Professional IC Distribution & Technical Solutions

The ELD-406SYGWB is a surface-mount LED component manufactured by EVERLIGHT. Below are its key specifications, descriptions, and features:

Specifications:

• Manufacturer: EVERLIGHT
• Color: Super Yellow Green
• Wavelength: 568nm (typical)
• Luminous Intensity: 400mcd (minimum) at 20mA
• Forward Voltage (Vf): 2.1V (typical), 2.5V (max) at 20mA
• Viewing Angle: 120°
• Package Type: PLCC-2 (Plastic Leaded Chip Carrier)
• Dimensions: 3.2mm x 2.8mm x 1.9mm
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -40°C to +100°C

Descriptions:

• High Brightness: Provides strong luminous intensity for visibility in various applications.
• Wide Viewing Angle: 120° ensures broad light distribution.
• Surface-Mount Design: Suitable for automated PCB assembly.
• Reliable Performance: Designed for long-term stability in industrial and consumer electronics.

Features:

• Low Power Consumption: Efficient operation at low forward voltage.
• RoHS & Halogen-Free Compliant: Environmentally friendly manufacturing.
• Moisture Sensitivity Level (MSL): MSL 2a (per J-STD-020)

This LED is commonly used in indicator lights, backlighting, automotive displays, and electronic signage.

For detailed technical data, refer to the official EVERLIGHT datasheet.

# ELD-406SYGWB: Technical Analysis and Implementation Considerations

## Practical Application Scenarios

The ELD-406SYGWB, a high-brightness SMD LED manufactured by EVERLIGHT, is designed for applications requiring robust illumination in compact form factors. Key use cases include:

1. Automotive Lighting:

• Daytime Running Lights (DRLs): The LED’s high luminous intensity (typ. 1200 mcd at 20 mA) and wide viewing angle (120°) ensure visibility in daylight.
• Interior Lighting: Used in dashboard backlighting due to its stable color consistency (dominant wavelength 570 nm) and low power consumption.

2. Consumer Electronics:

• Indicators for Smart Devices: Ideal for status LEDs in wearables and IoT devices, leveraging its small footprint (3.2 mm × 2.8 mm) and low forward voltage (2.1 V typ.).

3. Industrial Equipment:

• Machine Vision Systems: The yellow-green emission (585 nm peak) suits contrast enhancement in automated inspection environments.

## Common Design-Phase Pitfalls and Avoidance Strategies

1. Thermal Management Issues:

• Pitfall: Overdriving the LED beyond 30 mA (absolute maximum rating) without adequate heat sinking reduces lifespan.
• Solution: Implement PCB thermal vias or metal-core boards to dissipate heat. Use pulse-width modulation (PWM) for brightness control to minimize steady-state current.

2. Optical Misalignment:

• Pitfall: Improper lens design or placement leads to uneven light distribution.
• Solution: Simulate beam patterns using ray-tracing software and validate with prototyping. Ensure mechanical tolerances in housing design account for LED placement (±0.2 mm).

3. Electrical Overstress:

• Pitfall: Voltage transients from inductive loads (e.g., automotive relays) damage the LED.
• Solution: Add transient voltage suppression (TVS) diodes or series resistors to limit inrush current.

## Key Technical Considerations for Implementation

1. Forward Current Control:

• Maintain drive current at 20 mA for optimal efficiency. Exceeding 25 mA accelerates lumen depreciation.

2. ESD Sensitivity:

• The LED is rated for Class 1 ESD protection (HBM: 2 kV). Handle with ESD-safe equipment during assembly.

3. Environmental Robustness:

• The component operates from -40°C to +85°C. For harsh environments (e.g., automotive underhood), verify solder joint integrity under thermal cycling.

By addressing these factors, designers can leverage the ELD-406SYGWB’s performance while mitigating risks in high-reliability applications.