LED/Light Emitter: Forward Voltage 1.2-1.8 V

Q: What is the primary function of an LED/Light Emitter in an optocoupler?

It converts electrical input signals into light pulses to provide electrical isolation between circuits, preventing noise and voltage transference.

Q: How does wavelength affect performance in industrial applications?

Infrared wavelengths (e.g., 850 nm) are common for high efficiency and minimal interference, ensuring reliable signal transmission in noisy environments.

Component Specifications

Definition

An LED/Light Emitter is a key optoelectronic component within optocouplers and digital isolator ICs. It converts electrical signals into infrared or visible light pulses, enabling galvanic isolation between input and output circuits. This component ensures signal integrity while preventing ground loops, voltage spikes, and noise interference in industrial systems.

Working Principle

Operates on electroluminescence: when forward-biased, electrons recombine with holes in the semiconductor material (typically gallium arsenide or similar compounds), emitting photons. In optocouplers, this light is detected by a photodetector (e.g., phototransistor) on the isolated side, reconverting it to an electrical signal.

Materials

Semiconductor materials: Gallium Arsenide (GaAs), Gallium Aluminum Arsenide (GaAlAs), or Gallium Phosphide (GaP) for infrared/visible wavelengths. Encapsulation: Epoxy resin or silicone for protection and optical coupling.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Wavelength	850-950 nm (infrared typical)
Rise/Fall Time	<100 ns
Forward Current	10-50 mA
Forward Voltage	1.2-1.8 V
Isolation Voltage	Up to 5000 Vrms
Operating Temperature	-40°C to +100°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

IEC 60747-5-5, JEDEC JESD22

Parent Products

This component is used in the following industrial products

Optocoupler / Digital Isolator IC

An electronic component that provides electrical isolation between circuits while transmitting digital signals using light or electromagnetic coupling.

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Engineering Analysis

Risks & Mitigation

Thermal degradation from overcurrent
Output decay over time (lifetime)
Sensitivity to electrostatic discharge (ESD)
Optical misalignment in assembly

FMEA Triads

Trigger: Excessive forward current
Failure: Reduced light output or permanent damage
Mitigation: Implement current-limiting resistors and thermal management

Trigger: ESD exposure during handling
Failure: Catastrophic or latent component failure
Mitigation: Use ESD-safe protocols and protective packaging

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±5% on forward voltage and wavelength under specified conditions

Test Method

IEC 60747-5-5 for optoelectronic isolation, including high-potential (hipot) and lifetime testing

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/Light Emitter

Manufacturer profiles associated with LED/Light Emitter.

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Frequently Asked Questions

What is the primary function of an LED/Light Emitter in an optocoupler?