LED Component Lifecycle Document - Revision 2 - Release Date 2014-05-16 - English Technical Specification

1. Document Overview

This technical document provides formal specification and lifecycle management information for a light-emitting diode (LED) component. The primary purpose of this document is to establish the definitive revision status and release parameters for the component, ensuring consistency and traceability in its application and procurement. The core information contained herein pertains to the official revision number and the associated release timeline, which are critical for version control and quality assurance in electronic design and manufacturing processes.

The document signifies a stable and finalized specification, as indicated by the \"Revision 2\" designation and the \"Forever\" expired period. This implies that the technical parameters defined in this revision are considered mature and are not subject to planned obsolescence or frequent changes, providing long-term reliability for design-in purposes.

2. Lifecycle and Revision Management

2.1 Lifecycle Phase Definition

The lifecycle phase is explicitly stated as \"Revision.\" In product lifecycle management for electronic components, this phase typically follows initial design, prototyping, and pre-production phases. A component in the \"Revision\" phase has undergone necessary design iterations and corrections based on testing and feedback. The specification is now locked for volume production. This status assures engineers and procurement specialists that the component's electrical, optical, and mechanical characteristics are stable and will remain consistent across manufacturing lots.

2.2 Revision Number Significance

The revision number is a critical identifier for tracking changes to the product's specification sheet. Revision: 2 indicates this is the second major issued version of the document. Changes from a hypothetical Revision 1 could include corrections to typographical errors, updates to test procedures, clarifications of ambiguous parameters, or minor adjustments to performance tolerances based on extended characterization data. It is essential for users to always reference the latest revision to ensure their designs are based on the most accurate and current information.

2.3 Validity and Expiry Period

The document carries an Expired Period: Forever. This is an uncommon but significant declaration in technical documentation. It means this specific revision of the datasheet is intended to have permanent validity for the defined product. It will not be superseded by a new revision for the same product variant unless a fundamental error is discovered. This provides exceptional long-term stability for legacy designs and systems that may remain in production or require maintenance for decades.

3. Release Information

3.1 Release Date and Timestamp

The official release of this document revision is timestamped: Release Date: 2014-05-16 18:04:55.0. This precise timestamp serves multiple purposes:

• Traceability: It allows exact tracking of when this specification became active.
• Version Control: It helps distinguish this revision from any previous or future releases.
• Regulatory Compliance: In some industries, having a documented release date is part of quality management system requirements (e.g., ISO 9001).

The date of 2014 indicates this is a well-established component, likely with a proven track record in the field.

4. Technical Parameter Context and Inferred Specifications

While the provided text snippet is minimal, the context of a lifecycle document for an LED implies a comprehensive set of technical parameters would be defined in the full datasheet. Based on standard industry practice for LED documentation, the following sections would be critically analyzed.

4.1 Photometric and Color Characteristics

A complete LED datasheet provides detailed photometric data. This includes Luminous Flux (measured in lumens, lm), which defines the total perceived light output. Luminous Intensity (measured in candelas, cd) and its spatial distribution, often shown in a polar diagram, are also specified. For color LEDs, dominant wavelength and color purity are key. For white LEDs, the correlated color temperature (CCT in Kelvin, K) and Color Rendering Index (CRI, Ra) are fundamental parameters that define the quality and hue of the white light. Binning information, grouping LEDs by slight variations in flux and color, is crucial for achieving uniform appearance in lighting applications.

4.2 Electrical and Thermal Parameters

The electrical operating conditions are defined by the Forward Voltage (Vf) at a specified test current (e.g., 20mA, 150mA, 350mA depending on power). The Forward Current (If) rating, both continuous and peak, dictates the drive circuit design. Thermal management is paramount for LED performance and longevity. Key parameters include the Thermal Resistance (Rth_j-s or Rth_j-c) from the junction to the solder point or case, and the maximum Junction Temperature (Tj_max). Understanding the relationship between drive current, forward voltage, and junction temperature is essential for reliable design.

4.3 Mechanical and Packaging Information

The physical dimensions of the LED package are provided in detailed mechanical drawings. This includes length, width, height, and the size and position of the solder pads or leads. The package material (e.g., PPA, PCT, ceramic) and lens type (clear, diffused) are specified. Polarity identification (anode/cathode) is clearly marked in diagrams. This information is vital for PCB layout, pick-and-place machine programming, and thermal modeling.

5. Application Guidelines and Reliability

5.1 Soldering and Handling Recommendations

LEDs are sensitive to heat and electrostatic discharge (ESD). The datasheet provides strict guidelines for soldering profiles, including peak temperature, time above liquidus, and ramp-up/ramp-down rates for reflow processes. Recommendations for handling, storage (often in moisture-sensitive dry packs), and ESD precautions (using grounded workstations) are standard to prevent damage during assembly.

5.2 Reliability and Lifetime Data

A key metric for LEDs is Lumen Maintenance, expressed as L70, L80, etc., indicating the number of operating hours before the light output depreciates to 70% or 80% of its initial value. This is typically presented in a graph and is highly dependent on the drive current and junction temperature. The document may also specify test conditions for reliability under temperature cycling, humidity, and other environmental stresses.

6. Design Considerations and Typical Applications

6.1 Circuit Design Implications

Designing with LEDs requires careful consideration of the drive method. A constant current source is generally preferred over a constant voltage source with a series resistor for stability and efficiency, especially for medium- to high-power LEDs. The driver circuit must be designed to operate within the LED's absolute maximum ratings for current and reverse voltage. Thermal design on the PCB, using adequate copper area or a metal-core board, is necessary to keep the junction temperature low and ensure long life.

6.2 Application Scenarios

LEDs with a stable, long-life specification as indicated by this document are suitable for applications where reliability and maintenance-free operation are critical. These include:

• General Lighting: Bulbs, downlights, panel lights.
• Automotive Lighting: Interior lighting, signal lights (requires specific automotive-grade qualifications).
• Consumer Electronics: Backlighting for displays, indicator lights.
• Industrial and Architectural Lighting: Where long service intervals are demanded.

7. Interpretation of Repeated Data and Document Structure

The repetition of the \"LifecyclePhase:Revision : 2\" line in the provided content is likely an artifact of the PDF's internal data structure or a display/export issue. In a properly formatted technical document, this core identification block would appear once, typically in a header or footer on each page, or in a dedicated revision history table. The presence of numerous black square symbols (\"\u25ae\") further suggests potential corruption or non-text elements in the original PDF. The substantive technical content of the full datasheet would follow this administrative header, containing the detailed sections on parameters, graphs, and application notes as outlined above.

8. Conclusion and Usage Note

This document, representing Revision 2 released in May 2014 with permanent validity, serves as the authoritative source for the technical specifications of the associated LED component. Engineers and designers must use this revision for all new designs and reference it for existing products to ensure performance, reliability, and regulatory compliance. The \"Forever\" expiry underscores the component's maturity and suitability for long-lifecycle products. For any application, consulting the complete datasheet--including all absolute maximum ratings, typical performance curves, and application warnings--is mandatory prior to circuit design and implementation.