Professional IC Distribution & Technical Solutions

The ELD-425GWA/S594 is a high-brightness LED component manufactured by EVERLIGHT. Below are its key specifications, descriptions, and features:

Specifications:

• Color: Green
• Wavelength: 525nm (typical)
• Luminous Intensity: 4000mcd (min) @ 20mA
• Forward Voltage (Vf): 3.2V (typical)
• Reverse Voltage (Vr): 5V
• Viewing Angle: 120°
• Package Type: PLCC-2 (Surface Mount)
• Dimensions: 3.2mm x 2.8mm x 1.9mm
• Operating Temperature Range: -40°C to +85°C

Descriptions:

• The ELD-425GWA/S594 is a surface-mount LED with a PLCC-2 package, designed for high brightness and efficiency.
• It emits green light with a dominant wavelength of 525nm, suitable for indicators, backlighting, and display applications.
• The wide 120° viewing angle ensures uniform light distribution.

Features:

• High brightness (4000mcd minimum)
• Low power consumption
• RoHS compliant
• Lead-free and halogen-free
• Reliable performance across a wide temperature range

This LED is commonly used in automotive lighting, signage, consumer electronics, and industrial applications.

*(Note: Always refer to the official EVERLIGHT datasheet for detailed technical parameters and application guidelines.)*

# ELD-425GWA/S594: Technical Analysis and Implementation Guide

## Practical Application Scenarios

The ELD-425GWA/S594 is a high-performance infrared emitter diode (IRED) manufactured by EVERLIGHT, designed for applications requiring reliable optical sensing and communication. Key use cases include:

1. Proximity and Gesture Sensing

Integrated into consumer electronics (e.g., smartphones, tablets), the emitter enables non-contact detection by pairing with photodiodes. Its 940nm wavelength minimizes visible light interference, making it ideal for ambient-light-sensitive environments.

2. Industrial Automation

Used in optical encoders and object detection systems, the ELD-425GWA/S594 provides consistent output for precision alignment and motion control. Its robust construction ensures stability in high-vibration settings.

3. Biometric Security

Employed in facial recognition and iris scanning systems, the diode’s narrow beam angle and high radiant intensity enhance accuracy in low-light conditions.

4. Optical Communication

Suitable for short-range data transmission (e.g., IR remote controls), the component’s fast response time supports high-frequency modulation.

## Common Design-Phase Pitfalls and Avoidance Strategies

1. Thermal Management

*Pitfall:* Excessive forward current or poor heat dissipation degrades performance and lifespan.

*Solution:* Adhere to the datasheet’s absolute maximum ratings (e.g., 100mA forward current) and implement PCB thermal reliefs or heatsinks.

2. Optical Alignment

*Pitfall:* Misalignment with receivers reduces signal integrity.

*Solution:* Use mechanical fixtures or automated alignment tools during assembly, and verify angular displacement tolerances (±5° typical).

3. Drive Circuit Design

*Pitfall:* Inadequate current limiting causes oversaturation or premature failure.

*Solution:* Incorporate constant-current drivers and transient voltage suppression (TVS) diodes for surge protection.

4. Environmental Interference

*Pitfall:* Ambient IR noise disrupts detection.

*Solution:* Implement modulated signals with synchronous detection (e.g., 38kHz carrier) and optical filters.

## Key Technical Considerations for Implementation

1. Electrical Parameters

• Forward voltage: 1.35V (typical at 20mA)
• Peak wavelength: 940nm (±15nm)
• Reverse voltage limit: 5V

2. Optical Characteristics

• Beam angle: 20° (half-intensity)
• Radiant intensity: 20mW/sr (minimum at 100mA)

3. Mechanical Constraints

• Soldering profile: 260°C max for 10 seconds (reflow)
• Moisture sensitivity level (MSL): 3

For optimal performance, validate the emitter-receiver pair in the target environment early in the design cycle, and ensure compliance with IEC 62471 for eye safety.