LED Component Datasheet - Lifecycle Revision 2 - Release Date 2014-12-05 - English Technical Document

1. Product Overview

This technical datasheet provides comprehensive information for an LED component, focusing on its lifecycle management and revision history. The primary purpose of this document is to serve as a definitive reference for engineers, designers, and procurement specialists involved in the integration of this component into electronic systems. The core advantage of this component lies in its documented and controlled lifecycle, ensuring consistency and reliability for long-term projects. The target market includes industrial automation, consumer electronics, and general lighting applications where component traceability and version control are critical.

2. Lifecycle and Revision Information

The document consistently indicates a single, stable lifecycle phase for the component. The Lifecycle Phase is specified as Revision, with a value of 2. This denotes that the component is in a revised state, implying updates or improvements from a previous version (Revision 1). The Expired Period is noted as Forever, which suggests this revision of the component has no planned obsolescence date and is intended for indefinite production and support, a crucial factor for long-lifecycle products. The Release Date is precisely recorded as 2014-12-05 12:01:55.0. This timestamp provides essential traceability, allowing users to identify the exact manufacturing batch or documentation set associated with this revision.

3. Technical Parameters Deep Objective Interpretation

While the provided PDF excerpt focuses on administrative data, a complete datasheet for an LED component would typically include the following technical parameter sections, interpreted here for clarity.

3.1 Photometric and Color Characteristics

This section would detail the light output properties. Key parameters include Dominant Wavelength or Correlated Color Temperature (CCT), measured in nanometers (nm) or Kelvins (K), defining the perceived color of the light. Luminous Flux is a critical measure of the total visible light emitted, expressed in lumens (lm). Luminous Intensity, measured in millicandelas (mcd), indicates the brightness in a specific direction. Color Rendering Index (CRI) would be specified for white LEDs, indicating how accurately the light source reveals the true colors of objects.

3.2 Electrical Parameters

This defines the operating conditions for the LED. The Forward Voltage (Vf) is the voltage drop across the LED when current is flowing, typically specified at a given test current (e.g., 20mA, 150mA). It is crucial for driver design. The Forward Current (If) is the recommended continuous operating current. The Reverse Voltage (Vr) indicates the maximum voltage the LED can withstand in the non-conducting direction without damage. Power Dissipation is calculated from Vf and If and is vital for thermal management.

3.3 Thermal Characteristics

LED performance and lifespan are heavily dependent on temperature. The Junction-to-Ambient Thermal Resistance (RθJA), measured in °C/W, quantifies how effectively heat is transferred from the LED chip (junction) to the surrounding environment. A lower value indicates better heat dissipation. The Maximum Junction Temperature (Tj max) is the highest temperature the semiconductor junction can safely endure. Operating below this limit is essential for reliability.

4. Binning System Explanation

Manufacturing variations necessitate a binning system to group LEDs with similar characteristics.

4.1 Wavelength/Color Temperature Binning

LEDs are sorted into bins based on their precise wavelength (for colored LEDs) or CCT (for white LEDs). This ensures color consistency within a single production batch or across multiple batches for a project.

4.2 Luminous Flux Binning

LEDs are categorized according to their measured light output (lumens) at a standard test current. This allows designers to select components that meet specific brightness requirements.

4.3 Forward Voltage Binning

LEDs are grouped by their forward voltage drop. This is important for designing efficient constant-current drivers and for ensuring uniform brightness in parallel LED strings.

5. Performance Curve Analysis

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

5.1 Current vs. Voltage (I-V) Curve

This curve shows the relationship between the forward current and the forward voltage. It is non-linear, demonstrating the diode characteristics. The curve helps in determining the operating point and dynamic resistance.

5.2 Temperature Characteristics

Graphs typically show how luminous flux and forward voltage change with increasing junction temperature. Flux generally decreases as temperature rises (thermal quenching), while forward voltage typically decreases slightly.

5.3 Spectral Power Distribution

This graph plots the relative intensity of light emitted at each wavelength. It defines the color characteristics more precisely than a single wavelength number and is essential for color-critical applications.

6. Mechanical and Package Information

Precise physical specifications are required for PCB design and assembly.

6.1 Dimension Diagram

A detailed mechanical drawing showing all critical dimensions: length, width, height, lens shape, and lead spacing. Tolerances are always specified.

6.2 Pad Layout Design

The recommended copper pad pattern on the PCB for soldering. This includes pad size, shape, and spacing to ensure proper solder joint formation and mechanical stability.

6.3 Polarity Identification

Clear marking of the anode (+) and cathode (-) terminals. This is often indicated by a notch, a cut corner, a green mark, or different lead lengths on the component itself.

7. Soldering and Assembly Guidelines

Proper handling ensures reliability.

7.1 Reflow Soldering Profile

A time-temperature graph specifying the preheat, soak, reflow, and cooling stages. Key parameters include peak temperature (typically 240-260°C max for SnAgCu solder) and time above liquidus (TAL). Exceeding these limits can damage the LED.

7.2 Precautions

Instructions include using ESD protection, avoiding mechanical stress on the lens, not touching the lens with bare hands, and ensuring the soldering iron tip temperature is controlled if hand soldering is necessary.

7.3 Storage Conditions

LEDs should be stored in a dry, dark environment at controlled temperature and humidity, typically in moisture-sensitive device (MSD) bags with desiccant if the package is susceptible to moisture absorption.

8. Packaging and Ordering Information

8.1 Packaging Specifications

Describes the form of delivery: tape and reel (standard for SMD parts), tube, or tray. Details include reel dimensions, pocket spacing, and orientation.

8.2 Labeling Information

Explains the information printed on the packaging label: part number, quantity, date code, lot number, and binning codes.

8.3 Model Numbering Rules

Decodes the part number to identify key attributes like package size, color, flux bin, voltage bin, and special features (e.g., high CRI).

9. Application Recommendations

9.1 Typical Application Scenarios

Based on its implied characteristics from the lifecycle data (stable, long-term), this component is suitable for backlighting units (BLUs) in displays, general indicator lights, automotive interior lighting, and signage where long-term availability is required.

9.2 Design Considerations

Designers must implement proper current limiting, either via a series resistor or a constant-current driver. Thermal management through adequate PCB copper area or a heatsink is critical to maintain light output and longevity. Consider the viewing angle for the application layout.

10. Technical Comparison

Compared to components with a defined End-of-Life (EOL) notice, this component's Forever expired period and stable Revision 2 status represent a significant advantage for products requiring long-term manufacturing support, reducing the risk of last-time buys or costly redesigns.

11. Frequently Asked Questions

Q: What does \"Lifecycle Phase: Revision 2\" mean?

A: It indicates this is the second official version of the component's documentation and specifications. Changes from Revision 1 should be documented in an engineering change notice (ECN).

Q: Does \"Expired Period: Forever\" guarantee the part will never be discontinued?

A: While it indicates no planned obsolescence, manufacturers reserve the right to discontinue products due to unforeseen circumstances like material shortages. However, it signifies a strong commitment to long-term supply.

Q: How should I use the Release Date?

A: Use it to correlate with other documentation, verify you have the latest specs, and for traceability in your own product's revision history.

12. Practical Use Case

An industrial control panel designer selects this LED for status indicators. The \"Forever\" lifecycle ensures the same LED will be available for production and spare parts for the panel's expected 15-year service life. The precise release date allows the manufacturer to track and qualify the specific component batch used in each panel shipment, aiding in quality control and any potential field issue investigations.

13. Principle of Operation

An LED is a semiconductor diode. When a forward voltage is applied across its terminals (anode positive relative to cathode), electrons and holes recombine in the active region of the semiconductor chip. This recombination process releases energy in the form of photons (light). The specific wavelength (color) of the emitted light is determined by the bandgap energy of the semiconductor materials used (e.g., InGaN for blue/green, AlInGaP for red/amber). White LEDs are typically blue LEDs coated with a phosphor layer that converts some blue light to longer wavelengths, creating a broad spectrum perceived as white.

14. Development Trends

The LED industry continues to evolve towards higher efficacy (more lumens per watt), improved color quality (higher CRI and R9 values), and greater reliability. Miniaturization of packages remains a trend for dense applications. There is also significant development in smart lighting, integrating sensors and communication protocols directly with LED modules. Furthermore, the industry is placing increased emphasis on sustainable manufacturing and recyclability. The concept of documented, stable lifecycle phases, as seen in this datasheet, aligns with the industry's move towards greater supply chain transparency and long-term reliability for professional and industrial applications.