Professional IC Distribution & Technical Solutions

The 17-21UYC/S530-A3/TR8 is an LED component manufactured by EVERLIGHT. Below are its key specifications, descriptions, and features:

Specifications:

• Type: SMD LED
• Color: Yellow
• Wavelength: 590nm (typical)
• Luminous Intensity: 20-40mcd (minimum to typical)
• Forward Voltage (Vf): 2.0V (typical)
• Forward Current (If): 20mA (maximum)
• Viewing Angle: 120°
• Package Size: 2.0mm x 1.25mm x 0.8mm
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -40°C to +100°C

Descriptions:

• Application: Used in backlighting, indicators, and general lighting.
• Mounting Type: Surface-mount (SMD)
• Lead-Free & RoHS Compliant: Yes

Features:

• High Brightness: Provides clear visibility in various lighting conditions.
• Wide Viewing Angle: 120° ensures broad light dispersion.
• Compact Design: Small form factor suitable for space-constrained applications.
• Reliable Performance: Stable operation across a wide temperature range.

This LED is commonly used in consumer electronics, automotive dashboards, and industrial equipment for status indication and illumination.

# Technical Analysis of EVERLIGHT’s 17-21UYC/S530-A3/TR8 LED Component

## 1. Practical Application Scenarios

The 17-21UYC/S530-A3/TR8 is a high-performance surface-mount LED from EVERLIGHT, designed for applications requiring reliable illumination with precise color characteristics. Key use cases include:

• Automotive Lighting: Used in dashboard backlighting, interior ambient lighting, and status indicators due to its stable luminous intensity and resistance to temperature fluctuations.
• Consumer Electronics: Integrated into LCD backlighting for displays, keypad illumination, and status LEDs in smart devices, benefiting from its compact form factor (SMD package) and energy efficiency.
• Industrial Indicators: Employed in control panels and machinery status lights where high visibility and long-term reliability are critical.
• Medical Devices: Suitable for diagnostic equipment indicators where consistent color output and low power consumption are essential.

The LED’s dominant wavelength (530 nm, green) and low forward voltage make it ideal for battery-powered applications, while its wide viewing angle ensures uniform light distribution in panel-mounted designs.

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

Pitfall 1: Thermal Management Issues

Excessive current or poor PCB thermal design can degrade LED performance.

• Solution: Adhere to the absolute maximum ratings (e.g., forward current, junction temperature) and implement thermal vias or heatsinks in high-duty-cycle applications.

Pitfall 2: Inconsistent Color Output

Variations in drive current or improper binning can lead to color shifts.

• Solution: Use constant-current drivers and verify EVERLIGHT’s binning specifications during procurement to ensure color consistency.

Pitfall 3: Poor Solder Joint Reliability

Incorrect reflow profiles or pad design may cause solder cracking.

• Solution: Follow EVERLIGHT’s recommended reflow soldering profile and ensure proper pad dimensions per IPC-7351 standards.

Pitfall 4: ESD Sensitivity

ESD exposure during handling can damage the LED.

• Solution: Implement ESD protection measures (e.g., grounded workstations, anti-static packaging) during assembly.

## 3. Key Technical Considerations for Implementation

• Electrical Parameters:
• Verify forward voltage (Vf) and forward current (If) compatibility with the driver circuit.
• Ensure the reverse voltage (Vr) is not exceeded to prevent damage.
• Optical Performance:
• Account for luminous intensity (Iv) and viewing angle when designing light guides or diffusers.
• Mechanical Constraints:
• Confirm footprint compatibility (SMD package dimensions) with the PCB layout.
• Environmental Factors:
• Assess operating temperature range and humidity resistance for harsh environments.

By addressing these factors, designers can maximize the reliability and performance of the 17-21UYC/S530-A3/TR8 in their applications.