ALFS3H-C010001H-AM LED Datasheet - SMD Ceramic Package - Luminous Flux 1350lm - Forward Voltage 9.9V - Viewing Angle 120° - English Technical Document

1. Product Overview

The ALFS3H-C010001H-AM is a high-power light-emitting diode (LED) designed primarily for demanding automotive exterior lighting applications. It is housed in a robust Surface-Mount Device (SMD) ceramic package, which offers excellent thermal management and reliability under harsh environmental conditions. The core advantage of this component lies in its combination of high luminous output, wide viewing angle, and adherence to stringent automotive-grade qualifications, making it a suitable choice for safety-critical lighting functions.

The target market is exclusively the automotive industry, with specific applications including headlamps, daytime running lights (DRL), and fog lamps. These applications require components that can maintain consistent performance across a wide temperature range, withstand high levels of electrical stress, and resist corrosive elements like sulfur, all of which are addressed in this product's specifications.

2. Technical Parameters Deep Dive

2.1 Photometric and Electrical Characteristics

The key performance metrics are defined under a standard test condition of a forward current (I_F) of 1000mA. The typical luminous flux (Φ_v) is 1350 lumens (lm), with a minimum of 1200 lm and a maximum of 1500 lm, subject to a measurement tolerance of ±8%. This high light output is essential for providing sufficient illumination in automotive forward lighting.

The forward voltage (V_F) at 1000mA is typically 9.90V, ranging from a minimum of 8.70V to a maximum of 11.40V (±0.05V tolerance). This parameter is crucial for driver circuit design, as it determines the power supply requirements and thermal dissipation needs. The device features a wide viewing angle (φ) of 120 degrees (±5° tolerance), ensuring a broad and uniform light distribution pattern suitable for various lamp designs.

The correlated color temperature (CCT) falls within a range of 5391K to 6893K, classifying it as a cool white LED. The product is qualified according to the AEC-Q102 standard for discrete optoelectronic semiconductors in automotive applications, ensuring reliability. It also boasts sulfur robustness classified as A1, making it resistant to sulfur-containing atmospheres common in some automotive environments. Furthermore, it complies with RoHS, REACH, and halogen-free regulations (Br <900 ppm, Cl <900 ppm, Br+Cl < 1500 ppm).

2.2 Absolute Maximum Ratings and Thermal Characteristics

To ensure device longevity, operating conditions must never exceed the Absolute Maximum Ratings. The maximum continuous forward current is 1500 mA. The device is not designed for reverse voltage operation. The maximum junction temperature (T_J) is 150°C. The allowable operating and storage temperature range is from -40°C to +125°C, covering the extreme conditions encountered in automotive environments. The device can withstand an ESD (HBM, R=1.5kΩ, C=100pF) of up to 8 kV and a reflow soldering temperature of 260°C.

Thermal management is critical for high-power LEDs. The thermal resistance from the junction to the solder point is specified in two ways: the real thermal resistance (R_{th JS real}) is typically 2.3 K/W (max 2.7 K/W), while the electrical method thermal resistance (R_{th JS el}) is typically 1.6 K/W (max 2.0 K/W). A lower thermal resistance indicates better heat transfer from the LED chip to the printed circuit board (PCB), which is vital for maintaining performance and lifespan.

3. Binning System Explanation

To manage production variations and allow for precise design, the LEDs are sorted into bins based on key parameters.

3.1 Luminous Flux Binning

Luminous flux is grouped under a main 'Group E'. Within this group, bins are defined by number:

• Bin 3: 1200 lm to 1275 lm
• Bin 4: 1275 lm to 1350 lm
• Bin 5: 1350 lm to 1425 lm
• Bin 6: 1425 lm to 1500 lm

3.2 Forward Voltage Binning

Forward voltage is binned to ensure consistent electrical behavior in an array. The bins are:

• Bin 3A: 8.70V to 9.60V
• Bin 3B: 9.60V to 10.50V
• Bin 3C: 10.50V to 11.40V

3.3 Color (Chromaticity) Binning

The color coordinates (CIE x, CIE y) are binned to ensure color consistency, which is especially important in multi-LED assemblies. The datasheet provides a detailed chart and table for cool white bins including 56M, 58M, 61M, 63M, 65L, and 65H. Each bin defines a small quadrilateral area on the CIE 1931 chromaticity diagram. The measurement tolerance for color coordinates is ±0.005.

4. Performance Curve Analysis

The datasheet includes several graphs depicting the LED's behavior under different conditions.

4.1 Wavelength Characteristics

The Relative Spectral Distribution graph shows the light output as a function of wavelength. It typically peaks in the blue region (around 450-455nm) and has a broad secondary peak in the yellow region due to the phosphor conversion, characteristic of white LEDs.

4.2 Forward Current vs. Forward Voltage (I-V Curve)

This graph shows the non-linear relationship between current and voltage. As forward current increases from 50mA to 1500mA, the forward voltage increases from approximately 7.5V to 10.5V. This curve is essential for designing the constant-current driver.

4.3 Relative Luminous Intensity vs. Forward Current

This graph demonstrates that light output increases with current but not linearly. The relative flux is normalized to the value at 1000mA. It shows sub-linear increase at higher currents, indicating reduced efficacy due to increased heat and droop effects.

4.4 Thermal Performance Graphs

Several graphs show the impact of temperature:

• Relative Forward Voltage vs. Junction Temperature: The forward voltage decreases linearly as junction temperature increases, with a negative temperature coefficient. This property can sometimes be used for temperature sensing.
• Relative Luminous Intensity vs. Junction Temperature: Light output decreases as temperature rises. At 125°C, the output may be only about 85-90% of its value at 25°C.
• Chromaticity Shift vs. Junction Temperature: The color coordinates (CIE x, CIE y) shift slightly with temperature, which is important for color-critical applications.
• Forward Current Derating Curve: This is a critical graph for reliability. It shows the maximum allowable forward current as a function of the solder pad temperature (T_S). For example, at T_S = 110°C, the maximum I_F is 1500mA. At T_S = 125°C, the maximum I_F drops to 1200mA. The device should not be operated below 50mA.

5. Mechanical and Packaging Information

The LED uses an SMD ceramic package. While the exact mechanical dimensions (length, width, height) are not provided in the extracted content, the datasheet includes a dedicated 'Mechanical Dimension' section (Section 7) which would contain a detailed drawing with all critical measurements. Similarly, Section 8 provides a 'Recommended Soldering Pad' layout, which is crucial for PCB design to ensure proper soldering, thermal transfer, and mechanical stability. The polarity is typically indicated by a marking on the package or an asymmetric pad design.

6. Soldering and Assembly Guidelines

Section 9 of the datasheet details the 'Reflow Soldering Profile'. This profile specifies the time-temperature requirements for soldering the component onto a PCB using a reflow oven. Adhering to this profile is essential to prevent thermal damage to the LED chip, phosphor, or package. Key parameters usually include preheat temperature and time, peak temperature (max 260°C as per absolute ratings), and time above liquidus. Section 11, 'Precaution for Use', likely contains important handling, storage, and cleaning instructions to avoid electrostatic discharge (ESD) damage or contamination.

7. Packaging and Ordering Information

Section 10, 'Packaging Information', describes how the LEDs are supplied (e.g., on tape and reel), including reel dimensions and component orientation. Section 5 and 6 cover 'Part Number' and 'Ordering Information'. The part number ALFS3H-C010001H-AM follows a specific coding system that likely encapsulates key attributes like flux bin, voltage bin, and color bin. Understanding this nomenclature is necessary for specifying the exact product variant required for a design.

8. Application Suggestions

8.1 Typical Application Scenarios

As listed, the primary applications are:

• Headlamp: Used in low-beam, high-beam, or adaptive driving beam systems. The high flux and robustness are key.
• Daytime Running Light (DRL): Requires high efficiency and reliability for constant daytime operation.
• Fog Lamp: Demands good performance in moisture and corrosive environments; the sulfur robustness is beneficial here.

8.2 Design Considerations

• Thermal Design: The most critical aspect. Use the thermal resistance (R_{th JS}) and derating curve to design an adequate heatsinking solution on the PCB (using thermal vias, copper pours) and possibly a secondary heatsink to keep the solder pad temperature as low as possible, preferably below 85-100°C for optimal performance and lifetime.
• Electrical Design: Implement a constant-current driver suitable for the typical V_F (~9.9V) and desired I_F. Consider using LEDs from the same voltage bin if connecting in parallel. Provide protection against reverse polarity and voltage transients.
• Optical Design: The 120° viewing angle provides a good starting point for secondary optics (lenses, reflectors) designed to shape the beam for specific applications like a headlamp cutoff pattern.
• Sulfur Resistance: For applications in environments with high sulfur content (e.g., near industrial areas, certain geographic locations), the Class A1 sulfur robustness ensures longer-term reliability by preventing silver corrosion on the package leads.

9. Technical Comparison and Differentiation

While a direct side-by-side comparison with other products is not provided, the key differentiating advantages of this LED can be inferred from its specifications:

• Automotive Grade (AEC-Q102): Not all high-power LEDs undergo this rigorous qualification, which includes extended temperature cycling, high-temperature operating life (HTOL), and other stress tests.
• Ceramic Package: Offers superior thermal conductivity and long-term stability compared to plastic packages, especially under high-temperature and high-humidity conditions.
• Sulfur Robustness (Class A1): A specific feature addressing a known failure mode in automotive and industrial environments, not commonly specified for general-purpose LEDs.
• High Luminous Flux in a Single Package: Delivering 1350+ lm simplifies optical design compared to using multiple lower-power LEDs, potentially reducing part count and cost.

10. Frequently Asked Questions (Based on Technical Parameters)

Q: What driver current should I use?

A: The typical test current is 1000mA, and the maximum continuous current is 1500mA. The operating current should be chosen based on the required light output and the thermal design's ability to keep the junction temperature within safe limits, using the derating curve as a guide. A common operating point is between 700mA and 1000mA for a balance of output and efficiency.

Q: How do I interpret the luminous flux binning?

A: If you order Bin 4, you are guaranteed that the LED will have a luminous flux between 1275 lm and 1350 lm when measured at 1000mA and 25°C on the thermal pad. This allows you to design for a minimum light output in your system.

Q: Why is thermal resistance specified in two ways (real and electrical)?

A: The 'real' thermal resistance is measured using a physical temperature sensor. The 'electrical' method uses the LED's own forward voltage temperature coefficient as a sensor, which can be more practical for in-situ measurement. For design purposes, the 'real' value is typically used for heatsink calculations.

Q: Can I use this LED for interior lighting?

A: While technically possible, it is over-specified and likely not cost-effective. Its high power, robust package, and automotive qualifications are tailored for the harsh exterior environment. Interior lighting typically uses lower-power, cost-optimized LEDs.

11. Practical Design Case Study

Consider designing a daytime running light (DRL) module. The design goal is 500 lumens per module with high reliability. Using the ALFS3H-C010001H-AM LED from Bin 4 (min 1275 lm), a single LED driven at 400mA (where relative flux is ~0.4 per the graph) would yield approximately 510 lm. This simplifies the design to a single emitter. The thermal design must ensure the solder pad temperature remains below, for example, 90°C. Using the thermal resistance (R_{th JS real} = 2.3 K/W) and estimating power dissipation at 400mA and ~9.5V (from I-V curve) as 3.8W, the temperature rise from pad to junction is ~8.7°C. If the target junction temperature is 110°C, the maximum allowable pad temperature is 101.3°C, which is above our 90°C target, providing a good safety margin. A constant-current driver set to 400mA ±5% would be used.

12. Operating Principle Introduction

A white LED like the ALFS3H-C010001H-AM operates on the principle of electroluminescence in a semiconductor and phosphor conversion. The core is a chip made of indium gallium nitride (InGaN) that emits blue light when a forward current is applied across its p-n junction (electroluminescence). This blue light then strikes a layer of yellow (or yellow and red) phosphor coating on or near the chip. The phosphor absorbs a portion of the blue light and re-emits it as a broader spectrum of longer wavelengths (yellow, red). The mixture of the remaining blue light and the phosphor-converted yellow/red light is perceived by the human eye as white light. The exact proportions determine the correlated color temperature (CCT).

13. Technology Trends

The development of high-power automotive LEDs follows several clear trends:

• Increased Luminous Efficacy (lm/W): Ongoing improvements in chip design, phosphor technology, and package efficiency aim to produce more light per watt of electrical input, reducing energy consumption and thermal load.
• Higher Power Density and Flux per Package: Enabling brighter headlights and more compact lamp designs.
• Advanced Beam Shaping with Integrated Optics: Moving towards LEDs with built-in micro-optics or lens arrays to create specific beam patterns directly, simplifying the external optical system.
• Smart and Adaptive Lighting: Integration with sensors and control systems for adaptive driving beams (ADB) that can selectively dim parts of the beam to avoid glaring other drivers while maintaining maximum illumination elsewhere. This often involves multi-pixel or matrix LED designs.
• Enhanced Reliability and Robustness: Continued focus on improving longevity and resistance to extreme temperatures, humidity, vibration, and chemical exposure, as evidenced by features like sulfur-resistant packages.