1. Product Overview
This technical document provides the formal lifecycle and revision control information for a specific electronic component, likely an LED or related semiconductor device. The core purpose of this document is to establish the official version and status of the product specification, ensuring consistency and traceability in manufacturing and application. The document indicates a stable, finalized revision with no planned expiration, signifying a mature and reliable product definition suitable for long-term design integration.
2. Technical Parameters and Lifecycle Data
The provided data focuses exclusively on administrative and lifecycle metadata rather than traditional performance parameters like voltage, current, or luminous flux. The key documented parameters are as follows:
- Lifecycle Phase: Revision. This indicates the product specification is in a state of controlled updates and corrections, not an initial draft or obsolete status.
- Revision Number: 2. This is the second formally released version of the product documentation. Changes from Revision 1 would typically be documented in a change log, which is implied but not provided in this excerpt.
- Expired Period: Forever. This is a critical parameter stating that this revision of the document does not have a scheduled end-of-life or supersession date. It remains valid indefinitely until a new revision is officially released.
- Release Date: 2013-10-18 18:37:47.0. This timestamp provides the exact moment this revision (Revision 2) was formally issued. This allows for precise version control in design and supply chain management.
3. In-Depth Analysis of Documented Information
3.1 Lifecycle Phase Interpretation
The \"Revision\" phase is a standard stage in product documentation management. It follows initial drafts and prototypes. A product in the Revision phase has its core parameters frozen, and any changes are managed through a formal revision control process. This offers stability for engineers designing the component into their systems, as they can rely on the specification not changing arbitrarily.
3.2 Implication of \"Forever\" Expiry
An \"Expired Period: Forever\" is uncommon for active products where continuous improvement is expected. It strongly suggests one of two scenarios: either the product is a very mature, standardized part (like a classic 5mm LED) where no further changes are anticipated, or this document snapshot is intended to preserve the exact specification for a particular project or regulatory filing, effectively archiving that version permanently.
3.3 Significance of Release Date
The precise release date (2013-10-18) is crucial for traceability. In industries with stringent quality controls, such as automotive or aerospace, the specific revision of every component used must be documented. This date allows linking a manufactured device back to the exact set of specifications that were current at the time of its design or production.
4. Application Guidelines and Design Considerations
When utilizing a component defined by this document, the primary consideration is revision control. Designers must ensure they are using Revision 2 of the specification. If a later revision (e.g., Revision 3) exists, the differences must be evaluated to determine compatibility. The \"Forever\" expiry simplifies long-term maintenance for legacy systems, as the specification for spare parts remains unchanged.
5. Performance and Reliability Context
While this excerpt lacks explicit performance curves (IV, temperature, spectrum), the lifecycle data implies performance stability. A product reaching a permanent-revision status typically has well-characterized and consistent behavior. All critical performance parameters—such as forward voltage, viewing angle, chromaticity coordinates, and thermal resistance—are defined within the full specification that this cover page references. Their values are fixed for Revision 2.
6. Mechanical and Packaging Information
The document structure suggests that detailed mechanical drawings, package dimensions, pad layouts, and polarity markings are contained in subsequent pages of the full datasheet. The header information confirms that all such mechanical specifications are part of the frozen Revision 2 definition.
7. Soldering and Assembly Guidelines
Standard soldering profiles (for reflow or wave soldering) and handling precautions are part of the complete component specification. The use of Revision 2 ensures that any assembly instructions or maximum temperature ratings are the specific ones validated for this version of the product.
8. Packaging and Ordering Information
The packaging type (tape-and-reel, tray), quantity per reel, and moisture sensitivity level (MSL) are defined in the full datasheet. The model number associated with Revision 2 is the key identifier for procurement. The permanent validity aids in long-term supply chain planning.
9. Typical Application Scenarios
A component with a long-stable revision is suitable for applications requiring long-term availability and minimal re-qualification effort. This includes industrial control systems, infrastructure lighting, automotive interior lighting, and consumer appliances with extended production cycles. The guaranteed specification stability supports products with lifespans of many years.
10. Comparison with Development-Phase Components
The key differentiator is predictability. Compared to a component in \"Preliminary\" or \"Engineering Sample\" phase, a \"Revision\" phase part with a permanent expiry offers no risk of parameter shifts. Designers do not need to plan for future specification changes, which reduces design iteration and validation costs.
11. Frequently Asked Questions (FAQs)
11.1 What does \"LifecyclePhase: Revision\" mean for my design?
It means the component's technical specifications are stable and controlled. You can design this part into your product with high confidence that the parameters will not change unexpectedly, minimizing future re-design risks.
11.2 If the expiry is \"Forever,\" does that mean the product will never be improved?
Not necessarily. It means this specific document revision (Revision 2) will never expire. The manufacturer may later release a Revision 3 with improvements, which would have its own release date and lifecycle status. Revision 2 remains valid as a reference for existing designs.
11.3 How do I ensure I am using the correct revision?
The revision number is typically part of the component's detailed model number or order code. You must cross-reference the supplier's part number with this document's revision. Always confirm the revision on the product packaging or directly with the supplier for critical applications.
12. Practical Use Case Example
Consider a manufacturer of emergency exit signs. They design a new product using an LED specified in Revision 2 of this document. They complete safety certification (e.g., UL, CE) based on this LED's specifications. Five years later, they need to manufacture more units. Because the LED's Revision 2 spec has an \"Expired Period: Forever,\" they can source the same exact LED part number, confident its performance matches the original certified design, without needing costly re-testing.
13. Technical Principle Introduction
The principle demonstrated here is formal document and product lifecycle management within engineering and manufacturing. It is a cornerstone of quality assurance, enabling traceability, change control, and consistency. Each revision represents a baseline of agreed-upon technical attributes, and the lifecycle phase (Revision, Obsolete, Preliminary) communicates the stability and intended use of that baseline to the engineering community.
14. Industry Trends and Evolution
The trend in component documentation is towards digital traceability and smarter data sheets. While the core concept of revisions remains, it is increasingly integrated with digital product passports and cloud-based data. Future systems may link a component's serial number directly to its specific revision of documentation and production batch data, enhancing supply chain transparency and quality control even further. The concept of a \"permanent\" revision aligns with the industry's need for stable platforms in long-lifecycle Internet of Things (IoT) and industrial equipment.
LED Specification Terminology
Complete explanation of LED technical terms
Photoelectric Performance
| Term | Unit/Representation | Simple Explanation | Why Important |
|---|---|---|---|
| Luminous Efficacy | lm/W (lumens per watt) | Light output per watt of electricity, higher means more energy efficient. | Directly determines energy efficiency grade and electricity cost. |
| Luminous Flux | lm (lumens) | Total light emitted by source, commonly called "brightness". | Determines if the light is bright enough. |
| Viewing Angle | ° (degrees), e.g., 120° | Angle where light intensity drops to half, determines beam width. | Affects illumination range and uniformity. |
| CCT (Color Temperature) | K (Kelvin), e.g., 2700K/6500K | Warmth/coolness of light, lower values yellowish/warm, higher whitish/cool. | Determines lighting atmosphere and suitable scenarios. |
| CRI / Ra | Unitless, 0–100 | Ability to render object colors accurately, Ra≥80 is good. | Affects color authenticity, used in high-demand places like malls, museums. |
| SDCM | MacAdam ellipse steps, e.g., "5-step" | Color consistency metric, smaller steps mean more consistent color. | Ensures uniform color across same batch of LEDs. |
| Dominant Wavelength | nm (nanometers), e.g., 620nm (red) | Wavelength corresponding to color of colored LEDs. | Determines hue of red, yellow, green monochrome LEDs. |
| Spectral Distribution | Wavelength vs intensity curve | Shows intensity distribution across wavelengths. | Affects color rendering and quality. |
Electrical Parameters
| Term | Symbol | Simple Explanation | Design Considerations |
|---|---|---|---|
| Forward Voltage | Vf | Minimum voltage to turn on LED, like "starting threshold". | Driver voltage must be ≥Vf, voltages add up for series LEDs. |
| Forward Current | If | Current value for normal LED operation. | Usually constant current drive, current determines brightness & lifespan. |
| Max Pulse Current | Ifp | Peak current tolerable for short periods, used for dimming or flashing. | Pulse width & duty cycle must be strictly controlled to avoid damage. |
| Reverse Voltage | Vr | Max reverse voltage LED can withstand, beyond may cause breakdown. | Circuit must prevent reverse connection or voltage spikes. |
| Thermal Resistance | Rth (°C/W) | Resistance to heat transfer from chip to solder, lower is better. | High thermal resistance requires stronger heat dissipation. |
| ESD Immunity | V (HBM), e.g., 1000V | Ability to withstand electrostatic discharge, higher means less vulnerable. | Anti-static measures needed in production, especially for sensitive LEDs. |
Thermal Management & Reliability
| Term | Key Metric | Simple Explanation | Impact |
|---|---|---|---|
| Junction Temperature | Tj (°C) | Actual operating temperature inside LED chip. | Every 10°C reduction may double lifespan; too high causes light decay, color shift. |
| Lumen Depreciation | L70 / L80 (hours) | Time for brightness to drop to 70% or 80% of initial. | Directly defines LED "service life". |
| Lumen Maintenance | % (e.g., 70%) | Percentage of brightness retained after time. | Indicates brightness retention over long-term use. |
| Color Shift | Δu′v′ or MacAdam ellipse | Degree of color change during use. | Affects color consistency in lighting scenes. |
| Thermal Aging | Material degradation | Deterioration due to long-term high temperature. | May cause brightness drop, color change, or open-circuit failure. |
Packaging & Materials
| Term | Common Types | Simple Explanation | Features & Applications |
|---|---|---|---|
| Package Type | EMC, PPA, Ceramic | Housing material protecting chip, providing optical/thermal interface. | EMC: good heat resistance, low cost; Ceramic: better heat dissipation, longer life. |
| Chip Structure | Front, Flip Chip | Chip electrode arrangement. | Flip chip: better heat dissipation, higher efficacy, for high-power. |
| Phosphor Coating | YAG, Silicate, Nitride | Covers blue chip, converts some to yellow/red, mixes to white. | Different phosphors affect efficacy, CCT, and CRI. |
| Lens/Optics | Flat, Microlens, TIR | Optical structure on surface controlling light distribution. | Determines viewing angle and light distribution curve. |
Quality Control & Binning
| Term | Binning Content | Simple Explanation | Purpose |
|---|---|---|---|
| Luminous Flux Bin | Code e.g., 2G, 2H | Grouped by brightness, each group has min/max lumen values. | Ensures uniform brightness in same batch. |
| Voltage Bin | Code e.g., 6W, 6X | Grouped by forward voltage range. | Facilitates driver matching, improves system efficiency. |
| Color Bin | 5-step MacAdam ellipse | Grouped by color coordinates, ensuring tight range. | Guarantees color consistency, avoids uneven color within fixture. |
| CCT Bin | 2700K, 3000K etc. | Grouped by CCT, each has corresponding coordinate range. | Meets different scene CCT requirements. |
Testing & Certification
| Term | Standard/Test | Simple Explanation | Significance |
|---|---|---|---|
| LM-80 | Lumen maintenance test | Long-term lighting at constant temperature, recording brightness decay. | Used to estimate LED life (with TM-21). |
| TM-21 | Life estimation standard | Estimates life under actual conditions based on LM-80 data. | Provides scientific life prediction. |
| IESNA | Illuminating Engineering Society | Covers optical, electrical, thermal test methods. | Industry-recognized test basis. |
| RoHS / REACH | Environmental certification | Ensures no harmful substances (lead, mercury). | Market access requirement internationally. |
| ENERGY STAR / DLC | Energy efficiency certification | Energy efficiency and performance certification for lighting. | Used in government procurement, subsidy programs, enhances competitiveness. |