given and searched for all causes and combinations of causes that lead to the given event. FTA serves to determine reliability characteristics, such as frequency of occurrence of failure combinations and undesired events or unavailability of the system when requested. FTA is a deductive method (top to down). The method of FTA makes it possible to model a system under consideration in a model that can be evaluated qualitatively and quantitatively in terms of system failure behavior. A fault tree is a graphical representation of logical relationships that lead to a given event.

YouTube Videos about BQR

BQR Reliability and Maintenance Engineering

BQR is a leader in reliability engineering and maintenance optimization solutions for the Electronic Design Automation and asset management markets. The innovative software helps engineers create more robust and reliable products, as well as improving the design process. With BQR solutions, you can save costs, deliver better products to the market, and ensure optimized, effective maintenance. BQR software is used in a variety of industries, including oil and gas, automotive, aerospace, energy, utilities and medical.

BQR fiXtress integrated in OrCAD

Reliability analysis and simulation fiXtress from BQR is integrated into OrCAD Capture. The information about the circuit is taken from the netlist in Capture and used for the simulation settings.

BQR Care Training

Public training classes are offered on a regular basis. In the table below you will see the time table, when these classes are offered. In addition you can ask for your own training on your site, which makes business sense, when you have five or more person attend the same class form one company. Cusomization of trainings is possible too.

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OrCAD Capture

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Create electronic schematics for PCB design and simulations.



PSpice Simulator

Circuit simulator to verify functionality, reliability and yield of your circuit directly from the schematic.