Oval LED Lamp Bead 3474DKGR/MS Datasheet - Oval - 2.4-3.4V - 30mA - Bright Green - Technical Documentation

1. Product Overview

This document details the technical specifications of the precision elliptical LED lamp bead model 3474DKGR/MS. This component is specifically designed for applications within signage systems that require clear, high-visibility illumination. Its primary design objective is to deliver reliable performance in passenger information displays, variable message signs, and commercial outdoor advertising.

1.1 Core Advantages and Target Market

The distinctive feature of this LED is its elliptical structure, which produces a clear spatial radiation pattern. This optical design is particularly suitable for applications involving color mixing, such as when used with yellow, blue, or red filters, making it an ideal choice for multi-color graphic signs. The primary target markets are transportation infrastructure (e.g., variable message signs at airports, train stations, and highways) and commercial advertising, where long-term reliability and consistent color output are crucial.

1.2 Main Features

• High Luminous Intensity Output:Provides bright, visible light suitable for daytime viewing.
• Elliptical and Directional Radiation:Produz padrões de feixe específicos otimizados para iluminação de sinalização.
• Ângulo de Visão Ampla:A visão assimétrica de 90° (eixo X) / 45° (eixo Y) garante clara visibilidade de diferentes posições.
• Sturdy Material:Manufactured using UV-resistant epoxy resin, enhancing durability in outdoor environments.
• Environmental Compliance:产品符合RoHS、欧盟REACH及无卤标准（Br <900ppm, Cl <900ppm, Br+Cl <1500ppm）。

2. Detailed Technical Parameters

2.1 Device Selection and Absolute Maximum Ratings

LED hii inatumia chip ya InGaN (Indium Gallium Nitride) kupitia lenzi ya kijani iliyotawanyika kutoa mwanga mkali wa kijani. Kufanya kazi zaidi ya viwango vya juu kabisa vya kiwango cha juu kunaweza kusababisha uharibifu wa kudumu.

2.2 Photoelectric Characteristics (Ta=25°C)

These parameters define the optical output and electrical behavior under standard test conditions (forward current I_F =20mA)._FVigezo

I_F =20mA

Reverse current

I_R

μA

3.1 Luminous Intensity Binning

LEDs are categorized into five bins (GA through GE) based on their luminous intensity measured at 20mA. The tolerance is ±10%.

G1

G2

G3

G4G54. Performance Curve AnalysisThe following typical curves illustrate the behavior of the device under various conditions. This is crucial for robust system design.4.1 Spectral Distribution and Directivity

The "Relative Intensity vs. Wavelength" curve shows a peak at approximately 522nm, confirming bright green luminescence, with a typical spectral bandwidth of 20nm. The "Directivity" diagram visually demonstrates an asymmetric 90°x45° viewing angle, illustrating the spatial distribution of light intensity.

4.2 Electrical and Thermal Characteristics"Forward Current vs. Forward Voltage (I-V Curve)" yana nuna halayen diode na ma'auni. A cikin yanayin aiki na yau da kullun na 20mA, ƙarfin lantarki na gaba yana faɗowa cikin kewayon 2.4V zuwa 3.4V. "Ƙarfin Dangi vs. Ƙarfin Gaba" lanƙwasa yana nuna fitowar haske yana ƙaruwa tare da ƙaruwar ƙarfin lantarki, amma masu ƙira ba za su wuce iyakar iyakar ba.4.3 Dogaro da Zazzabi"Ƙarfin Dangi vs. Yanayin Muhalli" lanƙwasa yana nuna cewa, yayin da zafin jiki ya tashi, fitowar haske zai ragu, wannan shine siffar gama gari na LED. "Ƙarfin Gaba vs. Yanayin Muhalli" lanƙwasa (watakila a cikin ƙarfin lantarki mai tsayi) na iya nuna canjin amfani da ƙarfin lantarki tare da zazzabi. Waɗannan jadawali suna da mahimmanci don ƙira sarrafa zafi da kewayon tuƙi, don tabbatar da aikin kwanciyar hankali a cikin ƙayyadaddun kewayon -40°C zuwa +85°C.5. Mechanical and Packaging Information

5.1 Package Dimensions

The elliptical lamp bead has specific package dimensions and outline. Key dimension notes include: Unless otherwise specified, all dimensions are in millimeters, with a standard tolerance of ±0.25mm. The maximum resin protrusion under the flange is 1.5mm. Detailed package drawings provide precise dimensions for PCB layout and mechanical assembly.5.2 Polarity Identification and MountingThis component has two pins. Correct polarity must be observed during installation to ensure proper operation and prevent damage from reverse bias. The PCB holes must be precisely aligned with the pin positions to avoid applying mechanical stress to the epoxy body during the soldering process.6. Soldering and Assembly Guide6.1 Pin Forming and Handling

The bend point must be at least 3mm from the bottom of the epoxy LED.

6.2 Soldering Process

The maximum soldering temperature is 260°C for 5 seconds. The solder joint must be more than 3mm away from the epoxy LED to prevent heat damage to the resin and semiconductor chip.

6.3 Storage Conditions

After shipment, store at ≤30°C and ≤70% relative humidity (RH). The shelf life under these conditions is 3 months. For storage exceeding 3 months up to one year, place the LEDs in a sealed container filled with nitrogen and containing a moisture-absorbing desiccant. Avoid sudden temperature changes in humid environments to prevent condensation on the component surface.

7. Packaging and Ordering Information

7.1 Moisture-Proof Packaging

• LEDs are supplied in moisture-proof packaging. They are typically loaded in carrier tapes, then placed into inner boxes, and finally packed into outer shipping cartons.
• 7.2 Adadin marufi da ƙayyadaddun tef ɗin ɗaukar kaya
• Daidaitaccen marufi: Kowane akwatin ciki yana ɗauke da 2,500. Kowane babban (waje) akwati yana ɗauke da akwatuna ciki 10 (Jimlar 25,000). An bayar da cikakkun bayanai game da girman tef ɗin ɗaukar kaya, gami da tazarar ramin ciyarwa (P=12.70mm), tazarar aljihun kayan aiki (F=2.54mm), da faɗin tef ɗin gabaɗaya (W3=18.00mm).
• 7.3 Label Description and Model Naming
• The packaging label includes fields for Customer Part Number (CPN), Part Number (P/N), Quantity (QTY), and specific binning codes for Luminous Intensity (CAT), Dominant Wavelength (HUE), and Forward Voltage (REF). The complete product naming follows a structured format:

8. Application Recommendations

8.1 Typical Application Scenarios

Passenger Information Displays:

• 8.2 Design Considerations
• Driving Circuit:
• 9. Technical Comparison and Differentiation

Compared to standard round LED lamps, this oval lamp offers a key advantage: its asymmetric radiation pattern (90°x45°) is inherently better suited for illuminating the rectangular pixels commonly found in character-type signs and information boards, potentially reducing light waste and improving efficiency. Designed specifically for color-mixing applications also distinguishes it from general-purpose indicator LEDs. Its compliance with the latest environmental standards (halogen-free, REACH) makes it suitable for modern, eco-conscious designs, whereas older component formulations may be restricted.

10. Frequently Asked Questions (Based on Technical Specifications)

Q: What is the difference between Peak Wavelength (typical 522nm) and Dominant Wavelength (typical 528nm)? A: Peak Wavelength is the point of highest intensity in the spectrum. Dominant Wavelength is the wavelength of monochromatic light that produces the same perceived color. Designers concerned with color appearance should focus on Dominant Wavelength and its binning.

Q: Can I drive this LED continuously at 30mA? A: Yes, 30mA is the absolute maximum continuous forward current. However, operating at the maximum rating may reduce long-term reliability and increase junction temperature. Typical photometric data is given at 20mA, which is the recommended operating point for optimal performance and lifetime.

• Q: How critical is the 3mm distance for lead bending and soldering? A: Extremely critical. Bending or applying heat within 3mm of the epoxy body transmits mechanical or thermal stress directly to the internal bond wires and the die itself, significantly increasing the risk of immediate failure or latent reliability issues.
• Q: Why are the storage conditions so specific (3 months at 30°C/70%RH)? A: LED packages absorb moisture from the atmosphere. If subjected to high-temperature soldering (reflow) after moisture absorption, the rapid vaporization of the moisture can cause internal delamination or cracking ("popcorn" effect). The specified storage limits and the requirement for dry baking or nitrogen storage after 3 months are standard industry practices (based on MSL - Moisture Sensitivity Level) to prevent this failure mode.
• 11. Practical Use Case Example

Scenario: Designing pixels for highway Variable Message Signs (VMS). A single pixel on a monochrome (green) VMS may use one or several such oval LEDs. The designer will: 1. Select the luminous intensity grade (e.g., GC or GD) to ensure the sign meets minimum visibility standards under bright sunlight. 2. Select the dominant wavelength grade (e.g., G3) to ensure a consistent green color across the entire sign face. 3. Design the PCB layout to match the mechanical drawings of the LEDs and provide sufficient copper foil area for heat dissipation. 4. Implement a constant current drive circuit for each pixel or each row/column, set to provide a current of 20mA ±5%. 5. Precisely follow assembly guidelines, using automated equipment for pin insertion and soldering to maintain a 3mm gap. 6. Test within the operating temperature range (-40°C to +85°C) to verify that the light output remains within an acceptable range.

12. Brief Introduction to Working PrincipleThis LED operates based on the principle of electroluminescence in semiconductors. The core is a chip made of InGaN (Indium Gallium Nitride) material. When a forward voltage (exceeding a threshold of approximately 2.4V) is applied, electrons and holes are injected into the active region of the semiconductor, where they recombine. This recombination process releases energy in the form of photons (light). The specific composition of the InGaN alloy determines the bandgap energy, which in turn defines the wavelength (color) of the emitted light—green in this case. An oval epoxy resin lens then encapsulates the chip, protecting it from environmental influences and shaping the emitted light into the desired radiation pattern.13. Fasahar Trend da Background

LEDs for signage have evolved from simple indicator lights into high-performance optical components. The trends are toward higher efficiency (more lumens per watt), improved color consistency through tighter binning, and enhanced reliability for 24/7 outdoor operation. This oval LED represents a specialized solution within this trend, optimizing the form factor and beam pattern for specific application areas. Future developments may include integrated driver electronics, higher temperature tolerance, and narrower wavelength distributions for purer colors in full-color RGB displays. The emphasis on halogen-free and environmentally compliant materials reflects the broader industry shift toward sustainable electronics manufacturing.

.1 Typical Application Scenarios

• Passenger Information Signs:In airports, train, and bus stations.
• Variable Message Signs (VMS):On highways for traffic alerts and guidance.
• Message Boards & Commercial Advertising:For indoor and outdoor digital displays.
• Color Graphic Signs:Where colored filters are used over a white or green light source to create multiple colors from a single LED type.

.2 Design Considerations

• Drive Circuit:Use a constant current driver set to ≤30mA (typical 20mA) to ensure stable light output and long life. Include protection against voltage transients and reverse connection.
• Thermal Management:Although power dissipation is low (110mW max), ensure adequate PCB copper area or heatsinking if operating at high ambient temperatures or in enclosed spaces to maintain performance and reliability.
• Optical Design:Leverage the oval beam pattern and wide viewing angle. For color mixing applications, ensure the selected wavelength bin provides the desired hue after filtering.
• Binning for Consistency:For large displays, specify tight bins (CAT and HUE) to minimize visible differences in brightness and color between adjacent LEDs.

. Technical Comparison and Differentiation

Compared to standard round LED lamps, this oval lamp offers a key advantage: its asymmetric radiation pattern (90°x45°) is inherently better suited for illuminating the rectangular pixels commonly found in character-based signs and message boards, potentially reducing optical waste and improving efficiency. The dedicated design for color-mixing applications also sets it apart from general-purpose indicator LEDs. Its compliance with the latest environmental standards (Halogen-Free, REACH) makes it suitable for modern, eco-conscious designs where older component formulations may be restricted.

. Frequently Asked Questions (Based on Technical Parameters)

Q: Menene bambancin tsakanin Peak Wavelength (522nm Typ.) da Dominant Wavelength (528nm Typ.)?
A: Peak Wavelength shine mafi girman ƙarfi a cikin bakan. Dominant Wavelength shine kawai tsayin haske na monochromatic wanda zai samar da launi ɗaya da ake gani. Masu zanen da ke damuwa da bayyanar launi yakamata su mai da hankali kan Dominant Wavelength da rarrabuwarsa.

Q: Inaweza niiendeshe LED hii kwa 30mA kila wakati?
A: Ndiyo, 30mA ndiyo Upeo Kabisa wa Mwendelezo wa Sasa wa Mbele. Hata hivyo, kufanya kazi kwa kiwango cha juu kabisa kunaweza kupunguza uaminifu wa muda mrefu na kuongeza joto la makutano. Data ya kawaida ya umeme-na-mwanga inatolewa kwa 20mA, ambayo ndiyo hatua inayopendekezwa ya uendeshaji kwa utendakazi bora na maisha marefu.

Q: Ni muhimu kiasi gani umbali wa 3mm kwa kupinda na kuuza waya?
A> It is very important. Bending or applying heat closer than 3mm to the epoxy body transfers mechanical or thermal stress directly to the internal wire bonds and the chip itself, significantly increasing the risk of immediate failure or latent reliability issues.

Q: Kí ni idi ti ipo ipamọ jẹ pataki bẹ (osu 3 ni 30°C/70%RH)?
A> LED packages can absorb moisture from the atmosphere. If subjected to high-temperature soldering (reflow) after absorption, the rapid vaporization of this moisture can cause internal delamination or cracking (\"popcorning\"). The specified storage limits and the requirement for dry-baking or nitrogen storage after 3 months are standard industry practices (based on MSL - Moisture Sensitivity Level ratings) to prevent this failure mode.

. Practical Use Case Example

Scenario: Designing a Highway Variable Message Sign (VMS) Pixel.
A single pixel on a monochrome (green) VMS might use one or several of these oval LEDs. The designer would:
. Select a luminous intensity bin (e.g., GC or GD) to ensure the sign meets minimum visibility standards in bright sunlight.
. Select a dominant wavelength bin (e.g., G3) to guarantee a consistent green color across the entire sign face.
. Design a PCB with a layout that matches the LED's mechanical drawing, providing sufficient copper area for heat dissipation.
. Implement a constant-current driver circuit per pixel or per row/column, set to deliver 20mA ±5%.
. Follow the assembly guidelines precisely, using automated equipment for lead insertion and soldering to maintain the 3mm clearance.
. Conduct testing over the operational temperature range (-40°C to +85°C) to verify light output remains within acceptable limits.

. Operational Principle Introduction

Wannan LED yana aiki bisa ka'idar electroluminescence a cikin semiconductor. Tsarin sa shine guntu da aka yi da kayan InGaN (Indium Gallium Nitride). Lokacin da aka yi amfani da ƙarfin lantarki na gaba (wanda ya wuce kusan 2.4V na bakin kofa), ana shigar da electrons da ramuka cikin yankin aiki na semiconductor inda suke sake haɗuwa. Wannan tsarin sake haɗuwa yana sakin makamashi a cikin nau'in photons (haske). Takamaiman abun da ke cikin gawa na InGaN yana ƙayyade makamashin bandgap, wanda kuma ke ayyana tsayin raƙuman ruwa (launi) na hasken da aka fitar—a wannan yanayin, kore. Sa'an nan kuma ruwan tabarau na epoxy mai siffar kwai yana rufe guntun, yana kare shi daga muhalli, kuma yana siffanta hasken da aka fitar zuwa tsarin radiyon da ake so.

. Technology Trends and Context

LEDs for signage have evolved from simple indicators to high-performance optical components. The trend is toward higher efficiency (more lumens per watt), improved color consistency through tighter binning, and enhanced reliability for 24/7 outdoor operation. This oval lamp represents a specialized solution within that trend, optimizing form factor and beam pattern for a specific application niche. Future developments may include integrated driver electronics, higher temperature tolerance, and even narrower wavelength distributions for purer colors in full-color RGB displays. The emphasis on halogen-free and environmentally compliant materials reflects the broader industry shift toward sustainable electronics manufacturing.