SMD Mid-Power LED 67-24ST Datasheet - PLCC-2 Package - Forward Voltage 13.0V Max - 80mA - White Light - English Technical Documentation

1. Product Overview

The 67-24ST series is a surface-mount device (SMD) mid-power LED designed for a wide range of lighting applications. It utilizes a PLCC-2 (Plastic Leaded Chip Carrier) package, offering a compact form factor suitable for modern, space-constrained designs. The LED emits white light and is available in various correlated color temperatures (CCT) and color rendering index (CRI) values to meet diverse application needs.

Core advantages of this product include high luminous efficacy, which translates to more light output per unit of electrical power consumed. It features a wide viewing angle of 120 degrees, ensuring uniform light distribution. The product is compliant with key environmental and safety standards, including RoHS (Restriction of Hazardous Substances), EU REACH regulations, and is manufactured as halogen-free (with specific limits for Bromine and Chlorine).

The target market for this LED encompasses general illumination, decorative and entertainment lighting, indicator lights, switch illumination, and other applications requiring reliable, efficient, and compact light sources.

2. In-Depth Technical Parameter Analysis

2.1 Electro-Optical Characteristics

The performance of the LED is specified at a standard soldering point temperature of 25\u00b0C. The primary operating condition is a forward current (IF) of 80mA.

• Luminous Flux (\u03a6): The minimum luminous flux varies by product variant, with typical bins starting from 125 lumens (lm). The tolerance for luminous flux is \u00b111%.
• Forward Voltage (VF): The maximum forward voltage is 13.0V. The typical value is lower, and the tolerance is \u00b10.1V. This parameter is crucial for driver design and power supply selection.
• Color Rendering Index (Ra/CRI): Available with a minimum CRI of 80, with a tolerance of \u00b12. Higher CRI values indicate better color fidelity of illuminated objects.
• Viewing Angle (2\u03b81/2): The typical viewing angle is 120 degrees, defined as the angle where luminous intensity drops to half of its peak value.

2.2 Absolute Maximum Ratings

These ratings define the limits beyond which permanent damage to the device may occur. Operation should always be maintained within these limits.

• Forward Current (IF): 100 mA (continuous).
• Peak Forward Current (IFP): 200 mA, permissible only under pulsed conditions (duty cycle 1/10, pulse width 10ms).
• Power Dissipation (Pd): 1300 mW.
• Operating Temperature (Topr): -30\u00b0C to +85\u00b0C.
• Storage Temperature (Tstg): -40\u00b0C to +100\u00b0C.
• Thermal Resistance (Rth J-S): 12 \u00b0C/W (junction to soldering point). This is a key parameter for thermal management design.
• Junction Temperature (Tj): Maximum 115 \u00b0C.
• Soldering Temperature: Reflow soldering: 260\u00b0C for 10 seconds max. Hand soldering: 350\u00b0C for 3 seconds max. The device is sensitive to electrostatic discharge (ESD), requiring proper handling procedures.

3. Binning System Explanation

The LED is offered in pre-defined bins to ensure color and performance consistency in production. The product number itself encodes key bin information.

3.1 Product Number Structure

The model number 67-24ST/KKE-NXXXXX130Z8/SZM/2T can be decoded as follows:

• K: Indicates a minimum Color Rendering Index (CRI) of 80.
• NXX: Represents the Correlated Color Temperature (CCT) in hundreds of Kelvin (e.g., N271 = 2700K).
• XXX: Represents the minimum luminous flux in lumens (e.g., 251 = 125 lm, 301 = 130 lm).
• 130: Indicates the maximum forward voltage is 13.0V.
• Z8: Specifies the forward current rating of 80mA.

3.2 Luminous Flux Binning

Flux is binned using codes like S3B, S4A, etc. Each code defines a tight range of minimum and maximum luminous output (e.g., S3B: 125-130 lm) when measured at IF=80mA. This allows designers to select LEDs for consistent brightness levels.

3.3 Forward Voltage Binning

Forward voltage is binned with codes like A10, A15, etc., defining voltage ranges (e.g., A10: 11.0V-11.5V). Matching VF bins can help in designing more efficient driver circuits, especially for series-connected strings.

3.4 Chromaticity and CCT Binning

The datasheet provides detailed chromaticity coordinate (CIE x, y) ranges for different CCT values (2700K, 3000K, 3500K, etc.) on the CIE 1931 diagram. Bins are defined with high precision (e.g., 3-step and 5-step MacAdam ellipses for 2700K and 3000K, and specific 7-step quadrangles). This ensures very tight color consistency, which is critical in applications where uniform white light appearance is required across multiple LEDs.

4. Mass Production List & Ordering Guide

The datasheet lists specific part numbers available for mass production. These combine the various bins into standard offerings. Examples include:

• 67-24ST/KKE-N27125130Z8/SZM/2T: CRI 80 (min), CCT 2700K, Flux 125 lm (min), VF 13.0V (max), IF 80mA.
• 67-24ST/KKE-N30130130Z8/SZM/2T: CRI 80 (min), CCT 3000K, Flux 130 lm (min).
• Series are offered for different flux levels at each CCT (e.g., 125Lm series and 130Lm series for 2700K).

This list serves as a direct ordering guide, allowing engineers to select the exact combination of color temperature, brightness, and electrical characteristics needed for their project.

5. Application Suggestions and Design Considerations

5.1 Typical Application Scenarios

• General Lighting: Ideal for LED bulbs, tubes, and panel lights due to its efficacy and wide viewing angle.
• Decorative & Entertainment Lighting: Suitable for accent lighting, signage, and stage lighting where color quality (CRI) and consistent white point are important.
• Indicators & Switch Lights: Its compact size and reliability make it perfect for backlighting switches, control panels, and status indicators.

5.2 Critical Design Considerations

• Thermal Management: With a thermal resistance of 12\u00b0C/W, effective heat sinking is essential. The maximum junction temperature of 115\u00b0C must not be exceeded to ensure long-term reliability and maintain light output. The operating temperature range is -30\u00b0C to +85\u00b0C.
• Current Drive: The LED is designed for a nominal current of 80mA. A constant current driver is strongly recommended over a constant voltage source to ensure stable performance and prevent thermal runaway. The maximum continuous current is 100mA.
• ESD Protection: As a sensitive semiconductor device, proper ESD handling precautions must be observed during assembly and installation.
• Soldering: Adhere strictly to the reflow profile (260\u00b0C peak for 10s max) or hand soldering limits. Excessive heat or time can damage the internal die and phosphor.

6. Technical Comparison and Differentiation

While the PDF does not directly compare to other products, key differentiating features of the 67-24ST series can be inferred:

• Package: The PLCC-2 package offers a robust and proven SMD platform with good thermal and optical characteristics.
• Binning Rigor: The provision of detailed chromaticity coordinates (3-step, 5-step ellipses, 7-step quadrangles) indicates a focus on high color consistency, which is a significant advantage over LEDs with looser binning.
• Compliance: Full compliance with RoHS, REACH, and halogen-free standards makes it suitable for global markets with strict environmental regulations.
• Performance Balance: It offers a balanced combination of efficacy (lumens per watt), CRI (80+), and wide viewing angle, making it a versatile choice for many lighting applications rather than a specialist in just one area.

7. Frequently Asked Questions (Based on Technical Parameters)

Q1: What driver do I need for this LED?
A: You need a constant current driver capable of delivering 80mA. The output voltage of the driver must be higher than the total forward voltage of your LED string. For a single LED, the driver voltage should be >13.0V. For multiple LEDs in series, sum their maximum VF values.

Q2: How do I ensure consistent white color across multiple LEDs?
A: Order LEDs from the same CCT bin and, ideally, the same chromaticity sub-bin (e.g., same 3-step or 5-step ellipse code) as listed in the datasheet. This minimizes visible color differences.

Q3: Can I drive this LED at 100mA for more light?
A: The absolute maximum rating is 100mA continuous. While possible, driving at the maximum rating will generate more heat, reduce efficacy, and potentially shorten lifespan. It is recommended to design for the nominal 80mA and ensure excellent thermal management if considering higher currents.

Q4: What is the meaning of the tolerance figures (\u00b111% flux, \u00b10.1V VF)?
A: These are production tolerances. For example, an LED with a 125 lm min specification could actually measure between approximately 111 lm and 139 lm (125 \u00b1 11%). The binning system groups LEDs into tighter ranges from this wider production spread.

8. Practical Design and Usage Case

Case: Designing a 2700K Warm White LED Bulb
A designer is creating a 9W A19 LED bulb replacement. They plan to use 10 LEDs in a series-parallel configuration.

1. LED Selection: They choose part number 67-24ST/KKE-N27130130Z8/SZM/2T for its warm white (2700K) color, good CRI (80), and higher flux (130 lm min).
2. Electrical Design: They decide on two parallel strings of 5 LEDs each in series. Total current: 2 * 80mA = 160mA. Total forward voltage per string: 5 * ~12.5V (typ) = ~62.5V. The driver must provide 160mA constant current with an output voltage capability >5 * 13.0V = 65V.
3. Thermal Design: The total power is ~9W. They design an aluminum heatsink to keep the LED soldering points well below the maximum operating temperature, considering the thermal resistance path from the junction to the ambient.
4. Optical Design: The wide 120-degree viewing angle of the LED helps achieve the desired omnidirectional light distribution pattern for the bulb, potentially reducing the need for complex secondary optics.

9. Operating Principle Introduction

The 67-24ST LED is based on semiconductor light-emitting technology. The core is a chip made of indium gallium nitride (InGaN) materials. When a forward voltage is applied and current flows (80mA nominal), electrons and holes recombine within the semiconductor structure, releasing energy in the form of photons. The InGaN chip primarily emits light in the blue spectrum. This blue light then strikes a phosphor coating (contained within the water-clear resin encapsulant). The phosphor absorbs a portion of the blue light and re-emits it across a broader spectrum, primarily in the yellow region. The combination of the remaining blue light and the converted yellow light results in the perception of white light. The exact proportions of blue and yellow, controlled by the phosphor composition, determine the correlated color temperature (CCT) of the white light (e.g., 2700K warm white, 4000K neutral white, 6500K cool white).

10. Technology Trends and Context

The 67-24ST represents a mature and widely adopted class of mid-power LEDs. The trend in this segment continues to focus on several key areas:

• Increased Efficacy (Lumens per Watt): Ongoing improvements in chip design, phosphor technology, and package efficiency drive higher light output from the same electrical input, reducing energy consumption.
• Enhanced Color Quality: There is a growing demand for LEDs with higher Color Rendering Index (CRI), especially R9 (saturated red) values, and improved color consistency (tighter binning), moving beyond the 80 CRI minimum offered here.
• Improved Reliability and Lifetime: Advancements in materials (phosphors, encapsulants, substrates) and packaging aim to increase the operational lifetime and maintain light output (lumen maintenance) over longer periods.
• Miniaturization and Integration: While the PLCC-2 is standard, there is a trend towards even smaller packages and integrated modules (like COB - Chip-on-Board) for different application needs. The 67-24ST's strength lies in its balance of performance, cost, and ease of use in standard SMT assembly processes.
• Smart and Tunable Lighting: The broader market is moving towards LEDs that can dynamically adjust CCT and intensity. While this specific product is a fixed-color LED, it serves as a fundamental building block in many lighting systems.