SMD Mid-Power LED 67-23ST Datasheet - PLCC-2 Package - Voltage 55V max - White Light - English Technical Document

1. Product Overview

The 67-23ST series is a compact, high-performance SMD (Surface-Mount Device) Mid-Power LED housed in a standard PLCC-2 (Plastic Leaded Chip Carrier) package. It is designed to emit white light across various correlated color temperatures (CCT). Its core advantages include high luminous efficacy, excellent color rendering capabilities (with CRI options up to 90 minimum), a wide 120-degree viewing angle, and low power consumption. The package is lead-free, halogen-free, and compliant with major environmental directives like RoHS and EU REACH, making it suitable for a broad range of general and decorative lighting applications where reliability and quality of light are paramount.

1.1 Target Applications

• General Indoor and Ambient Lighting
• Decorative and Architectural Lighting
• Entertainment and Stage Lighting
• Indicator and Backlighting Applications
• Switch and Control Panel Illumination

2. Technical Parameter Deep-Dive

2.1 Absolute Maximum Ratings

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

• Forward Current (I_F): 20 mA (Continuous)
• Peak Forward Current (I_FP): 40 mA (Pulsed, Duty Cycle 1/10, Pulse Width 10ms)
• Power Dissipation (P_d): 1100 mW
• Operating Temperature (T_opr): -40°C to +85°C
• Storage Temperature (T_stg): -40°C to +100°C
• Thermal Resistance (R_{th J-S}): 12 °C/W (Junction to Soldering Point)
• Maximum Junction Temperature (T_j): 115 °C
• Soldering Temperature: Reflow: 260°C for 10 sec max; Hand Soldering: 350°C for 3 sec max.

Note: This device is sensitive to Electrostatic Discharge (ESD). Proper ESD handling procedures must be followed during assembly and handling.

2.2 Electro-Optical Characteristics

Measured at a solder point temperature (T_soldering) of 25°C with a forward current (I_F) of 17mA, which is the typical operating condition.

• Luminous Flux (Φ): Minimum values range from 140 lm to 155 lm depending on CCT (see Mass Production List). Typical tolerance is ±11%.
• Forward Voltage (V_F): Maximum rating is 55.0V. Typical binning ranges from 50V to 55V. Tolerance is ±0.1V.
• Color Rendering Index (CRI/Ra): Minimum values from 60 to 90 are available (see CRI Index Table). For the mass production list, Ra (Min.) is 80. Tolerance is ±2.
• R9 Value: Specified as 0 (minimum) for the listed products, indicating a potential limitation in deep red saturation which is common for some white LED phosphor systems.
• Viewing Angle (2θ_1/2): 120 degrees (typical). This wide angle ensures uniform light distribution.

3. Binning System Explanation

The product uses an ANSI-standard binning system to ensure color and flux consistency. The part number contains codes for these bins.

3.1 Product Number Breakdown

Example: 67-23ST/KKE-H27140550Z2/2T

• 67-23ST/: Package type (PLCC-2).
• KKE: Internal code.
• H: CRI Index Code (H = CRI 90 Min.). For mass production models, 'H' corresponds to CRI 80 Min. (See CRI Table).
• 27: Color Temperature Code (27 = 2700K).
• 140: Minimum Luminous Flux Code (140 = 140 lm min).
• 550: Forward Voltage Index (550 = 55.0V max).
• Z2: Forward Current Index (Z2 = I_F 17mA).
• 2T: Packing quantity per reel (2T = specific reel count).

3.2 Chromaticity Coordinate Binning

The LED's white point (color) is tightly controlled within defined regions on the CIE 1931 chromaticity diagram. The datasheet provides specific (x, y) coordinate boxes for each CCT (2700K, 3000K, 3500K, etc.) and sub-bin (A, B, C...). For example, for 2700K, bins like 27K-A, 27K-B define different quadrilateral areas ensuring the emitted white light falls within a precise color range, typically within a 2- or 4-step MacAdam ellipse, guaranteeing minimal visual color difference between LEDs from the same bin.

3.3 Luminous Flux Binning

Flux is binned in steps. For instance, at 2700K:

• Bin 140L10: 140 lm (Min.) to 150 lm (Max.)
• Bin 150L10: 150 lm (Min.) to 160 lm (Max.)

3.4 Forward Voltage Binning

Voltage is binned in 1V steps from 50V to 55V (e.g., 50J: 50-51V, 51J: 51-52V). This helps in designing more efficient driver circuits by matching LED voltage ranges, potentially simplifying current regulation.

4. Performance Curve Analysis & Design Considerations

While specific graphs (IV, temperature vs. flux) are not provided in the excerpt, key relationships can be inferred from the parameters.

4.1 Current vs. Luminous Flux (L-I Relationship)

The luminous flux is specified at 17mA. Operating above this current (up to the absolute max of 20mA) will increase light output but also increase power dissipation (V_F * I_F) and junction temperature. The relationship is generally linear within a range, but efficiency (lumens per watt) may drop at higher currents due to increased heat.

4.2 Thermal Management

With a thermal resistance (R_{th J-S}) of 12°C/W, proper PCB thermal design is crucial. For example, at the rated 17mA and a typical V_F of ~52.5V, power dissipation is ~0.89W. The temperature rise from the solder point to the junction would be approximately 0.89W * 12°C/W = ~10.7°C. To keep the junction temperature (T_j) below 115°C, the solder point temperature must be maintained below ~104°C. This necessitates adequate copper area on the PCB (thermal pads) and possibly airflow in the final application.

4.3 Driver Design

The high forward voltage (up to 55V) suggests this LED likely contains multiple LED chips connected in series within the single package. A constant-current driver is mandatory, not a constant-voltage source. The driver must be designed to handle the maximum V_F of the selected voltage bin and provide a stable 17mA (or other designed current within limits).

5. Mechanical & Packaging Information

5.1 Package Outline

The device uses the common PLCC-2 surface-mount package. While exact dimensions (L x W x H) are not specified in the provided text, the PLCC-2 form factor is industry-standard. The top view is the primary emitting surface. The package resin is water-clear, which is optimal for achieving high light extraction efficiency and maintaining color consistency.

5.2 Polarity Identification

PLCC-2 packages typically have a marked cathode (often a green dot, a notch, or a cut corner on the lens or body). Correct polarity must be observed during PCB assembly. Reversed polarity will prevent the LED from illuminating and may stress the device.

6. Soldering & Assembly Guidelines

• Reflow Soldering: Maximum peak temperature of 260°C should not be exceeded for more than 10 seconds. A standard lead-free reflow profile is applicable.
• Hand Soldering: If necessary, the iron tip temperature should be limited to 350°C, and contact time should not exceed 3 seconds per pad to prevent thermal damage to the plastic package and the internal die attach.
• Storage: Store in dry, anti-static conditions within the specified storage temperature range (-40°C to +100°C).

7. Application Suggestions & Design Notes

7.1 Typical Application Circuits

These LEDs require an external constant current driver. A simple circuit involves a DC power supply, a switching constant-current LED driver IC, and the LED module. The driver IC must be selected based on the input voltage range, required output current (17mA), and the total forward voltage of the LED string (if multiple 67-23ST LEDs are used in series).

7.2 PCB Layout Considerations

• Thermal Pads: Design the PCB footprint with sufficient copper area connected to the LED's thermal pad (if present) or the cathode/anode pads to act as a heat sink. Thermal vias to inner or bottom layers can significantly improve heat dissipation.
• Electrical Isolation: Ensure proper creepage and clearance distances, especially given the relatively high operating voltage (up to 55V).

8. Technical Comparison & Differentiation

The 67-23ST differentiates itself through its combination of high voltage operation (simplifying series connections for higher voltage supplies), high CRI options (up to 90), and wide viewing angle. Compared to lower-voltage mid-power LEDs, it reduces the current requirement for a given power level, which can minimize resistive losses in traces and connectors. Its compliance with halogen-free and stringent environmental standards makes it suitable for eco-sensitive and demanding markets.

9. Frequently Asked Questions (Based on Parameters)

Q: Can I drive this LED with a 12V or 24V power supply directly?

A: No. The forward voltage is much higher (50-55V). A constant-current driver circuit that can boost the input voltage to exceed the LED's V_F is required.

Q: What does an R9 value of 0 mean for lighting quality?

A> A low or zero R9 value indicates the LED may not render deep red colors vividly. This is acceptable for many general lighting applications but might be a consideration for retail lighting (meat, produce, fabrics) or museum lighting where accurate red rendition is critical. Check the specific CRI bin for R9 specifications if available.

Q: How many LEDs can I connect in series?

A> It depends on your driver's maximum output voltage compliance. For example, with a driver rated for 150V max and using LEDs with a max V_F of 55V, you could theoretically connect 2 LEDs in series (110V max) with a safe margin. Always design with worst-case (Max. V_F) values.

10. Operating Principle & Technology

This is a phosphor-converted white LED. The core is a semiconductor chip based on InGaN (Indium Gallium Nitride) materials, which emits blue light when forward biased. This blue light excites a yellow (and often red) phosphor coating inside the package. The mixture of the remaining blue light and the converted yellow/red light results in the perception of white light. The exact blend of phosphors determines the Correlated Color Temperature (CCT - 2700K, 4000K, etc.) and the Color Rendering Index (CRI). The PLCC-2 package provides mechanical protection, environmental sealing, and houses the primary optical lens that shapes the 120-degree beam.