LED/Infrared Emitter: Optical Power Output 1-10 mW

Component Specifications

Definition

The LED/Infrared Emitter is a critical optoelectronic component within opto-isolators, converting electrical signals into optical signals (visible light or infrared) to enable galvanic isolation between circuits. It consists of a semiconductor chip (typically gallium arsenide, gallium aluminum arsenide, or similar materials) mounted in a reflective cavity with encapsulation. When forward-biased, electrons and holes recombine in the semiconductor, emitting photons at specific wavelengths (e.g., 850-950 nm for infrared). This component ensures noise immunity, high-voltage isolation, and reliable signal transmission in industrial environments, with applications ranging from motor controls to communication interfaces.

Working Principle

The LED/Infrared Emitter operates on electroluminescence. When a forward voltage is applied across the p-n junction, electrons from the n-region recombine with holes from the p-region, releasing energy as photons. The wavelength depends on the semiconductor bandgap (e.g., infrared emitters use materials like GaAs). In opto-isolators, this optical output couples to a photodetector (e.g., phototransistor), transmitting signals without electrical connection, providing isolation up to several kilovolts.

Materials

Semiconductor: Gallium Arsenide (GaAs), Gallium Aluminum Arsenide (GaAlAs), or similar III-V compounds for infrared; Gallium Phosphide (GaP) or Gallium Nitride (GaN) for visible LEDs. Substrate: Silicon or sapphire. Encapsulation: Epoxy resin or silicone with phosphor coatings (for visible LEDs). Leads: Copper alloy with tin or gold plating. Reflector: Aluminum or silver-coated ceramic.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Wavelength	850-950 nm (Infrared), 400-700 nm (Visible)
Package Type	Through-hole (e.g., 3 mm, 5 mm) or SMD (e.g., 0805, 1206)
Viewing Angle	15-60 degrees
Rise/Fall Time	10-100 ns
Forward Current	10-100 mA
Forward Voltage	1.2-2.2 V
Isolation Voltage	Up to 5 kV
Optical Power Output	1-10 mW
Operating Temperature	-40°C to +85°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 9001, ISO 14001, IEC 60747-5-2, JEDEC JESD22

Parent Products

This component is used in the following industrial products

Opto-isolator

An electronic component that transfers electrical signals between two isolated circuits using light waves.

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Engineering Analysis

Risks & Mitigation

Thermal degradation from overcurrent
Wavelength shift due to aging
Delamination of encapsulation under humidity
Reduced optical output from contamination
Electrical overstress from voltage spikes

FMEA Triads

Trigger: Excessive forward current or voltage
Failure: Catastrophic burnout or reduced optical power
Mitigation: Implement current-limiting resistors, use surge protection circuits, and adhere to datasheet specifications for maximum ratings.

Trigger: High ambient temperature or poor heat dissipation
Failure: Accelerated aging and wavelength drift
Mitigation: Design with adequate thermal management (e.g., heatsinks, ventilation), operate within temperature limits, and select materials with high thermal stability.

Trigger: Mechanical stress or vibration in industrial environments
Failure: Cracked encapsulation or broken leads
Mitigation: Use robust packaging (e.g., conformal coatings), secure mounting, and comply with vibration standards (e.g., IEC 60068-2-6).

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Forward voltage: ±0.2 V, Wavelength: ±10 nm, Optical power: ±20%

Test Method

Electrical testing per IEC 60747-5-2 (forward voltage, current), optical testing (spectroradiometry for wavelength, photometry for power), isolation testing (hipot testing at 5 kV AC for 1 minute), environmental testing (temperature cycling, humidity per IEC 60068-2-78).

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of LED/Infrared Emitter

Manufacturer profiles associated with LED/Infrared Emitter.

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Frequently Asked Questions

What is the difference between LED and Infrared Emitters in opto-isolators?

LED emitters produce visible light and are used where visual indication is needed, while infrared emitters (typically 850-950 nm) are common in opto-isolators for higher efficiency, better coupling with silicon photodetectors, and immunity to ambient light interference.

How does an LED/Infrared Emitter ensure electrical isolation?

It converts electrical signals to light, which travels across a dielectric gap (e.g., air or transparent material) to a photodetector, preventing direct electrical contact and providing high-voltage isolation (up to 5 kV) to protect sensitive circuits.

What factors affect the lifespan of an LED/Infrared Emitter?

Key factors include operating current (higher currents reduce lifespan), temperature (excessive heat degrades materials), drive circuit design (e.g., current limiting), and environmental conditions (humidity, contaminants). Typical lifespans range from 50,000 to 100,000 hours.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

LED/Infrared Emitter