LED Component Lifecycle Document - Revision 2 - Release Date 2013-09-25 - English Technical Specification

1. Product Overview

This technical document provides the lifecycle and revision management information for a specific electronic component, likely an LED or similar semiconductor device. The core information pertains to the formal release and version control of the product specification. The document establishes the official status of Revision 2, which was released on September 25, 2013, and is designated to remain valid indefinitely, indicating a stable and finalized specification.

The repeated entries of the lifecycle data suggest this may be part of a larger document, a header/footer on each page, or a data log. The primary purpose is to communicate the authoritative version of the technical parameters and ensure all stakeholders are referencing the correct and current revision. This is critical for design consistency, manufacturing quality control, and procurement accuracy.

2. Technical Parameters Deep Objective Interpretation

While the provided PDF snippet does not contain explicit numerical values for photometric, electrical, or thermal parameters, the presence of a formal revision number implies that such detailed specifications exist in the full document. A revision change typically indicates updates, corrections, or clarifications to these core technical parameters.

2.1 Photometric and Electrical Characteristics

For a typical LED component, the full datasheet would include parameters such as forward voltage (Vf), forward current (If), luminous flux, dominant wavelength or correlated color temperature (CCT), and viewing angle. The transition to Revision 2 suggests these values may have been adjusted, tolerance ranges tightened, or test conditions standardized based on further characterization or feedback.

2.2 Thermal Characteristics

Thermal management is paramount for LED performance and longevity. Key parameters include the thermal resistance junction-to-ambient (RθJA) and the maximum junction temperature (Tj max). A revision might update these values based on new packaging materials, improved thermal interface, or more accurate measurement methodologies.

3. Binning System Explanation

LED manufacturing involves natural variations. A binning system categorizes components based on key performance metrics to ensure consistency in application.

3.1 Wavelength/Color Temperature Binning

LEDs are sorted into bins according to their dominant wavelength (for monochromatic LEDs) or correlated color temperature (for white LEDs). Revision 2 may have redefined the bin boundaries, added new bins, or changed the nomenclature to align with industry standards or customer requirements, ensuring color uniformity in final products.

3.2 Luminous Flux Binning

Components are also binned based on their light output at a specified test current. A revision could adjust the flux ranges for each bin to better match yield distribution or to introduce new, higher-performance tiers.

3.3 Forward Voltage Binning

Sorting by forward voltage helps in designing efficient driver circuits. Revision 2 might have updated the voltage bin ranges to reflect improvements in the epitaxial process, leading to a tighter distribution of Vf.

4. Performance Curve Analysis

Graphical data is essential for understanding component behavior under various conditions.

4.1 Current vs. Voltage (I-V) Curve

The I-V curve defines the relationship between forward current and forward voltage. A revision might include a new, more representative curve based on batch testing, showing the typical turn-on voltage and dynamic resistance.

4.2 Temperature Characteristics

Curves showing the variation of luminous flux or forward voltage with junction temperature are critical for thermal design. Revision 2 could provide updated graphs with data points measured over a wider temperature range.

4.3 Spectral Distribution

The spectral power distribution graph shows the intensity of light emitted at each wavelength. A revision may present a refined spectrum, potentially indicating a change in phosphor composition for white LEDs or improved purity for colored LEDs.

5. Mechanical and Packaging Information

The physical dimensions and construction details are vital for PCB layout and assembly.

5.1 Dimensional Outline Drawing

A detailed diagram showing the component's length, width, height, and any critical tolerances. While not in the snippet, this is a standard part of any component datasheet.

5.2 Pad Layout Design

The recommended footprint for the PCB lands, including pad size, shape, and spacing. This ensures proper solder joint formation and mechanical stability.

5.3 Polarity Identification

Clear marking of the anode and cathode, typically via a notch, dot, or shortened lead. Correct polarity is essential for circuit functionality.

6. Soldering and Assembly Guidelines

Proper handling and assembly are crucial for reliability.

6.1 Reflow Soldering Profile

Recommended time-temperature profile for reflow soldering, including preheat, soak, reflow, and cooling stages. This profile must be compatible with the component's packaging material and maximum temperature rating.

6.2 Precautions and Handling

Instructions for ESD (Electrostatic Discharge) protection, moisture sensitivity level (MSL), and recommendations for storage to prevent oxidation of the leads.

6.3 Storage Conditions

Specified temperature and humidity ranges for long-term storage, along with shelf life considerations, especially for moisture-sensitive packages.

7. Packaging and Ordering Information

Details on how the components are supplied and how to specify them.

7.1 Packaging Specifications

Description of the carrier tape, reel size, and quantity per reel. This information is necessary for automated pick-and-place assembly lines.

7.2 Labeling and Part Numbering

Explanation of the information printed on the reel label and the component part number structure, which typically encodes characteristics like color, flux bin, and voltage bin.

8. Application Recommendations

Guidance on how to effectively use the component in end products.

8.1 Typical Application Circuits

Schematics for simple drive circuits, such as using a current-limiting resistor with a constant voltage source or connection to a dedicated LED driver IC.

8.2 Design Considerations

Key points for designers, including thermal management strategies (adequate PCB copper area, heatsinking), optical design (lens selection, beam shaping), and electrical design (avoiding reverse voltage, inrush current protection).

9. Technical Comparison

While a direct comparison with other products is not in the snippet, the establishment of a formal revision implies a point of differentiation. Revision 2 may offer advantages over its predecessor (Revision 1) in terms of parameter consistency, reliability data, or expanded operating ranges. It represents a mature and validated product specification.

10. Frequently Asked Questions (FAQ)

Common questions based on the technical parameters might include:

• Q: What changed from Revision 1 to Revision 2?
  
  A: The specific changes would be listed in a revision history section of the full document, detailing updates to parameters, test methods, or added information.
• Q: What does \"Expired Period: Forever\" mean?
  
  A: It indicates this revision of the document has no planned end date for its validity. The specifications are considered stable and will not be superseded unless a new revision is formally issued.
• Q: Can I mix components from different bins in the same product?
  
  A: It is generally not recommended as it can lead to visible color or brightness inconsistencies. For uniform appearance, components from the same or adjacent bins should be used.

11. Practical Use Case

Scenario: Designing a Backlight Unit for an LCD Display

A designer selects this LED for a medium-brightness backlight. They use the luminous flux bin information to calculate the number of LEDs needed to achieve the target display brightness. The forward voltage bin data is used to design an efficient, multi-string LED driver circuit. The dimensional drawing ensures the LEDs fit within the tight mechanical constraints of the display bezel. Following the reflow profile guarantees reliable solder joints during mass production. The \"Forever\" expiration of the revision provides confidence in the long-term availability of components with identical specifications for future production runs and spare parts.

12. Principle Introduction

Light Emitting Diodes (LEDs) are semiconductor devices that emit light when an electric current passes through them. This phenomenon, called electroluminescence, occurs when electrons recombine with electron holes within the device, releasing energy in the form of photons. The color of the light is determined by the energy band gap of the semiconductor material used. White LEDs are typically created by using a blue LED chip coated with a yellow phosphor, which converts some of the blue light to longer wavelengths, resulting in white light. The technical datasheet provides the empirical characteristics of this physical process as implemented in a specific commercial component.

13. Development Trends

The LED industry continues to evolve with several clear trends. Efficiency, measured in lumens per watt (lm/W), is constantly improving, reducing energy consumption for the same light output. There is a strong push towards higher color rendering index (CRI) values, especially for lighting applications, to produce light that renders colors more naturally. Miniaturization is another trend, enabling LEDs to be used in ever-smaller devices. Furthermore, smart and connected lighting, integrating LEDs with sensors and control systems, is a growing application area. The shift towards human-centric lighting, which considers the biological and emotional effects of light, is also influencing spectral design. The existence of a stable revision like this one indicates the technology has reached a plateau of maturity for its specific class, while next-generation products would be documented under new part numbers or major revisions.