3020 LED Chip Specification - Dimensions 3.0x2.0x0.8mm - Voltage 3.2V - Power 0.2W - White Backlight - English Technical Document

1. Product Overview

The 3020 series is a compact, high-performance surface-mount device (SMD) LED designed primarily for backlighting applications. This single-chip, 0.2W white LED offers a balance of efficiency, reliability, and cost-effectiveness, making it suitable for a wide range of consumer electronics, signage, and indicator applications where consistent white light output is required.

2. Technical Parameters Deep Dive

2.1 Absolute Maximum Ratings

The following parameters define the operational limits of the LED. Exceeding these values may cause permanent damage.

• Forward Current (IF): 90 mA (Continuous)
• Forward Pulse Current (IFP): 120 mA (Pulse width ≤10ms, Duty cycle ≤1/10)
• Power Dissipation (PD): 297 mW
• Operating Temperature (Topr): -40°C to +80°C
• Storage Temperature (Tstg): -40°C to +80°C
• Junction Temperature (Tj): 125°C
• Soldering Temperature (Tsld): 230°C or 260°C for 10 seconds (Reflow)

2.2 Electro-Optical Characteristics (Ts=25°C)

These are the typical performance parameters under standard test conditions.

• Forward Voltage (VF): 3.2 V (Typical), 3.4 V (Maximum) at IF=60mA
• Reverse Voltage (VR): 5 V
• Reverse Current (IR): 10 μA (Maximum)
• Viewing Angle (2θ1/2): 110° (Typical)

3. Binning System Explanation

To ensure color and brightness consistency in production, LEDs are sorted into bins based on key parameters.

3.1 Luminous Flux Binning

For the Cool White variant with a Color Rendering Index (CRI) of 80+, the luminous flux is measured at a forward current of 60mA.

• Code C9: 16 lm (Min) to 17 lm (Max)
• Code D1: 17 lm (Min) to 18 lm (Max)

Tolerance for luminous flux measurement is ±7%.

3.2 Forward Voltage Binning

LEDs are also binned according to their forward voltage drop at a specified current.

• Code B: 2.8 V to 2.9 V
• Code C: 2.9 V to 3.0 V
• Code D: 3.0 V to 3.1 V
• Code E: 3.1 V to 3.2 V
• Code F: 3.2 V to 3.3 V
• Code G: 3.3 V to 3.4 V

Tolerance for voltage measurement is ±0.08V.

3.3 Chromaticity Binning

The document defines specific chromaticity regions (e.g., Wa, Wb, Wc...) with coordinate boundaries (x, y) on the CIE 1931 diagram for color temperatures in the 10000-20000K range. This ensures LEDs from the same bin will have nearly identical perceived color. The allowable coordinate error is ±0.005.

4. Performance Curve Analysis

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

The I-V curve shows the relationship between the current flowing through the LED and the voltage across it. It is non-linear, characteristic of a diode. The typical forward voltage (Vf) is specified at 60mA. Designers use this curve to select appropriate current-limiting resistors or design constant-current drivers.

4.2 Forward Current vs. Relative Luminous Flux

This curve illustrates how light output increases with forward current. While output rises with current, efficiency typically decreases at higher currents due to increased thermal effects. Operating at or near the recommended 60mA ensures optimal balance between brightness and longevity.

4.3 Junction Temperature vs. Relative Spectral Power

This graph demonstrates the effect of junction temperature on the LED's spectral output. As temperature increases, the spectral power distribution can shift, potentially affecting color point (especially for white LEDs) and overall light output. Proper thermal management is crucial to maintain consistent performance.

4.4 Relative Spectral Power Distribution

The spectral curve plots the intensity of light emitted at each wavelength. For this white LED, the curve shows a broad peak in the blue region (from the chip's primary emission) combined with a broader yellow-green region from the phosphor coating. The combined output results in white light. Different correlated color temperatures (CCTs) like 2600-3700K (Warm White), 3700-5000K (Neutral White), and 5000-10000K (Cool White) have distinct spectral shapes.

5. Mechanical & Packaging Information

5.1 Outline Dimensions

The LED package has nominal dimensions of 3.0mm (Length) x 2.0mm (Width) x 0.8mm (Height). Detailed mechanical drawings with tolerances are provided: .X dimensions have a tolerance of ±0.10mm, and .XX dimensions have a tolerance of ±0.05mm.

5.2 Pad Layout & Stencil Design

Detailed pad layout (footprint) and recommended stencil aperture drawings are supplied to guide PCB design and solder paste application for optimal soldering yield and reliability. Correct pad design is essential for self-alignment during reflow and strong mechanical bonding.

6. Soldering & Assembly Guidelines

6.1 Moisture Sensitivity & Baking

This LED series is classified as moisture-sensitive according to IPC/JEDEC J-STD-020C. If the original moisture barrier bag is opened and the components are exposed to ambient humidity, they must be baked before reflow soldering to prevent "popcorn" damage.

• Baking Condition: 60°C for 24 hours.
• Post-Baking: Solder within 1 hour or store in a dry environment (<20% RH).
• Do not bake at temperatures exceeding 60°C.

6.2 Storage Conditions

• Unopened Bag: Temperature 5-30°C, Humidity <85% RH.
• Opened Bag: Temperature 5-30°C, Humidity <60% RH. Store in a sealed container with desiccant or a nitrogen cabinet.
• Floor Life: Use within 12 hours after opening the bag.

6.3 Reflow Soldering Profiles

Recommended temperature profiles are provided for both lead-free and leaded solder processes. All temperatures refer to measurements on the top surface of the LED package body.

• Lead-Free Profile: Peak temperature typically 230°C or 260°C, with time above liquidus (TAL) controlled.
• Leaded Profile: Lower peak temperature, with corresponding TAL.

Adhering to these profiles prevents thermal shock and ensures reliable solder joints without damaging the LED's internal structure or silicone encapsulant.

7. Application Notes & Design Considerations

7.1 ESD (Electrostatic Discharge) Protection

White LEDs are sensitive to electrostatic discharge. ESD can cause immediate failure (dead LED) or latent damage leading to reduced brightness, color shift, and shortened lifespan.

Protection Measures:

• Use grounded anti-static workstations and floors.
• Operators must wear anti-static wrist straps, gloves, and garments.
• Use ionizers to neutralize static charges.
• Employ ESD-safe packaging and handling materials.
• Ensure soldering equipment is properly grounded.

7.2 Circuit Design

Proper electrical design is critical for LED performance and longevity.

• Drive Method: Constant current drivers are strongly recommended over constant voltage sources to ensure stable light output and protect the LED from current spikes.
• Current Limiting: When using a voltage source, a series resistor is mandatory for each LED string to limit current. The preferred circuit design places one resistor per string rather than sharing one resistor across multiple parallel strings, as this improves current matching and reliability.
• Polarity: Always observe correct anode/cathode polarity during assembly to prevent reverse bias damage.
• Power-Up Sequence: Connect the LED to the driver output first, then energize the driver input to avoid voltage transients.

7.3 Handling Precautions

Physical handling can damage the LED.

• Avoid Fingers: Do not handle the silicone lens with bare fingers, as oils and moisture can contaminate the surface, reducing light output.
• Avoid Tweezers: Do not squeeze the silicone body with tweezers, as this can crush the wire bonds or the chip, causing immediate failure.
• Correct Pick-Up: Use vacuum pick-up tools with nozzles appropriately sized to the package's inner diameter to avoid pressing on the soft silicone.
• Avoid Dropping: Dropping can bend the leads, making soldering difficult and causing placement issues.
• Post-Reflow: Do not stack PCBs directly on top of each other after soldering, as this can scratch the lenses and potentially crush the LEDs.

8. Model Numbering Rule

The product naming convention allows for precise identification of LED characteristics:

Format: T □□ □□ □ □ □ – □□□ □□

• Package Code (e.g., 34): 34 corresponds to the 3020 package size. Other codes exist for 285, 3014, 3030, 5050, 3528, etc.
• Chip Count Code: "S" denotes a single small-power chip (as in this 0.2W product).
• Color Code: "W" is used for Cool White (>5000K). Other codes: L (Warm White), C (Neutral White), R (Red), etc.
• Optics Code: "00" for no primary lens, "01" for with lens.
• Luminous Flux Bin Code: e.g., C9, D1.
• Forward Voltage Bin Code: e.g., B, C, D, E, F, G.

9. Typical Application Scenarios

The 3020 0.2W white LED is ideally suited for applications requiring thin, uniform backlighting with moderate brightness.

• LCD Backlighting: Edge-lit or direct-lit backlight units for small to medium-sized LCD displays in appliances, industrial controls, and automotive interiors.
• Signage & Decorative Lighting: Light guides and channel letters where consistent white illumination is needed.
• General Indicator Lighting: Status indicators, panel lighting, and decorative accents in electronic devices.

10. FAQ Based on Technical Parameters

10.1 What is the recommended operating current?

The technical parameters and binning data are specified at 60mA. This is the recommended typical operating current to balance brightness, efficiency, and long-term reliability. It should not exceed the absolute maximum of 90mA continuous current.

10.2 Why is baking necessary before soldering?

The LED package absorbs moisture from the air. During the rapid heating of reflow soldering, this moisture can vaporize instantly, creating internal pressure that can delaminate the package, crack the silicone, or break wire bonds, leading to failure. Baking removes this absorbed moisture.

10.3 How do I select the correct voltage bin for my design?

Choose a voltage bin that aligns with your driver's output voltage range. Using LEDs from a tighter voltage bin (e.g., all from bin "D") in a parallel configuration will result in better current sharing and more uniform brightness compared to mixing bins with different forward voltages.

10.4 Can I drive this LED with a 3.3V or 5V supply directly?

No. The forward voltage varies (2.8V to 3.4V per bins). Connecting it directly to a fixed voltage source like 3.3V could cause excessive current in some LEDs (those with lower Vf) and insufficient current in others (those with higher Vf). You must use a constant current driver or a series current-limiting resistor calculated for the specific supply voltage and LED forward voltage.