CH1216-C8W80 LED Datasheet - 1.6x1.2mm SMD - 3.0V - 80mA - Cool/Warm White - English Technical Document

1. Product Overview

The CH1216-C8W80 is a high-reliability, surface-mount LED designed primarily for demanding automotive interior and ambient lighting applications. Its core advantage lies in the combination of a robust ceramic package, qualification to the stringent AEC-Q101 standard for automotive components, and compliance with environmental directives like RoHS, REACH, and halogen-free requirements. This makes it suitable for use in environments where thermal stress, mechanical vibration, and long-term reliability are critical factors. The target market is automotive Tier 1 suppliers and lighting module manufacturers requiring compact, reliable light sources for dashboard illumination, footwell lighting, accent lighting, and other cabin features.

2. In-Depth Technical Parameter Analysis

2.1 Photometric and Electrical Characteristics

The device is offered in two primary color temperatures: Cool White (5180K to 6680K) and Warm White (2580K to 3200K). At the typical drive current of 80mA, the Cool White variant delivers a typical luminous flux of 25 lumens, while the Warm White variant provides 22 lumens. Both have a wide 120-degree viewing angle, ensuring good spatial light distribution. The forward voltage (Vf) for both types is typically 3.00V at 80mA, with a specified range from 2.75V to 3.50V, representing the 99% production output. It is crucial for circuit designers to account for this Vf range to ensure consistent current regulation and brightness across production batches.

2.2 Absolute Maximum Ratings and Thermal Management

The absolute maximum ratings define the operational limits. The maximum continuous forward current is 120mA, and the device can handle surge currents up to 750mA for pulses ≤10μs. The maximum junction temperature (Tj) is 150°C. A key parameter for thermal design is the thermal resistance. The datasheet specifies two values: a real thermal resistance (Rth JS real) of 26 K/W and an electrical thermal resistance (Rth JS el) of 18 K/W. The electrical value is typically derived from the Vf temperature coefficient method and is often lower; designers should use the higher, real value for conservative thermal modeling. The forward current derating curve clearly shows that the maximum permissible continuous current drops as the solder pad temperature rises, reaching 80mA at 110°C.

2.3 Reliability and Environmental Compliance

The LED boasts an ESD withstand capability of up to 8 kV (HBM), enhancing its robustness against electrostatic discharge during handling and assembly. Its Moisture Sensitivity Level (MSL) is 2, indicating it can be stored for up to one year at ≤30°C/60% RH before requiring baking prior to reflow soldering. Full compliance with RoHS, REACH, and halogen-free standards (Br<900ppm, Cl<900ppm, Br+Cl<1500ppm) is confirmed. Additionally, the datasheet mentions sulfur robustness, a critical feature for automotive applications where sulfur-containing gases can corrode silver-plated components.

3. Binning and Part Number System

The product utilizes a binning system to categorize output based on key parameters, ensuring consistency for the end-user. While the full binning matrix is detailed in the datasheet, the primary bins relate to chromaticity coordinates (x, y) and luminous flux (Iv). The part number CH1216-C8W80801H-AM encodes specific bin selections. The \"C8W80\" segment indicates the product series and color combination (Cool and Warm White). The following digits (\"801\") typically specify the flux and chromaticity bin codes. The \"H\" denotes the packaging type (e.g., tape and reel). Understanding this nomenclature is essential for precise ordering to match the required optical performance.

4. Performance Curve Analysis

4.1 IV Curve and Luminous Efficacy

The Forward Current vs. Forward Voltage graph shows a characteristic exponential relationship. The Relative Luminous Flux vs. Forward Current graph indicates that light output increases sub-linearly with current. For the Cool White LED, relative flux is approximately 1.0 at 80mA (the reference point), increasing to about 1.35 at 120mA. The Warm White LED shows a slightly steeper increase. This non-linearity highlights the importance of stable current drive over voltage drive to maintain consistent brightness and color.

4.2 Temperature Dependence

The Relative Luminous Flux vs. Junction Temperature graph is critical for thermal design. Both Cool White and Warm White outputs decrease as junction temperature rises. At a Tj of 100°C, the relative flux drops to roughly 0.85 of its value at 25°C. The Forward Voltage has a negative temperature coefficient, decreasing by about 2mV/°C. The Chromaticity Coordinates Shift graphs show minimal movement with both current and temperature for the Cool White version, indicating good color stability. The Warm White version shows a more pronounced, though still controlled, shift in the x-coordinate with changing current, which should be considered in applications requiring strict color consistency.

4.3 Spectral Distribution

The Relative Spectral Distribution graph compares the emission spectra of the Cool White and Warm White LEDs. The Cool White spectrum shows a strong blue peak (from the LED chip) and a broad yellow phosphor emission. The Warm White spectrum has a diminished blue component and a more dominant, broader emission in the yellow-red region, resulting in its lower correlated color temperature (CCT) and warmer appearance. Both spectra contribute to a Color Rendering Index (CRI) greater than 80.

5. Mechanical, Packaging & Assembly Information

5.1 Dimensions and Polarity

The device uses a compact ceramic SMD package with dimensions of 1.6mm (length) x 1.2mm (width). The mechanical drawing specifies the exact footprint, including the location of the anode and cathode pads. Correct polarity orientation is marked on the device itself, typically with a cathode indicator. The recommended soldering pad layout is provided to ensure proper solder joint formation, thermal transfer, and mechanical strength.

5.2 Soldering and Handling Guidelines

A reflow soldering profile is specified, with a peak temperature of 260°C for up to 30 seconds. Adherence to this profile is necessary to prevent package cracking or degradation of internal materials. Due to its MSL 2 rating, devices exposed to ambient conditions for longer than the floor life must be baked before reflow. The \"Precaution for Use\" section likely covers handling to avoid ESD damage, storage conditions, and cleaning recommendations.

5.3 Packaging Specifications

The LEDs are supplied on tape and reel for automated assembly. The packaging information details the reel dimensions, tape width, pocket spacing, and orientation of components within the tape. This data is essential for programming pick-and-place machines correctly.

6. Application Guidelines and Design Considerations

6.1 Typical Application Circuits

For optimal performance and longevity, the LED must be driven by a constant current source, not a constant voltage source. A simple series resistor can suffice for basic applications with a stable supply voltage, but a dedicated LED driver IC is recommended for automotive applications due to the wide input voltage range (e.g., load dump conditions) and the need for dimming or fault protection. The driver should be selected to provide a stable 80mA (or less, if derated for thermal reasons) to the LED.

6.2 Thermal Design in Applications

Effective thermal management is paramount. The LED's performance and lifetime are directly tied to its junction temperature. The PCB should be designed with adequate thermal vias under the device's thermal pad, connected to a large copper pour or an internal ground plane to act as a heat spreader. In high-ambient-temperature environments like a car cabin, additional measures such as metal-core PCBs or active cooling may be necessary to keep the solder pad temperature within the derating curve limits.

6.3 Optical Integration

The 120-degree viewing angle makes this LED suitable for applications requiring wide, even illumination rather than a focused beam. For light guides or specific optical patterns, secondary optics (lenses, diffusers) will be required. The small package size allows for high-density placement in linear light bars or compact clusters.

7. Technical Comparison and Differentiation

Compared to standard plastic SMD LEDs, the ceramic package of the CH1216-C8W80 offers superior thermal conductivity, leading to lower junction temperature at the same drive current and thus higher long-term reliability and lumen maintenance. The AEC-Q101 qualification is a significant differentiator for automotive use, as it involves rigorous stress testing (high-temperature operating life, temperature cycling, etc.) that generic commercial-grade LEDs do not undergo. The explicit sulfur robustness testing further addresses a common failure mode in automotive environments that is often not specified for industrial LEDs.

8. Frequently Asked Questions (Based on Technical Parameters)

Q: Can I drive this LED at 120mA continuously?

A: Only if the solder pad temperature is kept at or below 103°C, as per the derating curve. At a typical ambient temperature inside a car, this likely requires exceptional thermal management. Operating at 80mA or lower is recommended for most designs.

Q: What is the difference between Rth JS real and Rth JS el?

A: Rth JS real is measured using a direct thermal method (e.g., with a thermal test chip) and is considered more accurate for heat flow modeling. Rth JS el is calculated from the change in forward voltage with temperature. Always use the higher Rth JS real value (26 K/W) for conservative thermal design.

Q: Is a current-limiting resistor enough for powering this LED in a car?

A: It can work for simple, non-dimmable applications if the input voltage is very stable. However, the automotive electrical system experiences significant transients (load dump, cold crank). A dedicated automotive-grade LED driver with over-voltage and reverse polarity protection is strongly recommended for reliable operation.

Q: How stable is the white color over temperature and current?

A: The Cool White version exhibits excellent color stability with minimal shift. The Warm White version shows a more noticeable shift in chromaticity, particularly with changing drive current. For applications where precise color matching is critical, binning selection and a stable, well-regulated current source are essential.

9. Design and Usage Case Study

Scenario: Automotive Door Pocket Lighting

A designer is creating an illuminated door pocket for a vehicle. The space is confined, ambient temperatures can reach 70°C, and the light must be uniform and warm in tone to match the cabin ambiance. The CH1216-C8W80 (Warm White bin) is selected for its compact size, AEC-Q101 reliability, and suitable color temperature. Four LEDs are placed in a linear array along the top edge of the pocket. The PCB is a standard FR4 board with a 2-oz copper layer and an array of thermal vias under each LED pad connected to a large ground plane. The LEDs are driven in a single series string by a buck-mode LED driver IC rated for automotive input voltage (6V to 40V), set to deliver 60mA to each LED—derated from 80mA to account for the high ambient temperature. A light guide with a micro-prismatic pattern is placed over the LEDs to diffuse the light evenly across the pocket. This design ensures reliable, long-lasting, and aesthetically pleasing illumination.

10. Operational Principle and Technology Trends

10.1 Basic Operating Principle

This LED is a solid-state light source based on a semiconductor chip, typically made of indium gallium nitride (InGaN) for the blue emitter. When a forward voltage exceeding the diode's threshold is applied, electrons and holes recombine within the semiconductor's active region, releasing energy in the form of photons—a process called electroluminescence. The primary light emitted is blue. To create white light, a portion of this blue light is absorbed by a phosphor coating (cerium-doped yttrium aluminum garnet or similar) deposited over the chip. The phosphor re-emits this energy as a broad spectrum of yellow light. The combination of the remaining blue light and the phosphor's yellow emission results in perceived white light. The exact ratio of blue to yellow emission, and the specific phosphor composition, determines the correlated color temperature (CCT), creating Cool White or Warm White variants.

10.2 Industry Trends

The trend in automotive interior lighting LEDs is towards higher efficiency (more lumens per watt), enabling brighter illumination or lower power consumption and thermal load. There is also a push for improved color rendering (higher CRI and R9 values) and tighter color consistency (smaller MacAdam ellipses) to meet premium aesthetic demands. Electrically, integration is increasing, with driver functionalities sometimes being co-packaged. Furthermore, the adoption of advanced phosphor technologies, such as volumetric phosphor or remote phosphor designs, continues to improve color uniformity and stability over angle and lifetime. The underlying drive for miniaturization and reliability, as exemplified by this ceramic-packaged device, remains constant.