Lesson 9/1753%
MODULE 09

Optocoupler Derating

Designing for the part it will become, not the part you bought: LED current derating against aging curves, CTR margin stacking, temperature derating of every limit, and reliability math connecting operating conditions to expected lifetime.

⏳ Coming Soon — content in development

Learning Objectives

After completing this module, you will be able to:

Apply LED current derating from manufacturer aging data
Stack CTR margins: bin minimum, temperature, and end-of-life
Derate power dissipation and forward current with temperature
Estimate lifetime from stress conditions
Document derating rationale for design reviews

Planned Topics

LED current derating
CTR margin methodology
Temperature effects
Reliability engineering
Lifetime considerations

Reserved Sections

This module will follow the same interactive format as Module 1:

Interactive animations

Animated diagrams and simulations for this module are in development.

Engineering calculators

Module-specific design calculators will appear here.

Design examples

Worked examples with full component values are planned for this section.

Knowledge check

Multiple-choice, true/false, and scenario exercises will be added.

Downloadable resources

PDF notes, reference tables, and checklists will be provided.

While you wait: Module 1 — Introduction to Optocouplers — is fully available, including animations, the CTR and isolation calculators, and a complete knowledge check. Start there →