LED Specification - 3.0x1.4x0.52mm - 2.8-3.3V - White - 0.66W - Technical Document

1. Product Overview

This technical document details the specifications for a high-performance white light-emitting diode (LED) designed primarily for automotive lighting systems. The product leverages a blue chip combined with a phosphor conversion system to produce white light, offering a robust solution for demanding environments.

1.1 General Description

The LED is a surface-mount device (SMD) constructed using an Epoxy Molding Compound (EMC) package. This package material offers superior thermal stability and resistance to environmental stressors compared to traditional plastics, which is critical for automotive applications. The core technology involves a blue semiconductor chip that excites a yellow phosphor layer, resulting in the emission of white light. The compact physical footprint measures 3.00mm in length, 1.40mm in width, and 0.52mm in height, making it suitable for space-constrained designs.

1.2 Core Features and Advantages

• EMC Package: Provides excellent thermal conductivity, long-term reliability under high-temperature conditions, and superior resistance to moisture and ultraviolet (UV) radiation.
• Extremely Wide Viewing Angle: Features a typical half-intensity angle (2θ1/2) of 120 degrees, ensuring uniform light distribution and eliminating hotspots in lighting assemblies.
• SMT Process Compatibility: Fully compatible with standard surface-mount technology (SMT) assembly and reflow soldering processes, enabling high-volume, automated production.
• Moisture Sensitivity: Rated at Moisture Sensitivity Level (MSL) 2, requiring the component to be baked if exposed to ambient conditions for more than one year prior to reflow soldering.
• Environmental Compliance: Compliant with the Restriction of Hazardous Substances (RoHS) directive.
• Automotive Qualification: The product qualification testing follows the stringent guidelines of AEC-Q102, the stress test qualification standard for automotive-grade discrete optoelectronic semiconductors.

1.3 Target Application Market

The primary application domain for this LED is automotive lighting. Its robust construction and performance parameters make it ideal for both interior lighting (e.g., dashboard backlighting, ambient lighting, switch illumination) and exterior lighting applications (e.g., daytime running lights (DRL), side marker lights, interior dome lights, and other signal functions). The AEC-Q102 compliance is a key indicator of its suitability for the harsh operating environments encountered in vehicles, including wide temperature swings and vibration.

2. In-Depth Technical Parameter Analysis

This section provides a detailed, objective interpretation of the key electrical, optical, and thermal parameters specified for the device, measured at a standard solder point temperature (Ts) of 25°C.

2.1 Electrical and Optical Characteristics

The fundamental performance metrics define the operational envelope of the LED.

• Forward Voltage (V_F): At a test current (I_F) of 140mA, the forward voltage ranges from a minimum of 2.8V to a maximum of 3.3V, with a typical value of 3.05V. This parameter is crucial for driver circuit design, as it determines the power supply requirements and influences overall system efficiency. The specified measurement tolerance is ±0.1V.
• Luminous Flux (Φ): The total visible light output at 140mA is specified between 45.3 lumens (min) and 61.2 lumens (max). This wide range is managed through a binning system (detailed later). The measurement tolerance for luminous flux is ±10%, which designers must account for in optical system calculations to ensure consistent light output across production batches.
• Viewing Angle (2θ_1/2): The typical value is 120 degrees. This wide beam angle is beneficial for applications requiring broad, even illumination rather than a focused spot.
• Reverse Current (I_R): With a reverse voltage (V_R) of 5V applied, the maximum leakage current is 10 μA. This is a standard protection rating.
• Photoelectric Conversion Efficiency (η_e): Under pulsed testing conditions at 25°C, the efficiency is reported as 41%. This metric indicates the effectiveness of converting electrical power into optical power.

2.2 Absolute Maximum Ratings and Thermal Characteristics

These ratings define the stress limits beyond which permanent damage may occur. Operation should always be within these limits.

• Power Dissipation (P_D): The maximum allowable power dissipation is 660 mW. Exceeding this limit risks overheating and accelerated degradation.
• Forward Current (I_F): The maximum continuous forward current is 200 mA.
• Peak Forward Current (I_FP): A peak current of 350 mA is permitted under pulsed conditions (specified as 1/10 duty cycle, 10 ms pulse width).
• Operating and Storage Temperature: The device is rated for an ambient temperature range of -40°C to +125°C, suitable for global automotive use.
• Junction Temperature (T_J): The maximum allowable temperature at the semiconductor junction is 150°C. This is the ultimate limit for reliable operation.
• Thermal Resistance (R_th): Two values are provided:
  • R_{th JS real} (Junction to Solder point, real condition): Typical 34 °C/W, Max 43 °C/W. This represents the thermal path in a practical mounting scenario.
  • R_{th JS el} (Junction to Solder point, electrical method): Typical 20 °C/W, Max 25 °C/W. This is a measured value under specific test conditions (I_F=140mA, 25°C ambient).
  These values are critical for thermal management design. The lower the thermal resistance, the more efficiently heat is transferred away from the junction, allowing for higher drive currents or improved longevity. Designers must ensure that the actual operating junction temperature, calculated using these R_th values and the applied power, does not exceed the maximum T_J of 150°C.

3. Bin Sorting System Explanation

To ensure consistency in application performance, LEDs are sorted (binned) based on key parameters measured during production.

3.1 Forward Voltage and Luminous Flux Binning

The provided binning table (Table 1-3) categorizes the LEDs based on two primary parameters at I_F = 140mA.

• Forward Voltage (V_F) Bins: Labeled G1, G2, H1, H2, I1, corresponding to voltage ranges from 2.8-2.9V up to 3.2-3.3V. This allows designers to select LEDs with tighter voltage tolerances for driver circuits requiring precise voltage matching.
• Luminous Flux (Φ) Bins: Labeled OA, OB, PA, corresponding to flux ranges from 45.3-50 lm, 50-55.3 lm, and 55.3-61.2 lm, respectively. Selecting from a specific flux bin guarantees a known minimum light output, which is essential for meeting the brightness requirements of a lighting module.

The binning matrix indicates which voltage and flux bin combinations are available (e.g., G1-OA, G1-OB, G1-PA, etc.). This system enables procurement of components with predictable and matched performance, reducing variability in the final product's light output and color consistency.

4. Performance Curve Analysis

While specific graphical data is referenced (Typical Optical Characteristics Curves), the datasheet implies standard relationships that are foundational to LED behavior.

4.1 Current vs. Voltage (I-V) Characteristic

Like all diodes, the LED exhibits an exponential I-V relationship. The forward voltage increases logarithmically with current. The specified V_F at 140mA provides a key operating point. Designers should expect the voltage to be slightly lower at lower currents and higher near the maximum rated current.

4.2 Luminous Flux vs. Forward Current (L-I Curve)

The light output is generally proportional to the forward current within the operating range. However, efficiency (lumens per watt) typically decreases at very high currents due to increased heat generation (efficiency droop). The specified flux at 140mA is the reference point.

4.3 Luminous Flux vs. Junction Temperature

This is a critical relationship for automotive applications. As the junction temperature (T_J) increases, the luminous output of an LED decreases. The rate of this decrease is characterized by a temperature coefficient. While not explicitly stated here, the wide operating temperature range (-40°C to +125°C) necessitates that thermal management in the application must control T_J to maintain stable light output over the vehicle's lifetime.

4.4 Spectral Characteristics and CIE Chromaticity

The product is a white LED, implying a spectral power distribution (SPD) that combines a blue peak from the chip and a broader yellow peak from the phosphor. The CIE 1931 chromaticity diagram is referenced, which plots the color coordinates (x, y) of the emitted white light. The specific target color temperature (e.g., cool white, neutral white) and its allowable variance (binning) would typically be defined within this diagram to ensure color consistency between different LEDs in an array.

5. Mechanical and Package Information

5.1 Package Dimensions and Tolerances

The mechanical drawing specifies the exact footprint and profile. Key dimensions include the overall size (3.00 x 1.40 x 0.52 mm), the cathode/anode pad spacing (1.60 mm typical between centers), and the standoff height. All dimensions are in millimeters, with a general tolerance of ±0.2 mm unless otherwise noted.

5.2 Recommended Pad Layout and Polarity Identification

A recommended land pattern (footprint) for PCB design is provided. This pattern is crucial for achieving reliable solder joints and proper alignment during reflow. The document clearly indicates the polarity: one pad is designated for the anode (+) and the other for the cathode (-). Correct polarity must be observed during assembly to prevent damage to the LED.

6. Soldering and Assembly Guidelines

6.1 SMT Reflow Soldering Instructions

The LED is designed for compatibility with standard infrared (IR) or convection reflow soldering processes. Adherence to the moisture sensitivity level (MSL 2) is paramount. Components must be stored in dry packaging and, if the dry pack is opened or exposure time exceeds the MSL 2 limit (typically 1 year at ≤30°C/60%RH), they require baking (e.g., at 125°C for 24 hours) before reflow to prevent \"popcorning\" or delamination caused by rapid moisture vaporization.

A standard reflow profile with a peak temperature not exceeding 260°C (for Pb-free solder) is generally applicable. The specific time above liquidus (TAL) and ramp rates should follow the solder paste manufacturer's recommendations and the assembly capabilities of the PCB and other components. The EMC package material provides good resistance to thermal shock during this process.

7. Packaging and Ordering Information

7.1 Packaging Specification

The product is supplied on tape and reel for automated pick-and-place assembly. Specifications include:

• Carrier Tape Dimensions: Details the pocket size and pitch to securely hold the LED during transport and handling.
• Reel Dimensions: Specifies the reel diameter, width, and hub size, which are important for compatibility with SMT placement equipment feeders.
• Label Information: The reel label contains critical information such as part number, quantity, lot code, and date code for traceability.

7.2 Moisture-Resistant and Outer Packaging

The components are packaged in moisture barrier bags (MBB) with desiccant and a humidity indicator card to maintain the MSL 2 rating during storage and shipment. These bags are then packed in cardboard boxes suitable for shipping and handling.

8. Application Recommendations and Design Considerations

Based on the technical parameters, here are key considerations for implementing this LED:

• Current Drive: Use a constant-current driver circuit rather than a constant-voltage source. This ensures stable light output independent of minor variations in the forward voltage (V_F) from LED to LED or with temperature changes.
• Thermal Management: This is the single most critical design factor for reliability and performance. The PCB must be designed to act as a heat sink. Use thermally conductive materials, adequate copper pours under and around the LED pads, and possibly thermal vias to transfer heat to inner layers or a metal core. The maximum drive current should be derated based on the achievable thermal resistance of the PCB assembly to keep T_J well below 150°C.
• Optical Design: The 120-degree viewing angle may require secondary optics (lenses, reflectors) if a more collimated beam is needed. The wide angle is advantageous for backlighting diffuser panels.
• ESD Protection: Although the device has a Human Body Model (HBM) ESD rating of 8000V, standard ESD handling precautions should be followed during assembly to prevent latent damage.

9. Technical Comparison and Differentiation

While a direct competitor comparison is not provided, the key differentiating advantages of this product can be inferred from its specifications:

• Automotive-Grade Reliability (AEC-Q102): This is a significant differentiator from commercial-grade LEDs. It implies rigorous testing for high-temperature operating life (HTOL), temperature cycling, moisture resistance, and other stresses specific to automotive environments.
• EMC Package: Offers better long-term color stability and resistance to yellowing/browning under high-temperature and high-humidity conditions compared to standard plastic packages like PPA or PCT.
• High-Temperature Capability: The 125°C operating temperature rating and 150°C maximum junction temperature exceed the capabilities of many standard LEDs, making it suitable for under-hood or other high-ambient-temperature locations.

10. Frequently Asked Questions (Based on Technical Parameters)

10.1 What is the recommended operating current?

While the absolute maximum continuous current is 200mA, the typical test and specification data is provided at 140mA. This is likely the recommended nominal operating point for balancing light output, efficiency, and long-term reliability. The actual operating current should be determined based on the required lumen output and the effectiveness of the thermal management system.

10.2 How do I select the right bin for my application?

If your driver circuit is sensitive to voltage variation (e.g., a simple series resistor limit), select a tighter V_F bin (e.g., G1 or G2). For applications requiring consistent brightness, specify a luminous flux bin (OA, OB, or PA) that guarantees your minimum required light output. Often, a combination bin (e.g., G1-PA) is specified to control both parameters.

10.3 Can I drive this LED with a 12V automotive battery directly?

No. Connecting the LED directly to a 12V source would cause a catastrophic overcurrent failure. You must use an appropriate current-limiting circuit. This could be a linear constant-current driver, a switching regulator (LED driver IC), or for simple applications, a series resistor calculated based on the LED's V_F at the desired current and the supply voltage, accounting for voltage fluctuations in the vehicle's electrical system.

11. Practical Application Case Studies

11.1 Automotive Interior Ambient Lighting

An array of these LEDs can be mounted on a flexible PCB and placed behind a translucent trim panel. The wide 120-degree beam angle ensures even backlighting of the panel without dark spots. The AEC-Q102 qualification ensures the lights will withstand the temperature extremes inside a car parked in the sun or in cold climates. The high flux output allows the use of fewer LEDs to achieve the desired ambient light level.

11.2 Exterior Center High-Mount Stop Light (CHMSL)

Multiple LEDs are arranged in a line or pattern. Their high brightness and fast turn-on time make them ideal for brake lights. The robust EMC package ensures resistance to humidity, thermal cycling, and UV exposure from sunlight, maintaining performance and color over the vehicle's lifespan. Careful thermal design of the CHMSL housing is necessary to dissipate heat from the LEDs when illuminated for extended periods.

12. Operating Principle Introduction

The white light generation employs the principle of phosphor-converted white LEDs (pc-LEDs). A semiconductor chip made from materials like indium gallium nitride (InGaN) emits blue light when forward-biased. This blue light is partially absorbed by a layer of cerium-doped yttrium aluminum garnet (YAG:Ce) phosphor coating the chip. The phosphor down-converts the high-energy blue photons into lower-energy photons across a broad spectrum in the yellow region. The combination of the remaining blue light and the emitted yellow light is perceived by the human eye as white light. The exact correlated color temperature (CCT) of the white light (e.g., 5700K cool white) is determined by the ratio of blue to yellow light, which is controlled by the phosphor composition and thickness.

13. Technology Trends and Context

This product sits within the ongoing evolution of LED technology for automotive lighting. Key trends influencing this sector include:

• Increased Efficiency (lm/W): Continuous improvements in chip epitaxy, phosphor efficiency, and package design drive higher lumen output per watt, reducing power consumption and thermal load.
• Miniaturization: The compact 3.0 x 1.4 mm footprint allows for sleeker, more integrated lighting designs. Even smaller packages are emerging for certain applications.
• Improved Color Quality and Consistency: Advancements in phosphor technology and tighter binning processes enable more precise and stable white points, which is critical for multi-LED arrays where color matching is essential.
• Smart Lighting and ADAS Integration: LEDs are becoming enabling components for adaptive front-lighting systems (AFS) and communication via light (Li-Fi or visible light communication). The fast switching capability of LEDs is key here.
• Material Science: The use of EMC and other advanced molding compounds over traditional plastics is a trend driven by the need for higher reliability in harsh environments, directly reflected in this product's specifications.

This LED represents a mature, reliable, and high-performance component aligned with these industry demands, particularly for the rigorous automotive market.