ALFS1G-PA10001H-AM LED Datasheet - SMD Ceramic Package - 250lm @1000mA - 3.3V - 120\u00b0 Viewing Angle - English Technical Document

1. Product Overview

The ALFS1G-PA10001H-AM is a high-power LED component designed for demanding automotive applications. It is housed in a robust Surface-Mount Device (SMD) ceramic package, offering superior thermal management and reliability compared to standard plastic packages. The primary target market is automotive exterior lighting, including signaling functions, where consistent performance under harsh environmental conditions is critical.

Its core advantages include a high typical luminous flux of 250 lumens at a drive current of 1000mA, a wide 120-degree viewing angle for excellent light distribution, and compliance with stringent automotive industry standards. The device is qualified according to AEC-Q102, ensuring it meets the rigorous quality and reliability requirements for electronic components in vehicles. Furthermore, it boasts sulfur robustness classified as Class A1, making it resistant to corrosion in environments with high sulfur content, such as those found near industrial areas or with certain fuel types.

The product is also designed with environmental regulations in mind, being compliant with EU REACH, Halogen-Free requirements (Br <900 ppm, Cl <900 ppm, Br+Cl <1500 ppm), and remains within RoHS compliant versions.

2. Technical Parameters Deep Dive

2.1 Photometric and Electrical Characteristics

The key operational parameters are defined under specific test conditions, typically with the thermal pad at 25\u00b0C and using a current pulse time of 25ms. The forward current (I_F) has a wide operating range from a minimum of 50mA up to a maximum of 1500mA, with a typical application point of 1000mA. At this 1000mA drive current, the luminous flux (\u03a6_v) is typically 250 lm, with a minimum of 180 lm and a maximum of 300 lm, subject to a measurement tolerance of \u00b18%.

The forward voltage (V_F) at 1000mA is typically 3.30V, ranging from a minimum of 2.90V to a maximum of 3.80V, with a measurement tolerance of \u00b10.05V. The wide viewing angle of 120\u00b0 (\u00b15\u00b0 tolerance) is a key feature for applications requiring broad illumination. The chromaticity coordinates are specified as CIE x: 0.565 and CIE y: 0.417 under typical conditions.

2.2 Thermal Characteristics

Effective heat dissipation is crucial for LED performance and longevity. The thermal resistance from the junction to the solder point is characterized in two ways: the real thermal resistance (R_{th JS real}) is typically 4.4 K/W (max 5.3 K/W), while the electrical method thermal resistance (R_{th JS el}) is typically 3.3 K/W (max 4.0 K/W). These values indicate the package's efficiency in transferring heat from the LED chip to the printed circuit board (PCB).

3. Absolute Maximum Ratings

These ratings define the limits beyond which permanent damage to the device may occur. The device is not designed for reverse voltage operation. The maximum allowable power dissipation (P_d) is 5700 mW. The absolute maximum forward current is 1500 mA. The junction temperature (T_j) must not exceed 150\u00b0C. The operating and storage temperature range is from -40\u00b0C to +125\u00b0C. The device can withstand Electrostatic Discharge (ESD) of up to 8 kV (Human Body Model, HBM). The maximum soldering temperature during reflow is 260\u00b0C.

4. Performance Curve Analysis

4.1 Spectral and Radiation Characteristics

The relative spectral distribution graph shows the light output as a function of wavelength. This LED emits in the amber color range. The typical radiation pattern diagram illustrates the spatial distribution of light intensity, confirming the 120\u00b0 viewing angle where the intensity drops to half of its peak value.

4.2 Forward Current vs. Forward Voltage (IV Curve)

The graph plotting forward current against forward voltage shows the diode's characteristic exponential relationship. It is essential for designing the driver circuit, as it indicates the voltage required to achieve a desired current. The curve is provided at a solder pad temperature (T_S) of 25\u00b0C.

4.3 Relative Luminous Flux vs. Forward Current

This graph demonstrates how light output increases with drive current. It shows a sub-linear relationship, meaning efficiency (lumens per watt) typically decreases at higher currents due to increased heat generation.

4.4 Temperature Dependence

Several graphs detail the LED's performance variation with temperature. The relative luminous flux vs. junction temperature graph shows light output decreasing as temperature rises, a common phenomenon known as thermal droop. The relative forward voltage vs. junction temperature graph shows V_F decreasing linearly with increasing temperature, which can be used for temperature sensing. The chromaticity coordinates shift slightly with both forward current and junction temperature, which is important for color-critical applications.

4.5 Forward Current Derating Curve

This is a critical graph for thermal design. It plots the maximum allowable forward current against the solder pad temperature. As the pad temperature increases, the maximum safe current decreases to prevent the junction temperature from exceeding its 150\u00b0C limit. For example, at a pad temperature of 110\u00b0C, the maximum current is 1500mA, but at 125\u00b0C, it derates to 1100mA. The curve also specifies that the device should not be operated below 50mA.

5. Binning System Explanation

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

5.1 Luminous Flux Binning

For the cool white variant (though the main part appears to be amber), luminous flux bins are defined from Group B5 (180-200 lm) to B10 (280-300 lm) at the typical test current. The measurement tolerance is \u00b18%.

5.2 Forward Voltage Binning

Forward voltage is binned into three groups: 1A (2.90V - 3.20V), 1B (3.20V - 3.50V), and 1C (3.50V - 3.80V). This helps in matching LEDs for series connections to ensure uniform current distribution.

5.3 Color Binning (Phosphor Converted Amber)

The color coordinates are tightly controlled within specified bins on the CIE chromaticity diagram. Two primary bins are defined: YA and YB, each with a specific quadrilateral area on the x,y coordinate plot. The target coordinates for bin YA are CIE x: 0.5680, y: 0.4315, and for bin YB are x: 0.5763, y: 0.4054. The measurement tolerance for color coordinates is \u00b10.005. This binning aligns with ECE (Economic Commission for Europe) specifications for automotive signaling colors.

6. Mechanical and Package Information

The device uses an SMD ceramic package. The mechanical dimensions, including length, width, height, and pad locations, are provided in the datasheet's mechanical drawing section. This information is critical for PCB footprint design. The recommended soldering pad layout is also specified to ensure reliable solder joints and optimal thermal transfer from the device's thermal pad to the PCB.

7. Soldering and Assembly Guidelines

7.1 Reflow Soldering Profile

A recommended reflow soldering profile is provided to guide the assembly process. This profile defines the temperature ramp-up rate, preheat soak time and temperature, time above liquidus (TAL), peak temperature, and cooling rate. Adhering to this profile, with a peak temperature not exceeding 260\u00b0C, is essential to prevent thermal damage to the LED package and ensure solder joint integrity.

7.2 Precautions for Use

General precautions include handling the device with care to avoid mechanical stress, using appropriate ESD protection during handling and assembly, and ensuring the driving circuit is designed to operate within the absolute maximum ratings. Proper thermal management on the PCB, using adequate copper area or heatsinking, is mandatory to maintain performance and reliability, as indicated by the derating curve.

8. Packaging and Ordering Information

Packaging information details how the components are supplied, typically in tape and reel format for automated assembly. The part number ALFS1G-PA10001H-AM follows a specific structure that encodes information about the series, package type, flux/color bin, voltage bin, and other attributes. Ordering information would specify the exact bin combinations available for purchase.

9. Application Suggestions

9.1 Typical Application Scenarios

The primary application is Automotive Exterior Lighting, specifically Signaling. This includes turn signals, daytime running lights (DRLs), position lights, and stop lights. The amber color, wide viewing angle, and high brightness make it suitable for these functions where visibility and compliance with automotive color regulations are paramount.

9.2 Design Considerations

Designers must consider several factors: Thermal Management: The derating curve and thermal resistance values necessitate an effective PCB thermal design. Drive Current: The circuit must provide stable current within the specified range, considering the forward voltage binning. Optical Design: Lenses or reflectors may be needed to shape the 120\u00b0 beam for specific signaling patterns. Environmental Robustness: The design should leverage the device's AEC-Q102 and sulfur robustness qualifications for reliable operation in harsh automotive environments.

10. Technical Comparison and Differentiation

Compared to standard plastic SMD LEDs, the ceramic package of the ALFS1G-PA10001H-AM offers significantly better thermal conductivity. This allows it to be driven at higher currents (up to 1500mA) while maintaining lower junction temperatures, leading to higher light output and longer lifetime. The AEC-Q102 qualification and explicit sulfur robustness (Class A1) are key differentiators for automotive applications, where many industrial-grade LEDs would not be suitable. The precise color binning to ECE standards is another critical advantage for automotive signaling, ensuring legal compliance and color consistency across multiple lamps on a vehicle.

11. Frequently Asked Questions (Based on Technical Parameters)

Q: What is the minimum drive current for this LED?

A: The device should not be operated below 50mA, as indicated on the derating curve.

Q: How does temperature affect the light output?

A: As shown in the performance graphs, relative luminous flux decreases as junction temperature increases. Proper heatsinking is vital to maintain brightness.

Q: What does "Sulfur Robustness Class A1" mean?

A: It indicates the LED's resistance to sulfur-induced corrosion. Class A1 is a specific performance level in standardized tests, ensuring reliability in atmospheres containing sulfur compounds.

Q: Can multiple LEDs be connected in series?

A: Yes, but it is advisable to use LEDs from the same forward voltage bin (1A, 1B, or 1C) to ensure even current distribution across the string.

Q: Is a constant current or constant voltage driver recommended?

A> LEDs are current-driven devices. A constant current driver is strongly recommended to ensure stable light output and protect the LED from thermal runaway, as the forward voltage has a negative temperature coefficient.

12. Design and Usage Case Study

Consider designing a new automotive rear turn signal lamp. The design requirements include an amber color compliant with ECE regulations, high brightness for daytime visibility, a wide viewing angle for side visibility, and high reliability over a vehicle's lifetime in various climates. The ALFS1G-PA10001H-AM is selected. The design process involves: 1) Determining the number of LEDs needed to meet the photometric requirements, using the typical 250 lm flux and derating for expected operating temperature. 2) Designing a metal-core PCB (MCPCB) with sufficient thermal vias and copper area to keep the solder pad temperature below 110\u00b0C to allow full 1500mA operation, based on the derating curve. 3) Implementing a constant current LED driver circuit rated for the total forward voltage of the LED string (based on the V_F bin selected). 4) Incorporating an optical element (lens) to further distribute the 120\u00b0 beam into the required regulatory pattern for turn signals. This approach leverages the LED's high flux, wide angle, color consistency, and robustness to create a reliable, high-performance automotive lamp.

13. Operating Principle Introduction

Light Emitting Diodes (LEDs) are semiconductor devices that emit light when an electric current passes through them. This phenomenon is called electroluminescence. When a forward voltage is applied across the p-n junction of the semiconductor material, electrons recombine with electron holes, releasing energy in the form of photons. The color of the light is determined by the energy band gap of the semiconductor material. The ALFS1G-PA10001H-AM likely uses a phosphor-converted method to achieve its amber color: a blue or near-UV LED chip is coated with a phosphor material that absorbs some of the chip's light and re-emits it at longer wavelengths (yellow/red), mixing with the remaining blue light to produce amber.

14. Technology Trends

The trend in automotive lighting LEDs is towards higher efficiency (more lumens per watt), higher power density, and greater integration. This allows for smaller, more stylized lamp designs while meeting or exceeding regulatory brightness requirements. There is also a strong focus on improved reliability and qualification for increasingly harsh automotive environments, including higher temperature under-hood applications and resistance to various chemical exposures. The move towards adaptive driving beams (ADB) and pixelated headlights is driving the development of LEDs with faster switching capabilities and tighter optical control. Furthermore, the industry continues to push for wider color gamuts and stability for both signaling and interior ambient lighting applications.