INDUSTRY COMPONENT

LED/Photodiode

LED/Photodiode is an optoelectronic component that converts electrical signals to light (LED) or light to electrical signals (Photodiode) in industrial isolation and sensing applications.

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Component Specifications

Definition
The LED/Photodiode component is a dual-function optoelectronic device where the LED (Light Emitting Diode) emits infrared or visible light when forward-biased, and the photodiode detects incoming light and generates a proportional photocurrent when reverse-biased. In industrial applications, these are typically paired within optocouplers or transformers to provide electrical isolation, signal transmission, or sensing without direct electrical contact.
Working Principle
The LED operates on electroluminescence, where electron-hole recombination in semiconductor materials emits photons. The photodiode works on the photovoltaic effect, where incident photons generate electron-hole pairs in the depletion region, creating a photocurrent proportional to light intensity. In isolation applications, the LED's light output is optically coupled to the photodiode, transmitting signals across an insulating barrier.
Materials
Semiconductor materials: Gallium Arsenide (GaAs) for infrared LEDs, Gallium Phosphide (GaP) for visible LEDs, Silicon (Si) or Indium Gallium Arsenide (InGaAs) for photodiodes. Encapsulation: Epoxy resin or silicone for optical coupling and protection. Lead frames: Copper alloy with nickel or gold plating.
Technical Parameters
  • Wavelength 850-950 nm (infrared), 520-700 nm (visible)
  • Response Time 10-100 ns
  • Isolation Voltage 2500-5000 Vrms
  • Forward Voltage (LED) 1.2-2.2 V
  • Operating Temperature -40°C to +85°C
  • Current Transfer Ratio (CTR) 20-600%
  • Reverse Voltage (Photodiode) 30-100 V
Standards
ISO 9001, IEC 60747-5-2, JEDEC JESD22

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for LED/Photodiode.

LED photodiode optocoupler component industrial optoelectronics signal isolation photoelectric sensor transformer coupling infrared LED silicon photodiode LED/Photodiode LED/Photodiode in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Optocoupler/Transformer

An electronic component that provides electrical isolation and signal transmission between circuits using light or magnetic coupling.

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Engineering Analysis

Risks & Mitigation
  • Thermal degradation from excessive current
  • Optical coupling degradation due to contamination
  • ESD damage during handling
  • CTR drift over time
FMEA Triads
Trigger: Overcurrent in LED
Failure: LED burnout, reduced light output
Mitigation: Implement current limiting circuits, use thermal management, select components with appropriate power ratings
Trigger: Contamination on optical surfaces
Failure: Reduced CTR, signal loss
Mitigation: Clean room assembly, hermetic sealing, regular maintenance inspections
Trigger: ESD during installation
Failure: Catastrophic photodiode damage
Mitigation: ESD-protected workstations, proper handling procedures, ESD-rated packaging

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±10% for CTR, ±5 nm for wavelength, ±5% for forward voltage
Test Method
IEC 60747-5-2 for optocouplers, JEDEC standards for reliability testing, in-circuit testing for functional verification

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between LED and photodiode in this component?

The LED emits light when electrically activated, while the photodiode detects light and converts it to electrical current. They work together to transmit signals optically across an isolation barrier.

Why use LED/Photodiode in industrial applications?

They provide galvanic isolation, preventing electrical noise, ground loops, and high-voltage transients from damaging sensitive circuits, while enabling safe signal transmission in harsh environments.

How to test LED/Photodiode performance?

Test forward voltage and luminous intensity for LED, dark current and responsivity for photodiode, and Current Transfer Ratio (CTR) for the paired system using specialized optoelectronic test equipment.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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