Professional IC Distribution & Technical Solutions

The ELM-1172USOWB/S530-A6 is an LED component manufactured by EVERLIGHT. Below are its specifications, descriptions, and features:

Specifications:

• Manufacturer: EVERLIGHT
• Color: White
• Lens Color: Water Clear
• Forward Voltage (Vf): 3.2V (typical)
• Forward Current (If): 20mA
• Luminous Intensity (Iv): 6000mcd (minimum)
• Viewing Angle: 120°
• Package Type: PLCC-2 (Surface Mount)
• Dimensions (L x W x H): 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 white LED
• Suitable for backlighting, indicator applications, and general lighting
• RoHS compliant

Features:

• Wide viewing angle (120°)
• Low power consumption
• High luminous intensity
• Compact SMD design for easy PCB mounting
• Reliable performance under varying temperature conditions

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

# ELM-1172USOWB/S530-A6: Application Analysis, Design Pitfalls, and Implementation

## Practical Application Scenarios

The ELM-1172USOWB/S530-A6 from EVERLIGHT is a high-performance infrared emitter designed for applications requiring reliable optical sensing and communication. Its key use cases include:

1. Proximity and Gesture Sensing

Integrated into smartphones, tablets, and IoT devices, the emitter enables non-contact gesture control and proximity detection. Its narrow emission angle (typ. ±10°) ensures precise targeting, reducing false triggers from ambient light.

2. Industrial Automation

Used in optical encoders and object detection systems, the ELM-1172USOWB/S530-A6 provides consistent output in harsh environments. Its robust construction supports operation at temperatures up to +85°C, making it suitable for factory automation.

3. Biometric Security

Paired with photodiodes, this emitter facilitates facial recognition and vein detection systems. Its 940nm wavelength minimizes visible light interference while maximizing sensitivity for silicon-based receivers.

4. Optical Communication

In IR data transmission (e.g., remote controls), the component’s fast switching time (<100ns) ensures high data integrity over short distances.

## Common Design Pitfalls and Avoidance Strategies

1. Thermal Management

*Pitfall:* Overdriving the emitter without proper heat dissipation reduces lifespan.

*Solution:* Adhere to absolute maximum ratings (e.g., 100mA forward current) and use PCB thermal reliefs or heatsinks for sustained operation.

2. Optical Misalignment

*Pitfall:* Off-axis placement degrades signal strength in sensing applications.

*Solution:* Align the emitter perpendicular to the receiver and use mechanical housings to fix positioning.

3. Ambient Light Interference

*Pitfall:* Sunlight or artificial light sources cause noise in detection circuits.

*Solution:* Implement modulated driving signals (e.g., 38kHz PWM) paired with synchronous demodulation in the receiver.

4. Electrical Overstress

*Pitfall:* Voltage spikes from inductive loads damage the emitter.

*Solution:* Include reverse-polarity protection diodes and current-limiting resistors in series.

## Key Technical Considerations

1. Forward Voltage and Current

Operate within the specified 1.35V (typ.) forward voltage and 50mA (recommended) forward current to balance brightness and longevity.

2. Spectral Characteristics

The 940nm peak wavelength requires matching receivers with high sensitivity in this range (e.g., EVERLIGHT’s PT-series phototransistors).

3. Mechanical Integration

The 3.2mm × 2.5mm × 1.6mm SMD package demands precise reflow soldering (peak temp: 260°C for ≤10s) to avoid delamination.

4. ESD Sensitivity

As a Class 1C ESD-sensitive device (HBM: 2kV), handle with grounded tools and storage protocols.

By addressing these factors, designers can optimize the ELM-1172USOWB/S530-A6’s performance across diverse applications while mitigating reliability risks.