Project Overview
Move from BOM to evidence with the next engineering action always visible.
Engineering Workflow
Select a step to continue the analysis.
Needs Attention
Controlling low-margin and failed criteria.
Engineering aid. PASS means the entered condition satisfies the selected derating criterion; it does not establish reliability, safety, qualification, or regulatory compliance.
Bill of Materials
Instances belong to parts; ratings belong to parts; operating stresses belong to instances.
| RefDes | MPN | Description | Category | Value | Subsystem | Assembly | Overall |
|---|
Part Library
Common manufacturer ratings and provenance shared by all matching instances.
| Manufacturer | Part Number | Normalized MPN | Description | Category | Confidence | Instances | Ratings | Evidence |
|---|
BOM Intelligence
Normalize part identity, review classification confidence, detect duplicate families, model alternates, and evaluate replacement impact.
Engineering aid. Classification and part-number similarity are heuristics. DERATE never substitutes a suggested alternate without an explicit engineering action.
Classification Review
Duplicate / Near-Duplicate Review
Alternate Parts
Alternates are explicit engineering relationships; they are not automatic substitutions.
Replacement Impact Analysis
Select “Analyze replacement” from an alternate relationship to simulate its effect on current component instances.
Assemblies & Subsystems
Hierarchical context for filtering and review.
Operating Conditions
Instance- and scenario-specific observed, calculated, measured, estimated, or assumed stress.
| RefDes | Parameter | Value | Unit | Source Type | Scenario | Notes |
|---|
Environment Profiles & Scenarios
Reusable environmental envelopes, operating-scenario coupling, and controlling worst-case identification.
Environment context is active engineering input. Scenario-specific ambient overrides take precedence over the linked profile. Rule applicability can use temperature, altitude, humidity, vibration, shock, contamination, and environment category.
Reusable Environment Profiles
Operating Scenario Matrix
Each scenario is independently evaluated.Controlling Worst-Case Scenario by Component
Worst status first, then lowest remaining margin.Derating Rules
Versioned, traceable rules with context-aware applicability, precedence, and conflict diagnostics.
| Enabled | ID / Rev | Layer | Category | Parameter | Model | Factor | Precedence | Applies When | Source |
|---|
Component Stress Analysis
Rating, operating stress, stress ratio, derated limit, margin, and status remain independently visible.
| RefDes | Parameter | Rating | Stress | Stress % | Rule | Allowed % | Derated Limit | Margin | Margin % | Status | Scenario |
|---|
Thermal Analysis
Multi-node thermal networks, parallel paths, coupled heat sources, junction-temperature margin, and temperature-dependent derating.
Screening model. Thermal-resistance networks are engineering approximations, not substitutes for CFD/FEA, manufacturer thermal characterization, or physical testing. DERATE exposes every path, correction, coupled source, and assumption used.
Junction Temperature Calculations
Temperature Derating Curves
Advanced Thermal Networks
Series nodes, parallel heat paths, airflow/board correction factors, temperature-dependent thermal resistance, and coupled-source approximations.
Thermal Model Guidance
Measured case path
Tj = Tc + Pd × θJC remains preferred when credible case temperature is available.
Multi-node / parallel path
Each path is a series sum; parallel paths combine as 1/θeq = Σ(1/θpath). Corrections and temperature coefficients remain explicit.
Thermal interaction
Coupled sources contribute weighted dissipated power. Coupling coefficients are engineering assumptions requiring validation.
Component-Specific Engineering Models
Family-specific screening models complement generic derating without replacing datasheet limits or detailed simulation.
Screening models. These models expose utilization and combined stress relationships using entered ratings and operating conditions. They do not infer missing manufacturer curves, SOA boundaries, lifetime constants, surge waveforms, or protection coordination data.
Advanced Stress Models
Transient, startup/shutdown, repetitive pulse, RMS/peak, duty-cycle, time-domain, and mission-profile screening.
Engineering scope. Advanced stress profiles are traceable screening calculations. Pulse/SOA/fuse/thermal conclusions still require applicable manufacturer curves and waveform definitions; DERATE does not invent those boundaries.
Stress Profiles
Mission Profiles
Automatic Worst-Case Envelope
For each component/criterion, DERATE identifies the controlling entered scenario and compares it with any advanced peak/RMS/average screening profile.
Worst-Case Circuit Analysis
Tolerance stacks, min/nom/max corners, Monte Carlo sampling, correlation, sensitivity, and probabilistic derating margin.
Screening model. DERATE v3.0 uses explicit user-entered sensitivities to propagate component/circuit variables into a selected stress criterion. It is not a SPICE solver. Correlation, distributions, and sensitivities are visible and must be supported by engineering evidence.
Tolerance Variables
Analyses
Selected Analysis Results
Run an analysis to calculate deterministic corners, Monte Carlo distributions, and sensitivity ranking.
Mission Profiles & Life-Cycle Exposure
Time-at-temperature histories, operating modes, startup counts, thermal cycling, duty histories, and accumulated stress exposure.
Exposure accounting, not lifetime prediction. DERATE accumulates time, temperature, load, utilization, startup, and thermal-cycle metrics. It does not translate these screening quantities into reliability or life without an explicit evidence-backed model.
Mission Profiles
Operating-Mode Timeline
Select a mission profile to visualize its sequence.
Time-at-Temperature & Duty History
Accumulated Stress Metrics
Life-Cycle Profile Comparison
Compare exposure bookkeeping between two mission definitions.
Design Dashboard
Engineering status is derived from individual criteria; failures are never averaged away.
Margin Distribution
Stress Map
Failures by Category
Analysis Completeness
Engineering Visualization
Interactive views of stress, margin, scenario control, subsystem concentration, and temperature sensitivity. Every graphic drills back to analysis evidence.
Visualization is a review aid. Status and margin remain derived from individual DERATE criteria; graphics never average away a failure.
Worst-Case Stress Gauges
Margin Distribution
Scenario Comparison
Worst-Case Component Ranking
Subsystem × Criterion Heatmap
Failure Clusters
Margin vs Temperature
Design Hotspots
Engineering-review priorities: low margin, high stress, failures, incomplete evidence, or exceptions.
Findings
Reviewable engineering objects generated from current calculations.
| ID | Component | Criterion | Scenario | Severity | Observed | Permitted | Margin | Workflow | Owner | Evidence |
|---|
Exceptions
An approved deviation does not erase the underlying failed calculation.
Assumption Register
Track what must later be verified, accepted, or invalidated.
| ID | Statement | Rationale | Owner | Status | Affected / Impact | Evidence | Validation |
|---|
Evidence Register
Local metadata and references to datasheets, tests, simulations, measurements, and calculations.
| ID | Type | Title | Revision / Date | Reference | Related | Status | Owner | Attachment | Notes |
|---|
Baselines
Immutable snapshots of the project state for formal review and revision comparison.
Revision Comparison
What changed, and did it improve or reduce engineering margin?
Engineering Report & Review Package
Generate a review-ready report and self-contained engineering evidence package from the current local project state.
Report + project JSON + registers + stress table + manifest + baseline comparison when selected.
Import / Export
No project data is transmitted externally.
Import BOM
CSV, JSON, or XLSX. XLSX is parsed locally in the browser.
Project Backup
Project JSON includes the BOM, ratings, operating scenarios, rules, findings workflow, assumptions, evidence metadata, exceptions, and baselines.
Analysis Export
The XLSX exporter writes a standards-compatible uncompressed workbook locally without external libraries.
Demo / Reset
Reliability Bridge
Prepare traceable component, stress, environment, quality, and mission inputs for downstream reliability models.
Derating is not reliability prediction. This bridge organizes model inputs and provenance. DERATE does not infer failure rate, MTBF, FIT, or life from derating compliance unless an explicit downstream reliability model provides that relationship.
Reliability Model Mappings
Model Readiness
Stress-to-Reliability Input Matrix
Worst entered stress, manufacturer-rating utilization, derated-limit utilization, operating-hours basis, quality level, and environment classification for mapped components.
Separation of Concerns
DERATE owns
Ratings, stress, derated limits, margin, environments, mission exposure, evidence provenance.
Ratings, stress, derated limits, margin, environments, mission exposure, evidence provenance.
Reliability model owns
Base failure rates, acceleration factors, quality factors, environment factors, damage laws, FIT/MTBF/life calculations.
Base failure rates, acceleration factors, quality factors, environment factors, damage laws, FIT/MTBF/life calculations.
Bridge exports
Traceable inputs plus model/source metadata and explicit missing-data flags.
Traceable inputs plus model/source metadata and explicit missing-data flags.
Datasheet Intelligence
Associate local datasheets, capture rating provenance, assist extraction, compare revisions, and require human verification before promotion.
Human verification required. Assisted extraction proposes candidates only. A candidate cannot become an authoritative part rating until its value, unit, source location, and datasheet revision are explicitly verified and promoted by a reviewer.
Datasheet Register
Verification Queue
Extracted Rating Candidates
Rating Provenance Coverage
Settings
Project metadata, review thresholds, interface preferences, and validation.