LED Lamp Array A203B/SYG/S530-E2 Datasheet - Brilliant Yellow Green - 20mA - 2.0V - English Technical Document

1. Product Overview

The A203B/SYG/S530-E2 is a low-power, high-efficiency LED lamp array designed for use as a visual indicator in various electronic instruments and equipment. It consists of a plastic holder that allows for the combination of multiple LED lamps, providing flexibility in design and application. The product is characterized by its ease of assembly, stackable design (both vertically and horizontally), and versatile mounting options on printed circuit boards or panels.

1.1 Core Advantages and Target Market

The primary advantages of this LED array include its low power consumption, which contributes to energy efficiency in end applications, and its high luminous intensity for clear visual indication. The design facilitates good control over color combinations and offers a secure locking mechanism for reliable assembly. It is particularly suited for applications requiring status indication, such as showing operational modes, degrees, functions, or positions within electronic devices. The product complies with environmental standards including RoHS, REACH, and Halogen-Free requirements, making it suitable for markets with strict regulatory compliance needs.

2. Technical Parameter Deep Dive

This section provides a detailed, objective interpretation of the key technical parameters specified in the datasheet.

2.1 Absolute Maximum Ratings

The device is rated for a continuous forward current (I_F) of 25 mA. Exceeding this value can lead to permanent damage. A peak forward current (I_FP) of 60 mA is allowed under pulsed conditions (duty cycle 1/10 at 1 kHz). The maximum reverse voltage (V_R) is 5 V; applying a higher reverse voltage can cause junction breakdown. The power dissipation (P_d) limit is 60 mW, which is crucial for thermal management. The operating temperature range is from -40°C to +85°C, and storage can be from -40°C to +100°C. The soldering temperature is specified as 260°C for a maximum of 5 seconds, which is a standard lead-free soldering profile.

2.2 Electro-Optical Characteristics

Measured at a standard test condition of 25°C and a forward current of 20 mA, the key characteristics are:

• Forward Voltage (V_F): Typically 2.0V, with a range from 1.7V (Min) to 2.4V (Max). This parameter is essential for designing the driving circuitry and ensuring proper voltage supply.
• Luminous Intensity (I_V): The typical value is 80 mcd, with a minimum of 40 mcd. This defines the brightness of the LED under standard conditions.
• Viewing Angle (2θ_1/2): The typical full viewing angle is 45 degrees. This indicates the angular spread over which the luminous intensity is at least half of its peak value, defining the beam pattern.
• Wavelength: The peak wavelength (λ_p) is typically 575 nm, and the dominant wavelength (λ_d) is typically 573 nm, placing the emitted color in the brilliant yellow-green region of the spectrum. The spectral bandwidth (Δλ) is typically 20 nm.
• Reverse Current (I_R): Maximum 10 μA at a reverse voltage of 5V, indicating good junction quality.

3. Performance Curve Analysis

The datasheet includes several characteristic curves that provide deeper insight into the device's behavior under varying conditions.

3.1 Relative Intensity vs. Wavelength

This curve shows the spectral power distribution of the emitted light. For the A203B/SYG/S530-E2, the curve would be centered around 573-575 nm (yellow-green) with a typical full width at half maximum (FWHM) of 20 nm. This narrow bandwidth is characteristic of AlGaInP-based LEDs and results in a saturated, pure color.

3.2 Directivity Pattern

The directivity curve (radiation pattern) illustrates how light intensity varies with the viewing angle. A typical 45-degree viewing angle suggests a Lambertian or near-Lambertian distribution, where intensity is highest at 0 degrees (perpendicular to the emitting surface) and decreases gradually towards the edges.

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

This fundamental curve shows the exponential relationship between current and voltage for a semiconductor diode. For this LED, at the typical operating point of 20 mA, the forward voltage is approximately 2.0V. The curve is essential for selecting current-limiting resistors or designing constant-current drivers.

3.4 Relative Intensity vs. Forward Current

This curve demonstrates that luminous intensity is generally proportional to forward current within the recommended operating range. However, efficiency may drop at very high currents due to increased heat generation. Operating at the recommended 20mA ensures optimal performance and longevity.

3.5 Temperature Dependence Curves

Relative Intensity vs. Ambient Temperature: LED light output typically decreases as ambient temperature increases. This curve is critical for applications operating in high-temperature environments, as it may necessitate optical or electrical compensation to maintain consistent brightness.
Forward Current vs. Ambient Temperature: This curve might show the relationship between the diode's forward voltage drop and temperature, which is a key parameter for temperature sensing applications, though not explicitly detailed here.

4. Mechanical and Package Information

4.1 Package Dimensions

The datasheet includes a detailed dimensional drawing of the LED lamp array. Key dimensions include the overall length, width, and height of the plastic holder, the spacing between individual LED positions (if applicable), and the lead (pin) dimensions and spacing. The note specifies that all dimensions are in millimeters with a general tolerance of ±0.25 mm unless otherwise stated. Lead spacing is measured at the point where the leads emerge from the package body, which is critical for PCB layout design.

4.2 Polarity Identification

While not explicitly shown in the provided text, typical LED arrays have markings to indicate polarity, such as a longer anode lead, a flat edge on the package, or a dot near the cathode. Correct polarity connection is mandatory for operation.

5. Soldering and Assembly Guidelines

Proper handling is crucial for reliability. The guidelines are extensive:

5.1 Lead Forming

• Bending must occur at least 3 mm from the base of the epoxy bulb to avoid stress on the internal die and wire bonds.
• Forming must be done before soldering.
• Excessive stress during forming can crack the epoxy or damage the semiconductor, degrading performance or causing failure.
• Cutting leads should be done at room temperature.
• PCB holes must align perfectly with LED leads to avoid mounting stress.

5.2 Storage

• Recommended storage: ≤30°C and ≤70% Relative Humidity for up to 3 months from shipment.
• For longer storage (up to 1 year), use a sealed container with a nitrogen atmosphere and desiccant.
• Avoid rapid temperature changes in humid environments to prevent condensation.

5.3 Soldering Process

General Rule: Maintain a minimum distance of 3 mm from the solder joint to the epoxy bulb.
Hand Soldering: Iron tip temperature ≤300°C (for a max. 30W iron), soldering time ≤3 seconds per joint.
Wave/DIP Soldering: Preheat ≤100°C for ≤60 seconds. Solder bath temperature ≤260°C for ≤5 seconds.
Critical Notes:
1. Avoid mechanical stress on leads while the LED is hot from soldering.
2. Do not solder (dip or hand) the same joint more than once.
3. Protect the LED from shock/vibration until it cools to room temperature.
4. Avoid rapid cooling from peak soldering temperature.
5. Always use the lowest effective soldering temperature.
6. A recommended soldering temperature profile graph is provided, which typically shows a ramp-up, preheat, rapid rise to peak temperature, and controlled cool-down phases.

5.4 Cleaning

• If necessary, clean only with isopropyl alcohol at room temperature for ≤1 minute.
• Air dry at room temperature.
• Do not use ultrasonic cleaning unless absolutely necessary and only after thorough pre-qualification testing, as ultrasonic energy can damage the internal structure.

5.5 Heat Management

The datasheet emphasizes that thermal management must be considered during the application design phase. Excessive junction temperature reduces light output (lumen depreciation) and shortens lifespan. The current should be de-rated appropriately based on the operating ambient temperature, referring to any provided de-rating curves. Ensuring adequate heat sinking or airflow is essential for high-reliability applications.

6. Packaging and Ordering Information

6.1 Packing Specification

The product is packaged to prevent electrostatic discharge (ESD) and moisture ingress:
1. Primary Pack: 200 pieces per anti-static bag.
2. Secondary Pack: 4 bags (800 pieces) per inner carton.
3. Tertiary Pack: 10 inner cartons (8,000 pieces) per master outside carton.

6.2 Label Explanation

Labels on the packaging contain several codes:
• CPN: Customer's Part Number.
• P/N: Manufacturer's Part Number (e.g., A203B/SYG/S530-E2).
• QTY: Quantity contained.
• CAT: Ranks or binning codes (e.g., for luminous intensity or wavelength).
• HUE: Dominant Wavelength.
• REF: Reference code.
• LOT No: Traceable manufacturing lot number.

6.3 Device Selection Guide & Model Number

The specific part number listed is 333-2SYGD/S530-E2-L. The breakdown is:
• Chip Material: AlGaInP (Aluminum Gallium Indium Phosphide), a semiconductor material efficient for producing yellow, orange, red, and green light.
• Emitted Color: Brilliant Yellow Green.
• Resin Color: Green Diffused. The diffused resin helps widen the viewing angle and soften the appearance of the LED point source.

7. Application Suggestions

7.1 Typical Application Scenarios

As stated, the primary application is as an indicator in electronic instruments. This includes:
• Status indicators on control panels (power on/off, standby, fault).
• Level or degree indicators (e.g., signal strength, battery charge level).
• Function mode selectors.
• Position indicators on machinery or equipment.
The stackable and combinable nature of the array allows for creating custom bar graphs, multi-status displays, or clustered indicator panels.

7.2 Design Considerations

• Current Limiting: Always use a series resistor or constant-current driver to limit the forward current to 20mA (or less for de-rating). Calculate the resistor value using R = (V_supply - V_F) / I_F.
• PCB Layout: Ensure hole sizes and positions match the package drawing. Provide adequate clearance around the epoxy bulb.
• Thermal Design: For arrays or high-duty-cycle operation, consider the collective heat generation. Ensure the PCB or panel can dissipate heat effectively.
• ESD Protection: Although not specified as highly sensitive, follow good ESD handling practices during assembly.

8. Technical Comparison and Differentiation

While a direct comparison with other products is not provided in the datasheet, key differentiating features of this LED array can be inferred:
1. Array Format: The integrated plastic holder for multiple LEDs simplifies assembly compared to mounting discrete LEDs individually, improving consistency and speed.
2. Stackability: The ability to stack units vertically and horizontally is a unique mechanical feature for building compact, multi-level indicator assemblies.
3. Comprehensive Compliance: Meeting RoHS, REACH, and Halogen-Free standards simultaneously is a significant advantage for products targeting global markets, especially Europe.
4. Detailed Process Guidance: The extensive notes on soldering, storage, and handling indicate a focus on manufacturability and end-user reliability.

9. Frequently Asked Questions (Based on Technical Parameters)

Q1: Can I drive this LED with a 5V supply directly?
A: No. The typical forward voltage is 2.0V. Connecting it directly to 5V would cause excessive current, potentially destroying the LED. You must use a current-limiting resistor. For example, with a 5V supply: R = (5V - 2.0V) / 0.020A = 150 Ω.

Q2: What is the difference between peak wavelength (575 nm) and dominant wavelength (573 nm)?
A: Peak wavelength is the wavelength at which the emitted optical power is maximum. Dominant wavelength is the single wavelength of monochromatic light that matches the perceived color of the LED. They are often close but not identical, especially for LEDs with asymmetric spectra.

Q3: The luminous intensity is only 80 mcd typical. Is this bright enough?
A: Brightness is application-dependent. 80 mcd is sufficient for many indoor indicator applications viewed at close range. For long-distance viewing or in brightly lit environments, a higher-intensity LED might be required.

Q4: Why is the storage humidity limited to 70% RH?
A: High humidity can lead to moisture absorption by the epoxy package. During subsequent high-temperature processes like soldering, this trapped moisture can rapidly expand, causing internal cracks or delamination (\"popcorning\"), which damages the LED.

10. Practical Use Case

Scenario: Designing a Multi-Function Test Equipment Panel
An engineer is designing the front panel for a multi-channel signal analyzer. Each channel needs to indicate several states: Power (Green), Active Measurement (Yellow Green), Error (Red), and Data Ready (Blue).
Implementation with A203B Array:
1. The engineer uses the A203B holder as a base.
2. They populate it with four different LED chips (or uses multiple holders, each with a single color).
3. The stackable feature allows them to align four holders (one for each channel) vertically next to each input port, creating a compact, organized status column for each channel.
4. The LEDs are driven by the equipment's microcontroller via current-limiting resistors. The 20mA drive current ensures consistent brightness.
5. The green diffused resin of the yellow-green LED provides a clear, wide-angle view of the \"Active\" status. The detailed soldering instructions ensure reliable assembly during PCB population.

11. Technology Introduction

The LED is based on an AlGaInP (Aluminum Gallium Indium Phosphide) semiconductor chip. This material system is grown on a substrate (often GaAs) and is particularly efficient at converting electrical energy into light in the red, orange, yellow, and yellow-green regions of the visible spectrum. The specific composition of the Al, Ga, In, and P atoms determines the bandgap energy and thus the wavelength of the emitted light. A wavelength of ~573-575 nm corresponds to a yellow-green hue. The chip is encapsulated in an epoxy resin. The \"Green Diffused\" resin contains scattering particles that help distribute the light more evenly, broadening the viewing angle and reducing glare compared to a clear resin.

12. Development Trends

Trends in indicator LED technology, as reflected in this datasheet and general industry movement, include:
1. Increased Efficiency: Ongoing development aims to produce higher luminous intensity (mcd) for the same or lower drive current, reducing power consumption further.
2. Miniaturization: While this is a through-hole array, there is a broad trend towards surface-mount device (SMD) packages for even smaller footprints and automated assembly.
3. Enhanced Reliability and Robustness: Improvements in epoxy materials, die attach techniques, and wire bonding continue to extend operational lifetime and tolerance to harsh environments.
4. Stricter Environmental Compliance: The explicit mention of RoHS, REACH, and Halogen-Free compliance is now standard and will continue to be a baseline requirement, with potential expansion to other substance restrictions.
5. Smart Integration: While not seen here, a future trend could involve integrating simple control logic or drivers within the LED package or array holder for easier system design.