LED Lamp 1259-7UYSYGW/S530-A3 Datasheet - 5.0mm Round - Voltage 2.0V - Brilliant Yellow/Yellow-Green - English Technical Document

1. Product Overview

The 1259-7 series is a compact LED lamp designed for indicator and backlighting applications. It integrates two matched AlGaInP semiconductor chips within a single package, enabling uniform light output and a wide 40-degree viewing angle. The product is available in two primary configurations: bicolor types and bipolar types. Bicolor lamps typically combine two different colors (e.g., Brilliant Yellow and Brilliant Yellow Green) in a diffused package, while bipolar lamps feature a single color (White Clear or Color Clear) in a clear package. This design offers solid-state reliability, long operational life, and low power consumption, making it suitable for integration into modern electronic devices.

1.1 Core Advantages and Target Market

The key advantages of this LED lamp include its dual-chip architecture for consistent brightness, compatibility with low-voltage integrated circuits, and compliance with major environmental regulations such as RoHS, EU REACH, and halogen-free standards (Br <900 ppm, Cl <900 ppm, Br+Cl < 1500 ppm). Its primary target markets are consumer electronics and computer peripherals, where reliable, compact indicators are essential.

2. Technical Parameter Deep-Dive

This section provides a detailed, objective analysis of the LED's key specifications as defined in the datasheet.

2.1 Absolute Maximum Ratings

The device must not be operated beyond these limits to prevent permanent damage. For both the UY (Brilliant Yellow) and SYG (Brilliant Yellow Green) chips, the maximum continuous forward current (IF) is 25 mA. The maximum reverse voltage (VR) is 5 V. The power dissipation (Pd) for each chip is limited to 60 mW. The operating temperature range (Topr) is from -40°C to +85°C, and storage temperature (Tstg) extends from -40°C to +100°C. The soldering temperature (Tsol) is specified for reflow processes at 260°C for a maximum of 5 seconds.

2.2 Electro-Optical Characteristics (Ta=25°C)

These parameters define the LED's performance under typical conditions. The forward voltage (VF) for both chips is typically 2.0V, with a range from 1.7V to 2.4V at a test current of 20mA. The maximum reverse current (IR) is 10 µA at 5V. Luminous intensity (IV) is a key metric: the UY chip has a typical value of 125 mcd (min. 63 mcd), while the SYG chip has a typical value of 80 mcd (min. 40 mcd). The viewing angle (2θ1/2) is typically 40 degrees for both. The UY chip's dominant wavelength (λd) is typically 589 nm (peak λp at 591 nm), and the SYG chip's is typically 573 nm (peak λp at 575 nm). The spectral bandwidth (Δλ) is 15 nm for UY and 20 nm for SYG. Measurement uncertainties are noted for forward voltage (±0.1V), luminous intensity (±10%), and dominant wavelength (±1.0nm).

3. Binning System Explanation

The datasheet references a binning system for key parameters, indicated by labels such as CAT (Luminous Intensity rank), HUE (Dominant Wavelength rank), and REF (Forward Voltage rank). This system ensures color and brightness consistency within a production batch. Designers must consult the manufacturer's detailed binning charts (not provided in this excerpt) to select the appropriate codes for their application's color and brightness tolerance requirements.

4. Performance Curve Analysis

Graphical data provides deeper insight into the LED's behavior under varying conditions.

4.1 UY (Brilliant Yellow) Chip Curves

The Relative Intensity vs. Wavelength curve shows a narrow emission peak centered around 591 nm. The Directivity pattern confirms the 40-degree viewing angle. The Forward Current vs. Forward Voltage (I-V) curve exhibits the typical exponential relationship of a diode. The Relative Intensity vs. Forward Current curve shows that light output increases linearly with current up to the rated maximum. The Relative Intensity vs. Ambient Temperature curve indicates a decrease in output as temperature rises, a common characteristic of LEDs. The Forward Current vs. Ambient Temperature curve under constant voltage conditions would show current increase with temperature due to the diode's negative temperature coefficient.

4.2 SYG (Brilliant Yellow Green) Chip Curves

Similar curves are provided for the SYG chip, with its emission peak around 575 nm. An additional Chromaticity Coordinate vs. Forward Current curve is included, which is crucial for understanding any potential color shift that may occur when driving the LED at currents different from the test condition (20mA).

5. Mechanical and Package Information

5.1 Package Dimensions

The LED features a standard 5mm round radial leaded package. Key dimensions include a body diameter, lead spacing, and overall height. The flange height is specified to be less than 1.5mm. Standard dimensional tolerances are ±0.25mm unless otherwise stated. A detailed dimensioned drawing is essential for PCB footprint design.

5.2 Polarity Identification

For bipolar LEDs, the longer lead typically denotes the anode (+). For bicolor LEDs, the common cathode configuration is standard, where the middle lead is common cathode and the two outer leads are the anodes for the two different color chips. The datasheet diagram must be consulted to confirm the exact pinout.

6. Soldering and Assembly Guidelines

Proper handling is critical for reliability.

6.1 Lead Forming

Bending must occur at least 3mm from the epoxy bulb base. Forming must be done before soldering and at room temperature to avoid stress-induced damage or cracking. PCB hole alignment must be precise to prevent mounting stress.

6.2 Soldering Parameters

For hand soldering: iron tip temperature ≤300°C (30W max), time ≤3 seconds, with a minimum 3mm distance from the joint to the bulb. For wave/dip soldering: preheat ≤100°C for ≤60 sec, solder bath ≤260°C for ≤5 sec, with the same 3mm distance rule. A single soldering pass is recommended. A soldering profile graph suggests a ramp-up, peak, and cool-down sequence to minimize thermal shock.

6.3 Storage Conditions

LEDs should be stored at ≤30°C and ≤70% RH. The shelf life from shipment is 3 months. 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.

7. Packaging and Ordering Information

7.1 Packing Specification

LEDs are packed in anti-static bags (200-500 pcs/bag). Five bags are placed in an inner carton, and ten inner cartons are packed into an outside master carton. The packaging materials are moisture-resistant.

7.2 Label Explanation

The package label includes: CPN (Customer's Part Number), P/N (Manufacturer's Part Number), QTY (Quantity), CAT (Luminous Intensity bin), HUE (Dominant Wavelength bin), REF (Forward Voltage bin), and LOT No. (Traceability code).

8. Application Suggestions

8.1 Typical Application Scenarios

Primary applications include status indicators for TVs, monitors, telephones, and computers. The bicolor version is suitable for dual-state signaling (e.g., power on/standby), while the high-brightness clear versions are ideal for panel illumination.

8.2 Design Considerations

Always use a current-limiting resistor in series with the LED. Calculate resistor value based on supply voltage, LED forward voltage (use typical or max depending on design margin), and desired forward current (≤20mA for normal operation). Consider the LED's temperature derating when designing for high ambient temperature environments. Ensure the PCB layout provides adequate clearance around the LED bulb as per soldering guidelines.

9. Technical Comparison and Differentiation

The key differentiator of the 1259-7 series is its dual-chip-in-one-package design for bicolor functionality or brightness uniformity in a standard 5mm format. Compared to single-chip 5mm LEDs, it offers design flexibility (two colors) or a more uniform luminous pattern. Its AlGaInP technology provides high efficiency in the yellow/green spectrum compared to older technologies. Compliance with modern environmental regulations (RoHS, REACH, Halogen-Free) is a standard requirement but remains a key selection criterion.

10. Frequently Asked Questions (Based on Technical Parameters)

Q: Can I drive this LED at 25mA continuously?
A: While the Absolute Maximum Rating is 25mA, the Electro-Optical Characteristics are specified at 20mA. For reliable long-term operation and to manage junction temperature, it is recommended to operate at or below 20mA.

Q: What is the difference between dominant wavelength and peak wavelength?
A: Peak wavelength (λp) is the single point of highest spectral power. Dominant wavelength (λd) is the single wavelength of a monochromatic light that matches the perceived color of the LED. λd is more relevant for color specification in applications.

Q: How do I interpret the luminous intensity bin (CAT)?
A: The CAT code corresponds to a specific range of mcd values. You must request the manufacturer's binning document to know the exact min/max values for each CAT code to ensure your brightness requirements are met.

11. Practical Design and Usage Case

Case: Dual-Color Status Indicator for a Network Router. A designer uses the bicolor 1259-7 (UY/SYG) to indicate network activity (flashing green) and error states (steady yellow). They use a microcontroller to switch current between the two anode pins (sharing a common cathode). A 100Ω resistor is used on each anode leg with a 5V supply, resulting in a current of approximately (5V - 2.0V)/100Ω = 30mA. To adhere to the 20mA recommendation, they increase the resistor to 150Ω, resulting in ~20mA. The wide viewing angle ensures visibility from various angles.

12. Operating Principle Introduction

This LED is based on AlGaInP (Aluminum Gallium Indium Phosphide) semiconductor material. When a forward voltage is applied across the p-n junction, electrons and holes recombine, releasing energy in the form of photons. The specific composition of the AlGaInP alloy determines the bandgap energy, which directly corresponds to the wavelength (color) of the emitted light—yellow (~589 nm) or yellow-green (~573 nm). The epoxy lens shapes the light output and provides mechanical and environmental protection.

13. Technology Trends

The trend in indicator LEDs is towards higher efficiency (more lumens per watt), smaller package sizes (e.g., 0402, 0201 SMD), and integrated solutions (e.g., LEDs with built-in ICs for sequencing or control). While radial leaded packages like the 5mm remain popular for certain through-hole applications, surface-mount device (SMD) packages dominate new designs due to their smaller footprint and suitability for automated assembly. Environmental compliance and broadening color gamuts continue to be key development drivers.