Professional IC Distribution & Technical Solutions

The ELD-405SURWA/S530-A2 is a high-power LED manufactured by EVERLIGHT. Below are its key specifications, descriptions, and features:

Specifications:

• Wavelength: 405nm (Violet)
• Forward Voltage (Vf): 3.2V (Typical)
• Forward Current (If): 350mA (Max)
• Luminous Intensity: 200mW (Min)
• Viewing Angle: 120°
• Package Type: 5mm Round LED
• Lens Type: Water Clear
• Operating Temperature: -40°C to +85°C
• Storage Temperature: -40°C to +100°C

Descriptions & Features:

• High-power violet LED with a peak wavelength of 405nm.
• Suitable for UV curing, counterfeit detection, and medical applications.
• Wide viewing angle of 120° for broad illumination.
• Water-clear lens for enhanced light output.
• RoHS compliant and lead-free.
• Long lifespan and stable performance.

This LED is designed for applications requiring precise UV light emission with high efficiency.

# Technical Analysis of EVERLIGHT’s ELD-405SURWA/S530-A2 LED Component

## 1. Practical Application Scenarios

The ELD-405SURWA/S530-A2 is a high-performance surface-mount LED designed by EVERLIGHT for applications requiring precise optical performance and reliability. Key use cases include:

• Automotive Lighting: Used in daytime running lights (DRLs), interior ambient lighting, and dashboard indicators due to its high luminous intensity and stable output under varying temperatures.
• Industrial Indicators: Ideal for machinery status indicators where high visibility and long-term durability are critical.
• Consumer Electronics: Employed in backlighting for displays and status LEDs in smart home devices, benefiting from its compact form factor and energy efficiency.
• Medical Devices: Suitable for diagnostic equipment indicators where consistent color rendering and low power consumption are essential.

The LED’s 405nm wavelength (near-UV to visible spectrum) makes it particularly useful in specialized applications such as UV curing and fluorescence excitation, though thermal management must be carefully addressed.

## 2. Common Design-Phase Pitfalls and Avoidance Strategies

Pitfall 1: Inadequate Thermal Management

Excessive heat can degrade the LED’s lifespan and luminous efficiency.

• Solution: Implement a PCB with sufficient thermal vias and heatsinking. EVERLIGHT recommends adhering to the specified junction temperature (Tj) limits.

Pitfall 2: Incorrect Forward Current Application

Overdriving the LED beyond its rated forward current (If) leads to premature failure.

• Solution: Use a constant-current driver with tight tolerance (±5%) and verify against the datasheet’s If(max).

Pitfall 3: Poor Optical Alignment

Misalignment in reflector or lens designs can reduce light output efficiency.

• Solution: Simulate optical paths before PCB layout and validate with prototyping.

Pitfall 4: Moisture Sensitivity (MSL Rating)

The component may be sensitive to moisture absorption during reflow soldering.

• Solution: Follow EVERLIGHT’s Moisture Sensitivity Level (MSL) guidelines, including proper storage and baking procedures.

## 3. Key Technical Considerations for Implementation

• Electrical Parameters:
• Verify forward voltage (Vf) and ensure compatibility with the power supply.
• Account for reverse voltage (Vr) limitations to avoid damage during transient conditions.
• Optical Performance:
• Confirm viewing angle and luminous intensity for the intended application.
• Use diffusers or secondary optics if uniform illumination is required.
• Mechanical Constraints:
• Adhere to EVERLIGHT’s recommended land pattern and soldering profile (peak reflow temperature: 260°C max).

By addressing these factors, designers can optimize the ELD-405SURWA/S530-A2’s performance while mitigating risks in production and deployment.