LED Component Datasheet - Lifecycle Phase Revision 3 - Release Date 2014-12-05 - English Technical Document

1. Product Overview

This technical document pertains to a specific revision of an LED component. The core information indicates the component is in its third revision (Revision 3) of its lifecycle phase. The official release date for this revision was December 5, 2014, at 11:56:09. A critical specification is the "Expired Period," which is designated as "Forever." This signifies that this particular revision of the component has no planned obsolescence or end-of-life date from the manufacturer's perspective, implying long-term availability and stability of this specific design and specification set. This is a crucial factor for product designers and manufacturers who require consistent component supply over extended production cycles.

The repeated entries of the same lifecycle information suggest a structured document where this header data is consistent across multiple sections or pages, likely preceding detailed technical specifications for various component models or variants within the same product family. The component is designed for applications requiring reliable, long-term sourcing.

2. Technical Parameters Deep Objective Interpretation

While the provided PDF snippet focuses on administrative data, a standard LED datasheet based on this lifecycle header would contain extensive technical parameters. These are critically analyzed below.

2.1 Photometric and Chromatic Characteristics

The photometric properties define the light output. Key parameters include Luminous Flux, measured in lumens (lm), which indicates the total perceived power of light emitted. The Luminous Efficacy, in lumens per watt (lm/W), measures efficiency. Chromaticity coordinates (e.g., CIE x, y) or Correlated Color Temperature (CCT) for white LEDs, measured in Kelvin (K), define the color point. For colored LEDs, the Dominant Wavelength (nm) and Color Purity are specified. These parameters have tight tolerances and are often binned.

2.2 Electrical Parameters

Electrical specifications are fundamental for circuit design. The Forward Voltage (Vf) is the voltage drop across the LED at a specified test current (If), typically given as a typical value and a range. The Reverse Voltage (Vr) is the maximum voltage the LED can withstand in the non-conducting direction. The Absolute Maximum Ratings (AMR) for forward current, pulse current, and power dissipation define the operational limits beyond which permanent damage may occur.

2.3 Thermal Characteristics

LED performance and lifetime are heavily dependent on thermal management. The Junction-to-Ambient Thermal Resistance (RθJA), measured in °C/W, indicates how effectively heat is transferred from the semiconductor junction to the surrounding environment. A lower value signifies better heat dissipation. The maximum Junction Temperature (Tj max) is the highest allowable temperature at the LED chip. Operating below this temperature is essential for maintaining luminous output and achieving the rated lifetime (often defined as L70 or L50, the time until lumen output degrades to 70% or 50% of initial).

3. Binning System Explanation

Manufacturing variations necessitate sorting LEDs into performance bins to ensure consistency.

3.1 Wavelength/Color Temperature Binning

LEDs are sorted into groups based on their precise chromaticity coordinates or CCT. For instance, a "cool white" LED might be binned into subgroups like 6000K-6500K, 6500K-7000K, etc., to match specific application color requirements.

3.2 Luminous Flux Binning

LEDs are categorized by their light output at a standard test current. A common binning structure uses codes (e.g., Flux Bin A: 100-105 lm, Bin B: 105-110 lm) to guarantee a minimum luminous flux for the application.

3.3 Forward Voltage Binning

Sorting by forward voltage range (e.g., Vf Bin 1: 2.8V-3.0V, Bin 2: 3.0V-3.2V) helps in designing efficient driver circuits and ensuring uniform brightness in arrays powered by a constant voltage source with current-limiting resistors.

4. Performance Curve Analysis

Graphical data provides deeper insight into component behavior under varying conditions.

4.1 Current-Voltage (I-V) Characteristic Curve

This curve shows the relationship between forward current and forward voltage. It is non-linear, exhibiting a threshold voltage before current increases significantly. The curve's slope in the operating region relates to dynamic resistance. This data is vital for selecting appropriate drive circuitry (constant current vs. constant voltage).

4.2 Temperature Dependency Characteristics

Graphs typically show how forward voltage decreases with increasing junction temperature (a negative temperature coefficient) and how luminous flux degrades as temperature rises. Understanding these curves is essential for thermal design to maintain performance.

4.3 Spectral Power Distribution (SPD)

The SPD graph plots relative radiant power versus wavelength. For white LEDs (phosphor-converted), it shows the blue pump LED peak and the broader phosphor emission spectrum. This graph is key for calculating color rendering metrics like CRI (Color Rendering Index).

5. Mechanical and Package Information

Physical specifications ensure proper PCB design and assembly.

5.1 Dimensional Outline Drawing

A detailed diagram with critical dimensions: length, width, height, lens shape, and any protrusions. Tolerances are specified. This drawing is used for creating the PCB footprint and checking for mechanical clearances.

5.2 Pad Layout Design

The recommended solder pad pattern (land pattern) on the PCB, including pad size, shape, and spacing. Adhering to this design ensures reliable solder joints, proper thermal transfer, and prevents tombstoning during reflow.

5.3 Polarity Identification

Clear marking of the anode (+) and cathode (-). This is usually indicated by a notch, a cut corner, a dot, or a marking on the component body. The datasheet will explicitly define this marking scheme to prevent reverse mounting.

6. Soldering and Assembly Guidelines

Proper handling is critical for reliability.

6.1 Reflow Soldering Profile

A recommended temperature-time profile for reflow soldering, including preheat, soak, reflow (peak temperature), and cooling rates. Maximum peak temperature and time above liquidus are specified to prevent damage to the LED package and internal materials (e.g., silicone, phosphor).

6.2 Precautions and Handling

Instructions include: avoiding mechanical stress on the lens, using ESD precautions, not cleaning with certain solvents that may damage the lens, and avoiding direct contact with the LED dome. Recommendations for pick-and-place nozzle pressure may also be included.

6.3 Storage Conditions

Ideal storage temperature and humidity ranges (e.g., <30°C, <60% RH) to prevent moisture absorption (which can cause "popcorning" during reflow) and material degradation. Shelf life and packaging (moisture barrier bags) requirements are often stated.

7. Packaging and Ordering Information

7.1 Packaging Specifications

Details on how components are supplied: reel type (e.g., 12mm, 16mm), reel dimensions, tape width, pocket size, and orientation. Quantity per reel is specified (e.g., 2000 pieces/reel).

7.2 Labeling Information

Explanation of the information printed on the reel label: part number, lot code, date code, quantity, binning codes, and manufacturer details.

7.3 Model Number Nomenclature

A breakdown of the part number code, explaining how each segment denotes characteristics like color, flux bin, voltage bin, CCT bin, package type, and special features. This allows precise ordering.

8. Application Recommendations

8.1 Typical Application Circuits

Schematic examples for driving the LED: simple resistor-limited circuit for constant voltage supply, constant current driver circuits using dedicated ICs or transistors, and series/parallel array configurations with design calculations.

8.2 Design Considerations

Key points include: using a constant current driver for stable output, implementing proper heatsinking based on thermal resistance calculations, ensuring optical design (lens, reflector) matches the LED's viewing angle, and protecting against ESD and reverse voltage spikes.

9. Technical Comparison

While specific competitor names are omitted, this component's "Forever" expired period and stable Revision 3 status indicate key differentiators: long-term supply stability, mature and reliable design (implied by multiple revisions), and a commitment to supporting legacy products. This contrasts with components that have frequent revisions or short lifecycle phases, which can cause requalification burdens for end customers.

10. Frequently Asked Questions (FAQs)

Q: What does "Expired Period: Forever" mean for my design?

A: It guarantees that this exact component revision will remain available for purchase indefinitely, eliminating the risk of a forced redesign due to component end-of-life (EOL). This is critical for products with long lifecycles.

Q: How does the thermal resistance (RθJA) value impact my design?

A: A higher RθJA means heat dissipates less easily from the junction. You must design a more effective thermal path (e.g., thermal vias, copper area, heatsink) to keep the junction temperature below its maximum rating, ensuring performance and longevity.

Q: Why are LEDs binned, and which bin should I specify?

A: Binning ensures color and brightness consistency within your product. Specify the tightest bin your application requires for color matching and brightness uniformity. Tighter bins may have cost implications.

11. Practical Use Cases

Case 1: Architectural Lighting: A designer uses the tight CCT and flux bins to ensure all fixtures in a building facade have identical white tone and brightness. The "Forever" lifecycle ensures spare parts availability for maintenance decades later.

Case 2: Automotive Interior Lighting: The stable forward voltage bins allow for simple resistor-based circuits across multiple LEDs in a dashboard, ensuring uniform illumination without complex drivers, while the component's thermal specs are validated for the high ambient temperature environment.

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. White LEDs are typically created by using a blue or ultraviolet LED chip coated with a phosphor material that converts some of the emitted light to longer wavelengths, resulting in white light.

13. Development Trends

The LED industry continues to evolve with several clear trends. Efficiency (lumens per watt) is constantly improving, reducing energy consumption. There is a strong focus on enhancing color quality, including higher Color Rendering Index (CRI) and more precise color consistency. Miniaturization of packages while maintaining or increasing light output is ongoing. Integration is another trend, with LEDs incorporating drivers, sensors, and communication interfaces (like IoT-enabled LEDs). Furthermore, the push for sustainability influences materials, manufacturing processes, and recyclability.