Professional IC Distribution & Technical Solutions

The ELD-436IDB is a high-brightness LED component manufactured by EVERLIGHT. Below are its key specifications, descriptions, and features:

Specifications:

• Manufacturer: EVERLIGHT
• Type: LED (Light Emitting Diode)
• Color: Infrared (IR)
• Wavelength: Typically 850nm or 940nm (exact value depends on variant)
• Forward Voltage (Vf): ~1.2V to 1.5V (varies by current)
• Forward Current (If): Typically 20mA (max varies by model)
• Viewing Angle: ~20° to 30° (depends on lens design)
• Package Type: 3mm or 5mm through-hole LED (exact size may vary)
• Luminous Intensity: High brightness (specific value depends on model)
• Operating Temperature: -40°C to +85°C (or similar range)

Descriptions:

• Designed for infrared applications such as remote controls, night-vision cameras, and optical sensors.
• Available in standard through-hole package for easy PCB mounting.
• Features high radiant intensity for efficient IR transmission.
• Commonly used in consumer electronics, security systems, and industrial automation.

Features:

• High reliability with long operational lifespan.
• Low power consumption for energy-efficient designs.
• Compatible with automated assembly processes.
• RoHS compliant (lead-free and environmentally friendly).

For exact technical details, refer to the EVERLIGHT datasheet for the specific ELD-436IDB variant.

# Technical Analysis of the EVERLIGHT ELD-436IDB Infrared Emitter Diode

## 1. Practical Application Scenarios

The EVERLIGHT ELD-436IDB is a high-performance infrared (IR) emitter diode designed for applications requiring reliable, high-speed optical communication and sensing. Below are key use cases:

A. Infrared Data Transmission

The ELD-436IDB is widely used in IR communication modules, such as remote control systems (TVs, air conditioners, and smart home devices). Its fast response time and high radiant intensity ensure efficient data encoding over short to medium distances.

B. Proximity and Motion Sensing

In industrial automation and consumer electronics, this emitter pairs with photodetectors to enable proximity sensing (e.g., automatic faucets, hand dryers) and motion detection (security systems, occupancy sensors). Its narrow emission angle improves detection accuracy.

C. Optical Encoders

The diode’s consistent output makes it suitable for rotary and linear encoders in robotics and CNC machinery, where precise position feedback is critical.

D. Biomedical Devices

Pulse oximeters and other medical sensors leverage the ELD-436IDB’s stable IR output for non-invasive blood oxygen monitoring.

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

A. Overdriving the Diode

Exceeding the forward current (If) rating can degrade the emitter prematurely.

Solution: Adhere to the datasheet’s absolute maximum ratings and implement current-limiting resistors or constant-current drivers.

B. Thermal Management Issues

Prolonged operation at high currents increases junction temperature, reducing efficiency and lifespan.

Solution: Use a PCB with adequate thermal dissipation, and consider pulse-width modulation (PWM) to reduce average power dissipation.

C. Optical Misalignment

Incorrect positioning relative to the detector leads to signal loss.

Solution: Use mechanical housings or alignment guides during assembly, and verify alignment with an IR-sensitive camera.

D. Ambient Light Interference

Sunlight or artificial light sources can saturate the receiver.

Solution: Implement modulated IR signals with synchronous detection (e.g., 38 kHz carrier) to filter out noise.

## 3. Key Technical Considerations for Implementation

A. Forward Voltage and Current Requirements

The ELD-436IDB typically operates at 1.35V (forward voltage) with a recommended 50mA forward current. Ensure the driver circuit matches these parameters.

B. Emission Wavelength

With a peak wavelength of 940nm, the emitter is optimized for compatibility with silicon photodetectors. Verify detector sensitivity at this wavelength.

C. Viewing Angle

The diode’s 30° half-angle provides a balance between beam concentration and coverage. Narrower angles may require precise alignment.

D. Soldering Conditions

Reflow soldering must comply with JEDEC J-STD-020 standards to prevent thermal damage. Hand soldering should be minimized.

By addressing these factors, designers can maximize the ELD-436IDB’s performance in their applications while avoiding common operational failures.