334-15/T2C5-1PSB LED Lamp Datasheet - T-1 3/4 Package - 2.8-3.6V - 20mA - White Light - English Technical Document

1. Product Overview

This document details the specifications for a high-luminosity white LED lamp. The device is designed for applications demanding significant light output from a compact, industry-standard package. Its core advantage lies in the combination of a high-performance InGaN semiconductor chip with a phosphor conversion system to produce white light, all housed in a robust and widely adopted form factor.

2. Key Features and Description

2.1 Features

• Industry-standard T-1 3/4 (approximately 5mm) round package.
• High luminous power output.
• Typical chromaticity coordinates: x=0.29, y=0.28 (CIE 1931).
• Available in bulk or taped on reel for automated assembly.
• Electrostatic discharge (ESD) withstand voltage: up to 4KV (Human Body Model).
• Compliant with relevant environmental regulations.

2.2 Description

The LED series is engineered specifically for scenarios requiring high luminous intensity. White light is generated through a phosphor-converted method: the blue light emitted from the indium gallium nitride (InGaN) chip is absorbed by a phosphor material filled in the reflector cup, which then re-emits a broader spectrum of light, resulting in the perception of white light. The water-clear resin lens aids in maximizing light extraction.

3. Absolute Maximum Ratings

The following ratings define the limits beyond which permanent damage to the device may occur. Operation under or at these conditions is not guaranteed.

4. Electro-Optical Characteristics

These parameters are measured at an ambient temperature (T_a) of 25°C and represent typical device performance under specified test conditions.

5. Binning System Explanation

To ensure consistency in applications, LEDs are sorted (binned) based on key performance parameters.

5.1 Luminous Intensity Bins

LEDs are categorized into bins defining a minimum and maximum luminous intensity measured at 20mA. The tolerance is ±10%.

5.2 Forward Voltage Bins

LEDs are also binned according to their forward voltage drop at 20mA, with a measurement uncertainty of ±0.1V.

5.3 Color (Chromaticity) Bins

The white light color is defined within specific regions on the CIE 1931 chromaticity diagram. The provided color ranks (A1, A0, B3, B4, B5, B6, C0) specify the quadrilateral boundaries for the x and y coordinates, ensuring the emitted white light falls within a controlled color space. The measurement uncertainty for coordinates is ±0.01. A group code (e.g., \"1\") may combine several adjacent color bins for broader selection.

6. Performance Curve Analysis

Graphical data provides insight into device behavior under varying conditions.

6.1 Relative Intensity vs. Wavelength

The spectral power distribution curve shows a broad peak characteristic of phosphor-converted white LEDs, typically centered in the blue region (from the chip) with a broader yellow-green emission from the phosphor.

6.2 Directivity Pattern

The radiation pattern illustrates the 50-degree viewing angle (full width at half maximum), showing the angular distribution of light intensity.

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

This curve demonstrates the exponential relationship typical of a diode. The forward voltage increases with current, and designers must ensure the driving circuit provides adequate voltage, especially considering the voltage bin spread.

6.4 Relative Intensity vs. Forward Current

Luminous output increases with forward current but not linearly. Operating above the recommended continuous current (20mA typ.) may yield higher light output but will reduce efficiency and potentially affect long-term reliability due to increased junction temperature.

6.5 Chromaticity Coordinate vs. Forward Current

The color coordinates (x, y) may shift slightly with changes in drive current, which is an important consideration for applications requiring stable color perception across dimming levels.

6.6 Forward Current vs. Ambient Temperature

This derating curve is critical for thermal management. It indicates the maximum allowable forward current as the ambient temperature rises, preventing overheating and ensuring longevity.

7. Mechanical and Package Information

7.1 Package Dimensions

The LED uses a standard T-1 3/4 radial leaded package. Key dimensions include the body diameter (approximately 5mm), lead spacing (measured where leads exit the package), and overall height. A detailed dimensioned drawing is essential for PCB footprint design, ensuring proper fit and alignment. Notes specify a maximum resin protrusion under the flange of 1.5mm and standard dimensional tolerances.

7.2 Polarity Identification

The cathode is typically identified by a flat spot on the rim of the LED lens or by the shorter lead. Correct polarity must be observed during installation.

8. Soldering and Assembly Guidelines

8.1 Lead Forming

• Bend leads at a point at least 3mm from the base of the epoxy bulb.
• Perform lead forming before soldering.
• Avoid stressing the package during forming to prevent internal damage or breakage.
• Cut leadframes at room temperature.
• Ensure PCB holes align perfectly with LED leads to avoid mounting stress.

8.2 Storage Conditions

• Store at ≤30°C and ≤70% Relative Humidity after receipt.
• Standard storage life is 3 months. For longer storage (up to 1 year), use a sealed container with nitrogen and desiccant.
• Avoid rapid temperature changes in humid environments to prevent condensation.

8.3 Soldering Recommendations

Maintain a minimum distance of 3mm from the solder joint to the epoxy bulb.

• Hand Soldering: Iron tip temperature ≤300°C (30W max), soldering time ≤3 seconds.
• Wave/Dip Soldering: Pre-heat ≤100°C (≤60 sec), solder bath ≤260°C for ≤5 seconds.

A recommended soldering temperature profile is provided to minimize thermal shock.

9. Packaging and Ordering Information

9.1 Packing Specification

LEDs are packed in anti-static bags to protect against ESD. Packing quantities are flexible: typically 200-500 pieces per bag, 5 bags per inner carton, and 10 inner cartons per master (outside) carton.

9.2 Label Explanation

Labels on packaging include codes for: Customer Part Number (CPN), Part Number (P/N), Quantity (QTY), combined ranks for Luminous Intensity and Forward Voltage (CAT), Color Rank (HUE), Reference (REF), and Lot Number (LOT No).

9.3 Model Number Designation

The part number 334-15/T2C5-1PSB follows a specific coding system where segments likely indicate the series, color (white), luminous intensity bin, forward voltage bin, and other attributes like packing style. The exact breakdown should be confirmed with the supplier for precise ordering.

10. Application Suggestions

10.1 Typical Applications

• Message Panels & Signage: High intensity makes it suitable for indoor and outdoor informational displays.
• Optical Indicators: Ideal for status indicators on equipment where high visibility is required.
• Backlighting: Can be used for edge-lit or direct backlighting of small panels, icons, or symbols.
• Marker Lights: Suitable for decorative lighting, position markers, or low-level area illumination.

10.2 Design Considerations

• Current Limiting: Always use a series resistor or constant current driver to limit forward current to the desired level (typically 20mA). Account for the forward voltage bin range when calculating resistor values.
• Thermal Management: Although power dissipation is modest, ensure adequate ventilation or heat sinking if operating at high ambient temperatures or near maximum current to maintain performance and lifespan.
• ESD Protection: Implement standard ESD handling procedures during assembly, as specified by the 4KV HBM rating.
• Optical Design: Consider the 50-degree viewing angle when designing lenses or light guides to achieve the desired beam pattern.

11. Technical Comparison and Differentiation

Compared to standard 5mm LEDs, this device emphasizes high luminous intensity. Its key differentiators are the specific InGaN chip technology and phosphor system optimized for brightness. The inclusion of detailed binning for intensity, voltage, and color provides designers with tighter control over application consistency compared to unbinned or broadly binned alternatives. The 4KV ESD rating offers better handling robustness than many basic LEDs.

12. Frequently Asked Questions (Based on Technical Parameters)

12.1 What is the recommended operating current?

The electro-optical characteristics are specified at 20mA, which is the typical recommended operating point for balancing brightness, efficiency, and longevity. It can be driven up to the absolute maximum of 30mA continuous, but with reduced efficacy and increased thermal stress.

12.2 How do I interpret the luminous intensity bins?

If your design requires a minimum brightness, select a bin where the \"Min.\" value meets your requirement. For example, choosing bin \"R\" guarantees an intensity between 4500 and 5650 mcd at 20mA. Using a higher bin (like \"S\") will generally yield brighter LEDs but may come at a higher cost.

12.3 Why is there a Zener Reverse Voltage parameter?

Some LED designs incorporate a reverse-protection Zener diode integrated into the package. The Vz parameter indicates the typical breakdown voltage of this protection device if present. It helps in understanding the reverse characteristics of the component.

12.4 How critical is the 3mm soldering distance rule?

This is very important. Soldering closer than 3mm to the epoxy body can transfer excessive heat, potentially cracking the epoxy lens, degrading the internal phosphor, damaging the wire bonds, or delaminating the chip. This directly impacts reliability and light output.

13. Operational Principle

This is a phosphor-converted white LED. An InGaN semiconductor chip emits blue light when forward biased (electroluminescence). This blue light strikes a layer of yellow (or yellow and red) phosphor particles embedded in the encapsulant. The phosphor absorbs some of the blue photons and re-emits light at longer wavelengths (yellow, red). The combination of the remaining blue light and the broad-spectrum phosphor emission is perceived by the human eye as white light. The exact shade (correlated color temperature) is determined by the ratio of blue to phosphor-converted light, controlled by the phosphor composition and concentration.

14. Technology Trends

The industry trend for discrete indicator LEDs like this one continues towards higher efficiency (more lumens per watt), improved color rendering index (CRI) for better color fidelity, and tighter binning tolerances for greater application consistency. There is also a drive towards more robust packaging to withstand higher temperature reflow soldering processes used in surface-mount assembly, although this particular device is a through-hole component. The underlying InGaN chip technology remains the industry standard for blue and white LEDs due to its high efficiency and reliability.