LED (for optocoupler): Forward Voltage 1.2-1.8V

Component Specifications

Definition

A light-emitting diode (LED) specifically designed for use in optocoupler devices, which provide electrical isolation between input and output circuits by converting electrical signals into light signals that are transmitted across an isolation barrier to a photodetector.

Working Principle

The LED operates on electroluminescence principle where electrical current passing through semiconductor material causes photon emission. In optocouplers, this light output is transmitted through transparent isolation material to a photodetector, creating complete electrical isolation while enabling signal transmission.

Materials

Gallium arsenide phosphide (GaAsP) or gallium aluminum arsenide (GaAlAs) semiconductor materials, gold bonding wires, epoxy encapsulation with high dielectric strength, lead frame typically copper alloy with tin plating.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Wavelength	560-940nm (typically 850-940nm for infrared)
Package Type	DIP-4, DIP-6, SOP-4, Mini-Flat
Response Time	2-10μs
Forward Current	10-50mA
Forward Voltage	1.2-1.8V
Isolation Voltage	2500-5000Vrms
Radiant Intensity	3-20mW/sr
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, UL 1577, IEC 60950-1

Parent Products

This component is used in the following industrial products

Isolation Component (Optocoupler/Transformer)

Electrical isolation component that prevents high-voltage transients from damaging low-voltage control circuits in gate driver applications.

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Isolation Transformer/Optocoupler

An electronic component that provides electrical isolation between circuits while allowing signal or power transfer.

View Product Details

Engineering Analysis

Risks & Mitigation

LED degradation over time reducing light output
Thermal runaway at high currents
Moisture ingress affecting isolation properties
Electrostatic discharge damage during handling

FMEA Triads

Trigger: Excessive forward current
Failure: LED catastrophic failure or rapid degradation
Mitigation: Implement current limiting circuits, use derating guidelines, monitor operating conditions

Trigger: High ambient temperature
Failure: Reduced light output and shortened lifespan
Mitigation: Improve thermal design, ensure proper ventilation, select high-temperature rated components

Trigger: Voltage transients on input side
Failure: LED damage and loss of signal transmission
Mitigation: Add transient voltage suppression, implement proper grounding, use surge-protected designs

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Forward voltage ±0.2V, wavelength ±20nm, isolation voltage tested at 150% rated value for 1 minute

Test Method

IEC 60747-5-5 for optoelectronic isolation devices, UL 1577 for voltage withstand testing, accelerated life testing per MIL-STD-883

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of LED (for optocoupler)

Manufacturer profiles associated with LED (for optocoupler).

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Frequently Asked Questions

What is the main purpose of LED in optocouplers?

The LED converts electrical input signals into light signals that can be transmitted across an electrical isolation barrier, providing galvanic isolation while maintaining signal integrity.

How does LED wavelength affect optocoupler performance?

Infrared wavelengths (850-940nm) are commonly used as they provide optimal transmission through isolation materials and better matching with silicon photodetectors for higher efficiency and speed.

What are key reliability factors for optocoupler LEDs?

Forward current derating, thermal management, encapsulation integrity, and maintaining proper drive conditions to prevent degradation of light output over time.

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 (for optocoupler)