Professional IC Distribution & Technical Solutions

The ELS-542GWB/R is a surface-mount LED component manufactured by EVERLIGHT. Below are its specifications, descriptions, and features:

Specifications:

• Color: Green (G) / Red (R) – Dual Color
• Lens Appearance: Water Clear
• Forward Voltage (Vf):
• Green: 2.1V (Typ.)
• Red: 2.0V (Typ.)
• Luminous Intensity (Iv):
• Green: 20mcd (Min.) @ 20mA
• Red: 20mcd (Min.) @ 20mA
• Viewing Angle: 120°
• Reverse Current (Ir): 10μA (Max.) @ 5V
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -40°C to +100°C
• Package Type: PLCC-4 (Plastic Leaded Chip Carrier)
• Dimensions (L x W x H): 3.2mm x 2.8mm x 1.9mm

Descriptions:

• The ELS-542GWB/R is a bi-color (Green/Red) LED in a compact PLCC-4 package.
• Designed for surface-mount applications, it is suitable for indicator lights, backlighting, and display panels.
• Features a wide viewing angle (120°) for better visibility.
• Operates at low power consumption with standard forward current (20mA).

Features:

• Dual-color LED (Green & Red) in a single package.
• High brightness with clear lens for enhanced visibility.
• RoHS compliant and lead-free.
• Reliable performance across a wide temperature range.
• Compatible with reflow soldering processes.

For detailed electrical and mechanical characteristics, refer to the official EVERLIGHT datasheet.

# Technical Analysis of EVERLIGHT’s ELS-542GWB/R LED Component

## 1. Practical Application Scenarios

The ELS-542GWB/R is a high-performance surface-mount LED from EVERLIGHT, designed for applications requiring precise color rendering and energy efficiency. Key use cases include:

• Automotive Lighting: Used in dashboard backlighting, interior ambient lighting, and status indicators due to its wide operating temperature range (-40°C to +85°C) and stable luminous intensity.
• Consumer Electronics: Integrated into LCD backlighting for TVs, monitors, and handheld devices, where consistent brightness and low power consumption are critical.
• Industrial Indicators: Employed in control panels and machinery status lights, benefiting from its high reliability and long operational lifespan (>50,000 hours).
• Medical Devices: Suitable for diagnostic equipment and surgical lighting due to minimal flicker and uniform light distribution.

The LED’s 1206 SMD package ensures compatibility with automated PCB assembly processes, making it ideal for high-volume production.

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

Thermal Management Issues

Pitfall: Inadequate heat dissipation can degrade luminous output and lifespan.

Solution: Implement proper PCB thermal vias and copper pours. Ensure maximum junction temperature (Tj) does not exceed 125°C.

Inconsistent Forward Voltage Matching

Pitfall: Variations in forward voltage (VF) across batches may cause uneven brightness in parallel configurations.

Solution: Use constant-current drivers instead of voltage-driven circuits. Verify binning codes for VF and luminous intensity consistency.

Optical Misalignment

Pitfall: Improper placement relative to light guides or diffusers leads to hotspots or uneven illumination.

Solution: Follow EVERLIGHT’s recommended footprint and optical spacing guidelines. Use simulation tools to validate light distribution before prototyping.

ESD Sensitivity

Pitfall: Electrostatic discharge (ESD) can damage the LED during handling.

Solution: Adhere to ESD protection protocols (e.g., grounded workstations) and consider adding transient voltage suppression (TVS) diodes in the circuit.

## 3. Key Technical Considerations for Implementation

• Electrical Parameters:
• Forward current (IF): 20mA (typical), 30mA (maximum)
• Forward voltage (VF): 3.2V (typical at 20mA)
• Reverse voltage (VR): 5V (maximum)
• Optical Characteristics:
• Dominant wavelength: 525nm (green)
• Luminous intensity: 60mcd (minimum at 20mA)
• Viewing angle: 120°
• Mechanical Compatibility:
• Package dimensions: 3.2mm × 1.6mm × 1.1mm
• Compatible with reflow soldering (peak temperature: 260°C for ≤10s)

For optimal performance, ensure PCB pad design follows IPC-7351 standards and avoid excessive mechanical stress during assembly.