SMD LED 0201 Green Datasheet - Dimensions 0.6x0.3x0.25mm - Voltage 3.0-3.5V - Power 70mW - English Technical Document

1. Product Overview

This document details the specifications for a miniature Surface-Mount Device (SMD) Light Emitting Diode (LED) in the 0201 package size. These LEDs are designed for automated printed circuit board (PCB) assembly and are ideal for space-constrained applications. The device emits green light using InGaN (Indium Gallium Nitride) technology with a water-clear lens.

1.1 Features

• Compliant with RoHS (Restriction of Hazardous Substances) directives.
• Packaged on 12mm tape wound onto 7-inch diameter reels for automated pick-and-place.
• Standard EIA (Electronic Industries Alliance) package footprint.
• Input/output compatible with integrated circuits (I.C. compatible).
• Designed for compatibility with automatic placement equipment.
• Suitable for infrared (IR) reflow soldering processes.
• Preconditioned to JEDEC (Joint Electron Device Engineering Council) moisture sensitivity Level 3.

1.2 Applications

This LED is suitable for a wide range of electronic equipment where small size and reliable indication are required. Typical application areas include:

• Telecommunication devices (e.g., cordless phones, cellular phones).
• Office automation equipment (e.g., notebook computers, network systems).
• Home appliances and consumer electronics.
• Industrial control and instrumentation equipment.
• Status and power indicators.
• Backlighting for front panels, symbols, or small displays.
• Signal luminaries.

2. Technical Parameters: In-Depth Objective Interpretation

2.1 Absolute Maximum Ratings

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

• Power Dissipation (Pd): 70 mW. This is the maximum power the LED package can dissipate as heat without degradation.
• Peak Forward Current (I_FP): 100 mA. This is the maximum allowable instantaneous forward current, typically specified under pulsed conditions (1/10 duty cycle, 0.1ms pulse width) to prevent overheating.
• DC Forward Current (I_F): 20 mA. This is the recommended maximum continuous forward current for reliable long-term operation.
• Operating Temperature Range (T_opr): -40°C to +85°C. The ambient temperature range within which the LED will function according to its specifications.
• Storage Temperature Range (T_stg): -40°C to +100°C. The temperature range for storing the device when not powered.

2.2 Electrical and Optical Characteristics

These parameters are measured at an ambient temperature (T_a) of 25°C and define the typical performance of the device.

• Luminous Intensity (I_V): 300.0 - 600.0 mcd (millicandela) at I_F = 20mA. This measures the perceived brightness of the LED as seen by the human eye. The wide range indicates a binning system is used (see Section 3).
• Viewing Angle (2θ_1/2): 110 degrees (typical). This is the full angle at which the luminous intensity is half of the intensity measured on-axis (directly in front of the LED). A 110° angle provides a wide, diffuse light pattern.
• Peak Emission Wavelength (λ_p): 525 nm (typical). The wavelength at which the optical output power is maximum. Tolerance is +/- 1nm.
• Dominant Wavelength (λ_d): 525 - 535 nm at I_F = 20mA. This is the single wavelength that best represents the color perceived by the human eye, derived from the CIE chromaticity diagram.
• Spectral Line Half-Width (Δλ): 15 nm (typical). This is the spectral bandwidth measured at half the maximum intensity (Full Width at Half Maximum - FWHM). A value of 15nm indicates a relatively pure green color.
• Forward Voltage (V_F): 3.0 - 3.5 V at I_F = 20mA. The voltage drop across the LED when operating at the specified current. Tolerance is +/- 0.1V.
• ESD Withstand Voltage: 2 kV (Human Body Model - HBM). This indicates the LED's sensitivity to Electrostatic Discharge. A 2kV HBM rating is considered standard for basic ESD protection; handling with appropriate ESD precautions (wrist straps, grounded equipment) is strongly recommended.

3. Bin Rank System Explanation

To ensure consistency in production, LEDs are sorted (binned) based on key parameters. This allows designers to select parts that meet specific brightness and voltage requirements for their application.

3.1 Forward Voltage (V_F) Rank

LEDs are categorized into bins based on their forward voltage at 20mA. Each bin has a tolerance of +/- 0.10V.

• V1: 3.0V - 3.1V
• V2: 3.1V - 3.2V
• V3: 3.2V - 3.3V
• V4: 3.3V - 3.4V
• V5: 3.4V - 3.5V

3.2 Luminous Intensity (I_V) Rank

LEDs are categorized into bins based on their luminous intensity at 20mA. Each bin has a tolerance of +/- 11%.

• P2: 300 mcd - 400 mcd
• P3: 400 mcd - 500 mcd
• P4: 500 mcd - 600 mcd

4. Performance Curve Analysis

The datasheet references typical performance curves which are essential for understanding device behavior under different conditions. While specific graphs are not reproduced in text, their implications are analyzed below.

4.1 Current vs. Voltage (I-V) Characteristic

The I-V curve for an LED is non-linear, similar to a standard diode. The forward voltage (V_F) has a positive temperature coefficient, meaning it decreases slightly as the junction temperature increases. The specified V_F range (3.0-3.5V) is valid at 25°C and 20mA. Driving the LED at lower currents will result in a lower V_F, and vice versa.

4.2 Luminous Intensity vs. Forward Current

The light output (luminous intensity) is approximately proportional to the forward current (I_F) within the operating range. However, efficiency may drop at very high currents due to increased junction temperature and other effects. Operating consistently at the absolute maximum current (20mA DC) is not recommended for maximizing lifetime; derating to 15-18mA is a common practice for improved reliability.

4.3 Spectral Distribution

The spectral output curve centers around the peak wavelength of 525nm with a typical half-width of 15nm. The dominant wavelength (525-535nm) defines the perceived green color. Minor shifts in peak or dominant wavelength can occur with changes in drive current and junction temperature.

4.4 Temperature Characteristics

LED performance is temperature-dependent. Luminous intensity typically decreases as the junction temperature increases. The forward voltage also decreases with rising temperature. The operating temperature range of -40°C to +85°C defines the limits for guaranteed performance. For applications near the upper limit, thermal management on the PCB (e.g., thermal relief pads, limited duty cycle) may be necessary to maintain brightness and longevity.

5. Mechanical and Package Information

5.1 Device Dimensions

The LED conforms to the standard 0201 package footprint. Key dimensions (in millimeters) include a typical body length of 0.6mm, width of 0.3mm, and height of 0.25mm. Tolerances are typically ±0.2mm unless otherwise noted. The package features a water-clear lens.

5.2 Recommended PCB Attachment Pad Layout

A land pattern (footprint) is provided for infrared or vapor phase reflow soldering. This pattern is crucial for achieving a reliable solder joint, ensuring proper alignment, and managing heat dissipation during soldering. Following the recommended pad geometry helps prevent tombstoning (one end lifting) and ensures good solder fillets.

5.3 Polarity Identification

Polarity is typically indicated by a marking on the device or by an asymmetric feature in the package. The cathode is usually identified. Correct polarity must be observed during assembly, as reverse biasing the LED beyond its very low reverse breakdown voltage will not produce light and may damage the device.

6. Soldering and Assembly Guidelines

6.1 IR Reflow Soldering Profile

A suggested reflow profile compliant with J-STD-020B for lead-free processes is provided. Key parameters include:

• Pre-heat: 150-200°C for a maximum of 120 seconds to gradually heat the board and activate the solder paste flux.
• Peak Temperature: Maximum of 260°C. The time above liquidus (typically ~217°C for lead-free solder) should be controlled to minimize thermal stress on the LED.
• Total Soldering Time: Maximum of 10 seconds at peak temperature, with a maximum of two reflow cycles allowed.

It is critical to note that the optimal profile depends on the specific PCB design, solder paste, and oven. The provided profile serves as a generic target based on JEDEC standards.

6.2 Hand Soldering

If hand soldering is necessary, extreme care must be taken due to the small size. Recommendations include:

• Iron Temperature: Maximum 300°C.
• Soldering Time: Maximum 3 seconds per joint.
• Limit: One soldering cycle only. Excessive heat can damage the LED's internal structure and epoxy lens.

6.3 Cleaning

Cleaning should be performed with care. Only specified alcohol-based solvents like ethyl alcohol or isopropyl alcohol should be used. The LED should be immersed at normal temperature for less than one minute. Unspecified chemical cleaners may damage the package material or lens.

6.4 Storage and Moisture Sensitivity

This device is rated at Moisture Sensitivity Level (MSL) 3.

• Sealed Bag: Store at ≤30°C and ≤70% RH. The shelf life in the sealed moisture barrier bag with desiccant is one year.
• After Opening: Store at ≤30°C and ≤60% RH. Components should be subjected to IR reflow within 168 hours (7 days) of exposure to ambient air.
• Extended Storage (Opened): For storage beyond 168 hours, store in a sealed container with desiccant or in a nitrogen ambient.
• Rebaking: If components have been exposed for more than 168 hours, they must be baked at approximately 60°C for at least 48 hours before soldering to remove absorbed moisture and prevent \"popcorning\" (package cracking due to vapor pressure during reflow).

7. Packaging and Ordering Information

7.1 Tape and Reel Specifications

The LEDs are supplied in embossed carrier tape for automated handling.

• Tape Width: 12mm.
• Reel Diameter: 7 inches (178mm).
• Quantity per Reel: 4000 pieces.
• Minimum Order Quantity (MOQ): 500 pieces for remainder quantities.
• Cover Tape: Empty component pockets are sealed with a top cover tape.
• Missing Components: A maximum of two consecutive missing lamps is allowed per the specification.
• Standard: Packaging conforms to ANSI/EIA-481 specifications.

8. Application Suggestions and Design Considerations

8.1 Drive Method

LEDs are current-driven devices. To ensure stable light output and long life, they should be driven by a constant current source, not a constant voltage source. A simple series current-limiting resistor is the most common method when powered from a voltage rail. The resistor value (R) is calculated using Ohm's Law: R = (V_supply - V_F) / I_F. Use the maximum V_F from the bin or datasheet to ensure the current does not exceed the limit even with part-to-part variation.

8.2 Thermal Management

Although small, the LED generates heat at the semiconductor junction. For continuous operation at high currents or in high ambient temperatures, consider the PCB layout. Connecting the thermal pad (if applicable) or the cathode/anode pads to a larger copper area can help dissipate heat. Avoid placing the LED near other heat-generating components.

8.3 ESD Protection

With an ESD withstand voltage of 2kV (HBM), this LED has basic protection but is still susceptible to damage from electrostatic discharge. Implement ESD-safe handling procedures throughout production: use grounded workstations, wrist straps, and conductive floor mats. In the circuit design, for sensitive applications, consider adding transient voltage suppression (TVS) diodes or other protection components on signal lines connected to the LED.

8.4 Optical Design

The wide 110-degree viewing angle makes this LED suitable for applications requiring broad visibility. For focused light or specific beam patterns, secondary optics (lenses, light guides) will be necessary. The water-clear lens is optimal for the true color emission; diffused lenses are used when a softer, more uniform appearance is desired.

9. Technical Comparison and Differentiation

The primary differentiator for this component is its extremely small 0201 package size (0.6x0.3mm), enabling high-density PCB designs. Compared to larger packages like 0402 or 0603:

• Advantages: Minimal board space consumption, lower weight, potentially lower cost at high volumes due to material savings.
• Considerations: More challenging for manual assembly or rework. Slightly higher thermal resistance due to smaller size, which may require more careful thermal design for high-current operation. Optical light output is generally lower than larger packages with the same chip technology due to the smaller emitting area.
• Technology: The use of InGaN semiconductor material is standard for modern green, blue, and white LEDs, offering high efficiency and reliability compared to older technologies.

10. Frequently Asked Questions (Based on Technical Parameters)

10.1 What is the difference between Peak Wavelength and Dominant Wavelength?

Peak Wavelength (λ_p) is the physical wavelength where the LED emits the most optical power. Dominant Wavelength (λ_d) is a calculated value that represents the perceived color by the human eye based on the CIE color matching functions. For a monochromatic source like a green LED, they are often close, but λ_d is the more relevant parameter for color specification in displays and indicators.

10.2 Can I drive this LED at 30mA for higher brightness?

No. The Absolute Maximum Rating for DC Forward Current is 20mA. Exceeding this rating, even intermittently, can cause accelerated degradation of the light output (lumen depreciation), a color shift, or catastrophic failure due to overheating of the semiconductor junction. Always operate within the specified limits.

10.3 Why is there a binning system for V_F and I_V?

Manufacturing variations in the semiconductor epitaxy and chip processing lead to natural spreads in electrical and optical parameters. Binning sorts the produced LEDs into groups with tightly controlled characteristics. This allows designers to select a bin that ensures consistent brightness and voltage drop across all units in their product, which is critical for applications like multi-LED arrays or backlights where uniformity is key.

10.4 How critical is the 168-hour floor life after opening the bag?

Very critical for MSL 3 components. Absorbed moisture can turn to steam during the high-temperature reflow soldering process, causing internal delamination or cracking of the LED package (\"popcorning\"). Adhering to the 168-hour window or following the prescribed rebaking procedure is essential for assembly yield and long-term reliability.

11. Practical Application Case Study

Scenario: Designing a Status Indicator for a Wearable Device

A designer is creating a compact fitness tracker. A single, small LED is needed to indicate charging status (red/green would require a bi-color or two separate LEDs) and notification alerts.

• Part Selection: This 0201 green LED is chosen for its minimal footprint (0.6x0.3mm), saving precious space on the tightly packed flexible PCB.
• Drive Circuit: The device is powered by a 3.3V regulator. Using the maximum V_F of 3.5V for safety, a series resistor is calculated: R = (3.3V - 3.5V) / 0.02A = -10 Ohms. This is impossible, indicating the 3.3V supply is insufficient to forward-bias the LED at 20mA. The solution is to either: 1) Use a lower drive current (e.g., 10mA), recalculating with the corresponding V_F from the I-V curve (~2.9V), giving R = (3.3-2.9)/0.01 = 40 Ohms, or 2) Use a charge pump or boost converter to generate a higher voltage (e.g., 4.0V) for the LED circuit.
• Layout: The LED is placed on the edge of the PCB. The recommended solder pad layout is followed precisely in the CAD design. A small keep-out area under the LED is defined to prevent solder wicking.
• Assembly: The PCB assembly house uses the provided JEDEC-compliant reflow profile. The LEDs are stored in a dry cabinet after the bag is opened and assembled within 48 hours.
• Result: A reliable, bright status indicator that meets the size and power constraints of the wearable device.

12. Operating Principle Introduction

An LED is a semiconductor p-n junction diode. When a forward voltage is applied, electrons from the n-type region and holes from the p-type region are injected into the junction region. When these charge carriers (electrons and holes) recombine, energy is released. In a standard silicon diode, this energy is primarily released as heat. In a semiconductor material like Indium Gallium Nitride (InGaN) used in this LED, the energy bandgap is such that a significant portion of this recombination energy is released as photons (light). The specific wavelength (color) of the emitted light is determined by the bandgap energy of the semiconductor material. InGaN compounds can be engineered to produce light in the blue, green, and ultraviolet parts of the spectrum. The water-clear epoxy lens encapsulates the semiconductor chip, provides mechanical protection, and shapes the light output beam.

13. Technology Trends and Developments

The trend in SMD LEDs for indicator applications continues toward miniaturization, increased efficiency, and higher reliability. The 0201 package represents a mature but still widely used size for space-constrained designs. Ongoing developments include:

• Increased Efficiency: Improvements in epitaxial growth and chip design continue to yield higher luminous efficacy (more light output per electrical watt input), allowing for lower drive currents and reduced power consumption.
• Improved Thermal Performance: Advanced package materials and structures aim to lower thermal resistance, enabling higher drive currents or improved longevity in high-temperature environments.
• Color Consistency: Tighter binning tolerances and improved manufacturing processes lead to better color uniformity across production batches, which is critical for applications requiring matched colors.
• Integration: There is a trend toward integrating multiple LED chips (e.g., RGB for full color) into a single package or combining the LED with a driver IC, though this is more common in larger packages for lighting rather than miniature indicator types.
• Reliability Focus: Enhanced testing and qualification standards, along with improved materials, are pushing the rated lifetimes (L70, L50) longer, even in demanding automotive and industrial applications.