White LED SMD 3030 Specification - 3.0x3.0x0.55mm - 3.1V - 1.0W - Automotive Grade - English Technical Document

1. Product Overview

This document details the specifications for a high-performance white Surface-Mount Device (SMD) Light Emitting Diode (LED) designed for demanding applications. The product is constructed using a blue LED chip combined with a phosphor coating to produce white light, encapsulated in a robust Epoxy Molding Compound (EMC) package. Its primary design focus is reliability and performance in automotive environments, adhering to stringent industry qualification standards.

1.1 Core Advantages and Target Market

The LED's key advantages stem from its package and performance characteristics. The EMC package offers superior thermal management and long-term reliability compared to traditional plastics, which is critical for maintaining light output and lifespan. With an extremely wide 120-degree viewing angle, it provides excellent spatial light distribution. It is fully compatible with standard Surface-Mount Technology (SMT) assembly processes, including reflow soldering, and is supplied on tape and reel for automated placement. Its primary target market is automotive lighting, encompassing both interior (e.g., dashboard backlighting, ambient lighting) and exterior (e.g., daytime running lights, signal lights, auxiliary lighting) applications. Compliance with RoHS, REACH, and the AEC-Q102 stress test qualification for automotive-grade discrete semiconductors underscores its suitability for this sector.

2. In-Depth Technical Parameter Analysis

Understanding the electrical, optical, and thermal parameters is essential for proper circuit design and thermal management.

2.1 Photometric and Electrical Characteristics

All parameters are specified at a junction temperature (Tj) of 25°C. The primary operating condition is a forward current (IF) of 300mA.

• Forward Voltage (VF): The typical voltage drop across the LED is 3.1V, with a specified range from 2.8V (Min) to 3.4V (Max). This parameter is binned for production consistency.
• Luminous Flux (Φ): The typical light output is 85 lumens (lm), ranging from a minimum of 75.3 lm to a maximum of 93.2 lm. This flux is also subject to a binning process.
• Viewing Angle (2θ1/2): The angle at which luminous intensity is half of the peak intensity is 120 degrees, providing a very broad emission pattern.
• Reverse Current (IR): With a reverse voltage (VR) of 5V applied, the leakage current is a maximum of 10 µA.

2.2 Absolute Maximum Ratings and Thermal Management

Operating beyond these limits may cause permanent damage.

• Power Dissipation (PD): Maximum allowable power dissipation is 1428 mW.
• Forward Current (IF): The maximum continuous forward current is 420 mA.
• Peak Forward Current (IFP): For pulsed operation (1/10 duty cycle, 10ms pulse width), the device can handle a peak current of 700 mA.
• Reverse Voltage (VR): The maximum allowable reverse voltage is 5V.
• Electrostatic Discharge (ESD): The Human Body Model (HBM) rating is 8000V, with a yield over 90% at this level. Proper ESD handling precautions are still required.
• Temperature Ratings:
  • Operating Temperature (TOPR): -40°C to +125°C.
  • Storage Temperature (TSTG): -40°C to +125°C.
  • Maximum Junction Temperature (TJ): 150°C.
• Thermal Resistance (RθJ-S): The junction-to-solder point thermal resistance is a maximum of 16 °C/W. This value is crucial for calculating the temperature rise of the LED junction under operating conditions. The actual maximum operating current must be determined by measuring the package temperature to ensure the junction temperature does not exceed 150°C.

3. Binning System Explanation

To ensure consistency in production runs, LEDs are sorted into bins based on key parameters.

3.1 Forward Voltage and Luminous Flux Binning

At a test current of IF=300mA, the devices are classified into bins for both forward voltage (VF) and luminous flux (Φ).

• Voltage Bins (VF): Codes range from G1 (2.8-2.9V) to I2 (3.3-3.4V).
• Flux Bins (Φ): Codes are QA (67.8-75.3 lm), QB (75.3-83.7 lm), and RA (83.7-93.2 lm).

A specific product order will combine a voltage bin code with a flux bin code (e.g., H1-QB).

3.2 Chromaticity Binning

The white color point is defined within the CIE 1931 chromaticity diagram. The specified bin, for example '5E', is defined by a quadrilateral on the diagram with coordinates (x1,y1), (x2,y2), (x3,y3), and (x4,y4). All units from this bin will have a color point falling within this defined region, ensuring color uniformity. The tolerance for color coordinate measurement is ±0.005.

4. Mechanical and Packaging Information

4.1 Package Dimensions and Layout

The LED has a compact footprint measuring 3.0mm in length, 3.0mm in width, and 0.55mm in height (typical). Detailed dimensional drawings include top, side, and bottom views. The bottom view clearly shows the anode and cathode pad layout for correct electrical connection. A recommended solder pad pattern (land pattern) is provided to ensure reliable soldering and proper thermal connection to the printed circuit board (PCB). All dimensional tolerances are ±0.2mm unless otherwise noted.

4.2 Packaging Specifications

The product is supplied in industry-standard packaging for automated assembly.

• Carrier Tape: The LEDs are housed in embossed carrier tape. The tape dimensions (pocket size, pitch, etc.) are specified to be compatible with standard SMT pick-and-place equipment.
• Reel: The carrier tape is wound onto a reel. Reel dimensions (diameter, width, hub size) are provided.
• Moisture Sensitivity: The device is rated at Moisture Sensitivity Level (MSL) 2. This means it can be exposed to factory floor conditions (≤30°C/60% RH) for up to one year. If the original dry-bag packaging is opened, the components must be used within 168 hours unless stored under controlled dry conditions (<10% RH).
• Label and Carton: Specifications for the reel label and the final shipping cardboard box are defined.

5. Soldering and Assembly Guidelines

5.1 SMT Reflow Soldering Instructions

A dedicated section provides instructions for the reflow soldering process. This typically includes a recommended reflow temperature profile, specifying key parameters like preheat temperature and time, peak temperature, and time above liquidus. Adhering to this profile is critical to avoid thermal damage to the LED package or the internal die and wire bonds. The maximum temperature the body of the LED should be exposed to is usually specified.

5.2 Handling Precautions

Important precautions must be observed to prevent damage:

• ESD Protection: Although rated for 8000V HBM, standard ESD controls (grounded workstations, wrist straps) should be used during handling.
• Mechanical Stress: Avoid applying mechanical force or vibration directly to the LED lens.
• Contamination: Keep the LED surface clean. Avoid touching the lens with bare hands or exposing it to solvents that may damage the silicone or epoxy.
• Current Control: Always drive the LED with a constant current source, not a constant voltage source, to prevent thermal runaway. Ensure the maximum junction temperature is not exceeded by considering the thermal resistance and operating power.
• Storage: After the moisture barrier bag is opened, follow MSL 2 guidelines. Store unused parts in a dry cabinet if not used within 168 hours.

6. Reliability and Testing

The product undergoes a series of reliability tests based on AEC-Q102 guidelines. The test plan includes items such as High Temperature Operating Life (HTOL), Temperature Cycling (TC), High Temperature High Humidity Reverse Bias (H3TRB), and others. Specific test conditions (temperature, duration, bias) and sample sizes are defined. Criteria for judging failure after testing are also specified, which may include limits on changes in forward voltage, luminous flux, or the appearance of catastrophic failures.

7. Application Suggestions and Design Considerations

7.1 Typical Application Scenarios

The primary application is automotive lighting, leveraging its AEC-Q102 qualification, wide temperature range, and robust package.

• Exterior Lighting: Daytime Running Lights (DRLs), position lights, turn signals, center high-mount stop lights (CHMSL), and interior lighting such as dashboard backlighting, switch illumination, and ambient lighting.
• General Lighting: Can be used in other applications requiring a reliable, high-brightness SMD LED with a wide beam angle.

7.2 Design Considerations

• Thermal Design: The most critical aspect. Use the thermal resistance (16 °C/W max) and power dissipation (VF * IF) to calculate the temperature rise from the solder point to the junction (ΔTj = RθJ-S * PD). Ensure the PCB has adequate thermal vias and copper area to dissipate heat and keep Tj below 150°C. Actively monitor the pad temperature during design validation.
• Optical Design: The 120° viewing angle is inherent to the package. For secondary optics (lenses, reflectors), this wide emission pattern serves as the input. Consider the color binning to maintain consistent color across multiple LEDs in an array.
• Electrical Design: Use a constant-current driver circuit. Account for the forward voltage binning range when designing the driver's compliance voltage. Include reverse polarity protection if the LED could be subjected to reverse voltage.

8. Frequently Asked Questions (Based on Technical Parameters)

Q: Can I drive this LED at its maximum continuous current of 420mA?

A: You can, but only if your thermal design is sufficient to keep the junction temperature below 150°C. At 420mA and a typical VF of 3.1V, the power is about 1.3W. With a thermal resistance of 16°C/W, the temperature rise from the solder point would be ~21°C. If the PCB pad temperature is 80°C, the junction would be at 101°C, which is acceptable. However, if the pad temperature is higher, the junction may exceed its limit. Always calculate based on your specific application's thermal conditions.

Q: What is the difference between the 'Typical' and 'Binned' values for flux and voltage?

A: The 'Typical' value (e.g., 85 lm) is a central, expected value from the production distribution. The 'Binned' ranges (e.g., QA, QB, RA) are the actual sorted groups you can purchase. When ordering, you select a specific bin (or combination of VF and Flux bins) to guarantee the parameters of the delivered parts fall within those narrower, defined ranges for better consistency in your product.

Q: The MSL is Level 2. What does this mean for my production process?

A: MSL 2 means the components can be on the factory floor (≤30°C/60% RH) for up to one year in their sealed bag. Once the bag is opened, you have 168 hours (1 week) to complete soldering before the parts absorb too much moisture, which could cause popcorning (package cracking) during reflow. If you need more time, store the opened reels in a dry cabinet with <10% relative humidity.

9. Operating Principle and Technology Trends

9.1 Basic Operating Principle

This is a phosphor-converted white LED. The core is a semiconductor die that emits blue light when electrical current passes through it (electroluminescence). This blue die is coated with a layer of yellow (or a mix of red and green) phosphor. Part of the blue light is absorbed by the phosphor and re-emitted as longer wavelength yellow/red light. The combination of the remaining blue light and the converted yellow/red light appears white to the human eye. The exact shade of white (cool, neutral, warm) is determined by the composition and thickness of the phosphor layer.

9.2 Industry Trends

The use of EMC packages for mid-power LEDs, as seen in this product, represents a significant trend towards improved reliability and higher power density. EMC materials offer better resistance to heat and UV radiation than traditional PPA or PCT plastics, leading to less lumen depreciation and color shift over time. The push for AEC-Q102 qualification across automotive LED suppliers is standardizing reliability expectations. Furthermore, there is a continuous drive for higher luminous efficacy (more lumens per watt), tighter color consistency (smaller binning areas on the CIE diagram), and improved thermal performance to allow for higher drive currents in smaller form factors.