LED Component Datasheet - Peak Wavelength λp - Packaging Details - Electrostatic Bag, Inner Carton, Outer Carton, Packing Quantity - English Technical Document

1. Document Overview and Lifecycle

This technical document pertains to an LED component, providing essential specifications and handling information. The document is identified as being in the Revision 3 lifecycle phase, indicating it is a mature and stable version of the specification. The release date for this revision is recorded as July 12, 2013, at 14:02:30. Notably, the document carries an "Expired Period: Forever" designation, signifying that this version of the specification is intended to be permanently valid and does not have a scheduled obsolescence date. This is common for finalized product datasheets that define long-term technical parameters.

2. Core Technical Parameter: Peak Wavelength

A key photometric parameter specified in the document is the Peak Wavelength (λp). The peak wavelength is the specific wavelength at which the LED emits its maximum optical power or intensity. It is a fundamental characteristic that defines the dominant color of the light output. For example, in visible light LEDs, λp determines whether the LED appears red, green, blue, or another specific hue. The exact value for λp is a critical design parameter for applications requiring precise color matching, spectral purity, or specific photobiological effects. Engineers must select components based on this parameter to ensure the emitted light meets the application's spectral requirements.

3. Packaging and Handling Specifications

The document provides detailed packaging information to ensure the component's integrity during storage, transportation, and handling before assembly. The packaging is structured in multiple layers, each serving a specific protective function.

3.1 Primary Packaging: Electrostatic Bag

The innermost layer of protection is the electrostatic bag. This bag is specifically designed to shield the sensitive LED components from Electrostatic Discharge (ESD). ESD can cause immediate or latent damage to the semiconductor junctions inside the LED, leading to premature failure or degraded performance. The use of a proper ESD bag is a mandatory precaution for all static-sensitive devices.

3.2 Secondary Packaging: Inner Carton

The Inner Carton provides the next level of protection. Its primary functions are:

• Physical Protection: It cushions the ESD bags containing the LEDs against minor impacts, compression, and vibration during handling.
• Organization: It typically holds a specific, manageable quantity of ESD bags, keeping them orderly and preventing tangling or damage from loose components.
• Moisture Barrier: It offers an additional layer of defense against environmental humidity.

3.3 Tertiary Packaging: Outer Carton

The Outer Carton is the shipping container. It is designed for robustness and logistics:

• Shipping Durability: Constructed from corrugated cardboard or similar sturdy material to withstand the rigors of transportation, including stacking, palletization, and potential rough handling.
• Labeling: It carries all necessary shipping labels, part numbers, quantity information, barcodes, and handling instructions (e.g., "Fragile," "Keep Dry," "This Side Up").
• Weather Protection: Provides the main barrier against environmental elements during storage and transit.

3.4 Packing Quantity

The document specifies a Packing Quantity. This is the total number of LED units contained within the complete packaging hierarchy (e.g., X pieces per ESD bag, Y bags per inner carton, Z inner cartons per outer carton). Knowing the packing quantity is essential for inventory management, production planning, and cost calculation. It helps purchasers and production managers understand the minimum orderable unit and plan material requirements accurately.

4. Application Guidelines and Design Considerations

While the provided excerpt is concise, several critical application guidelines can be inferred from the specified parameters and packaging details.

4.1 Handling and ESD Precautions

The explicit mention of an electrostatic bag underscores the component's sensitivity to ESD. Best practices include:

• Always handle the LEDs at a properly grounded ESD workstation.
• Use wrist straps and ESD-safe tools.
• Keep components in their ESD-safe packaging until the moment they are needed for assembly.
• Avoid touching the LED leads or package directly with bare hands.

4.2 Storage Conditions

The multi-layer packaging suggests the need for controlled storage:

• Store in a cool, dry environment to prevent moisture absorption, which can cause "popcorning" during reflow soldering.
• If the packaging has been opened or the components are stored for an extended period, consider baking them according to the moisture sensitivity level (MSL) before reflow to drive off absorbed moisture.
• Keep the outer cartons away from direct sunlight and extreme temperatures.

4.3 Integration Based on Peak Wavelength

The peak wavelength (λp) drives the application design:

• Color-Sensitive Applications: For signage, displays, or architectural lighting, λp must be tightly matched across all LEDs to ensure color consistency.
• Sensing Applications: In optical sensors (e.g., proximity, color sensing), the λp must align with the sensitivity peak of the photodetector or the absorption spectrum of the target material.
• Photobiological Applications: For horticultural lighting or medical devices, specific λp values are chosen to trigger desired biological responses in plants or human tissue.

5. Technical Deep Dive: Understanding LED Parameters

To fully utilize the information in a datasheet, understanding related parameters is crucial.

5.1 Relationship Between Peak Wavelength and Dominant Wavelength

While Peak Wavelength (λp) is the point of maximum radiant power, Dominant Wavelength (λd) is the single wavelength perceived by the human eye that matches the LED's color. For monochromatic LEDs (e.g., pure red, green, blue), λp and λd are very close. For phosphor-converted LEDs (e.g., white LEDs), they can be significantly different, as λp might be in the blue spectrum (from the pump LED) while λd is in the white region.

5.2 Spectral Width (FWHM)

The Full Width at Half Maximum (FWHM) of the emission spectrum is another critical parameter. It describes the range of wavelengths the LED emits around the peak. A narrow FWHM indicates a more monochromatic, spectrally pure light source, which is desirable for applications like spectroscopy or high-color-gamut displays. A broad FWHM is typical for white LEDs.

5.3 Implications of "Forever" Lifecycle Phase

A "Forever" expired period and a "Revision 3" status imply this is a final, non-obsolescing product specification. This is advantageous for long-term product designs, as it ensures component availability and consistency over the product's lifetime without forced redesigns due to part discontinuation. Designers can have confidence in the long-term supply of this exact component variant.

6. Common Questions and Troubleshooting

6.1 What if the measured wavelength differs from the datasheet λp?

Datasheet λp is typically given at a specific test current (e.g., 20mA) and junction temperature (e.g., 25°C). In real operation, λp shifts with drive current and temperature (generally increasing with temperature for AlGaInP LEDs and decreasing for InGaN LEDs). Always consult the datasheet for characteristic curves. Ensure your measurement setup (integrating sphere, spectrometer calibration) is accurate.

6.2 Can the packaging be reused?

Electrostatic bags can be reused only if they are undamaged and maintain their shielding properties. Bags with holes, tears, or compromised seals should be discarded. Inner and outer cartons are generally for single-use shipping and lack the controlled environment for long-term component storage once opened.

6.3 How should bulk quantities be stored after opening the outer carton?

If an inner carton is opened but not all components are used, the remaining LEDs in their ESD bags should be placed in a sealed, moisture-barrier bag with desiccant and stored in a low-humidity cabinet. Record the date of opening to manage shelf life according to the component's Moisture Sensitivity Level (MSL).

7. Practical Application Example

Scenario: Designing a status indicator panel for industrial equipment requiring a specific amber color for "standby" mode.

1. Parameter Selection: The designer references this datasheet to select an LED with a peak wavelength (λp) corresponding to the desired amber hue (e.g., around 590 nm).
2. Supply Chain: The purchasing department orders based on the packing quantity, ensuring they procure full outer cartons for cost efficiency and proper handling.
3. Production: The factory receives the sealed outer cartons. In the ESD-protected assembly area, an operator opens an inner carton, removes an ESD bag, and uses automated equipment to place the LEDs onto the PCB.
4. Quality Assurance: A sample of assembled boards may be tested with a spectrometer to verify the emitted light's peak wavelength matches the design specification, ensuring color consistency across all units of the equipment.

8. Industry Context and Trends

The focus on precise peak wavelength and robust, ESD-safe packaging reflects broader trends in the electronics and optoelectronics industry:

• Miniaturization and Sensitivity: As LED chips become smaller and more efficient, they often become more susceptible to ESD damage, making proper packaging and handling protocols even more critical.
• Color Consistency Demands: Applications like micro-LED displays, automotive lighting, and high-end retail lighting require extremely tight binning of LEDs based on λp and other color coordinates, pushing manufacturers toward more precise epitaxial growth and testing processes.
• Supply Chain Traceability: Detailed packaging specifications, including lot codes and date stamps often found on labels, are part of a growing need for full traceability in automotive, medical, and aerospace applications.
• Sustainability in Packaging: While not indicated in this older document (2013), current trends strongly emphasize reducing plastic use (e.g., in ESD bags) and moving towards recyclable or biodegradable packaging materials without compromising component protection.

This datasheet, therefore, represents a snapshot of established, reliable engineering practice for a fundamental optoelectronic component, with its principles remaining highly relevant in contemporary design and manufacturing.