Important Note

This entire repo was AI created - including all of the data within. The intent was to A) help me with my personal electronics inventory; and B) see how I could use AI to make that process a bit easier. DO NOT TRUST!

SMT LEDs

Overview

This collection contains surface mount technology (SMT) LEDs for compact lighting, status indication, and display applications in high-density PCB designs. These LEDs enable space-efficient lighting solutions with excellent optical performance and are essential for modern electronic devices requiring integrated illumination.

Available Components and Locations

Bin 44 - SMT LEDs (Cabinet 2)

Type	Package Size	Color	Brightness	Voltage	Current	Quantity	Applications
SMT LEDs	0603/0805/1206	Mixed	Various	1.8V-3.6V	2-20mA	Various	Status/lighting

Technical Specifications

Package Sizes and Dimensions

Standard SMT LED Packages

• 0603 (1608 metric): 1.6mm × 0.8mm × 0.8mm height
• 0805 (2012 metric): 2.0mm × 1.25mm × 1.1mm height
• 1206 (3216 metric): 3.2mm × 1.6mm × 1.1mm height
• 2835: 2.8mm × 3.5mm × 0.8mm height (high power)
• 3528: 3.5mm × 2.8mm × 1.9mm height (medium power)
• 5050: 5.0mm × 5.0mm × 1.6mm height (RGB/high power)

Optical Characteristics

• Viewing Angle: 120° to 160° typical
• Luminous Intensity: 10mcd to 1000mcd+
• Luminous Efficacy: 80-200 lm/W (white LEDs)
• Color Temperature: 2700K-6500K (white LEDs)
• CRI (Color Rendering Index): 70-95 (white LEDs)
• Wavelength: 380nm-780nm (colored LEDs)

Electrical Characteristics

Forward Voltage (Vf)

• Red: 1.8V - 2.2V typical
• Orange/Yellow: 2.0V - 2.4V typical
• Green: 2.8V - 3.4V typical
• Blue: 3.0V - 3.6V typical
• White: 3.0V - 3.6V typical
• UV: 3.2V - 4.0V typical

Forward Current (If)

• 0603 Package: 2-5mA typical, 20mA maximum
• 0805 Package: 5-10mA typical, 25mA maximum
• 1206 Package: 10-20mA typical, 30mA maximum
• High Power: 50mA to 1A+ for specialized packages
• Pulse Current: 2-5× continuous rating for short pulses

Thermal Characteristics

• Junction Temperature: 125°C maximum typical
• Thermal Resistance: 200-500°C/W depending on package
• Operating Temperature: -40°C to +85°C
• Storage Temperature: -40°C to +100°C
• Thermal Derating: Above 25°C ambient

Color Options and Specifications

Standard Colors

• Red: 620-630nm, high efficiency, low voltage
• Orange: 590-600nm, good visibility
• Yellow: 580-590nm, high visibility
• Green: 520-530nm, high efficiency
• Blue: 460-470nm, high brightness
• White: Phosphor-converted blue, various CCT

Specialized Colors

• Infrared: 850nm, 940nm for remote control
• UV: 365nm, 385nm, 405nm for curing/detection
• Pink: 625nm + phosphor
• Purple: 400-420nm
• Cyan: 490-510nm
• Lime: 560-570nm

RGB LEDs

• Package: Typically 5050 or larger
• Colors: Red, Green, Blue in single package
• Control: Individual control of each color
• Applications: Color mixing, displays, mood lighting
• Complexity: Requires 3-channel driver

Applications

Status Indication

• Power Indicators: System power and status
• Activity Indicators: Data transmission, processing
• Error Indicators: Fault and alarm conditions
• Mode Indicators: Operating mode display
• Battery Status: Charge level indication

Compact Lighting

• Backlighting: LCD/OLED display backlighting
• Accent Lighting: Decorative and accent lighting
• Task Lighting: Focused work area lighting
• Emergency Lighting: Backup and emergency illumination
• Automotive: Interior and exterior automotive lighting

Display Applications

• Dot Matrix: LED matrix displays
• Seven Segment: Numeric displays
• Bar Graphs: Level and progress indicators
• Pixel Displays: High-resolution LED displays
• Signage: Digital signage and billboards

Communication and Sensing

• Optical Communication: IR data transmission
• Proximity Sensing: IR proximity detection
• UV Applications: Curing, sterilization, detection
• Machine Vision: Illumination for cameras
• Spectroscopy: Specific wavelength sources

Design Guidelines

Current Limiting

• Resistor Calculation: R = (Vsupply - Vf) / If
• Constant Current: Use constant current drivers for precision
• Temperature Compensation: Account for Vf temperature coefficient
• Efficiency: Minimize power loss in current limiting
• Multiple LEDs: Series vs. parallel configurations

Thermal Management

• Heat Dissipation: Provide adequate heat sinking
• Thermal Vias: Use thermal vias under LED packages
• Copper Area: Maximize copper area for heat spreading
• Airflow: Ensure adequate airflow for cooling
• Derating: Derate current at high ambient temperatures

Optical Design

• Viewing Angle: Select appropriate viewing angle
• Optical Coupling: Optimize light coupling efficiency
• Reflectors: Use reflectors to direct light
• Diffusers: Use diffusers for uniform illumination
• Color Mixing: Design for proper color mixing (RGB)

PCB Layout

• Pad Design: Use recommended pad layouts
• Polarity: Clearly mark LED polarity
• Placement: Optimize placement for optical performance
• Routing: Minimize trace resistance and inductance
• Test Points: Provide test points for debugging

Assembly Guidelines

Reflow Soldering

• Temperature Profile: Use LED-compatible reflow profile
• Peak Temperature: Typically 245-260°C maximum
• Time Above Liquidus: Minimize time at high temperature
• Cooling Rate: Control cooling rate to prevent stress
• Multiple Passes: Avoid multiple reflow cycles

Solder Paste

• Paste Type: Use appropriate solder paste
• Stencil Design: Optimize stencil apertures
• Paste Volume: Control solder paste volume
• Flux Activity: Use appropriate flux activity level
• Storage: Proper solder paste storage

Component Handling

• ESD Protection: LEDs can be ESD sensitive
• Moisture Sensitivity: Some packages are moisture sensitive
• Orientation: Ensure correct polarity orientation
• Placement Pressure: Use appropriate placement pressure
• Vision Systems: Use vision systems for accurate placement

Testing and Quality Control

Optical Testing

• Luminous Intensity: Measure light output
• Color Coordinates: Verify color accuracy
• Viewing Angle: Test light distribution
• Color Temperature: Measure CCT for white LEDs
• CRI Testing: Color rendering index measurement

Electrical Testing

• Forward Voltage: Measure Vf at rated current
• Reverse Current: Test reverse leakage
• Thermal Testing: Test at elevated temperatures
• Life Testing: Long-term reliability testing
• Burn-in: Stress testing for early failures

Reliability Testing

• Temperature Cycling: Thermal stress testing
• Humidity Testing: Moisture resistance
• Vibration Testing: Mechanical stress
• Shock Testing: Impact resistance
• UV Exposure: UV degradation testing

Driver Circuits

Simple Current Limiting

• Resistor: Simple resistor current limiting
• Advantages: Low cost, simple design
• Disadvantages: Poor efficiency, temperature sensitivity
• Applications: Low-power status indicators
• Calculation: R = (Vsupply - Vf) / If

Constant Current Drivers

• Linear Regulators: Simple constant current
• Switching Regulators: High efficiency
• Integrated Drivers: Purpose-built LED drivers
• PWM Control: Brightness control via PWM
• Thermal Protection: Built-in thermal limiting

Advanced Control

• Color Control: RGB color mixing
• Dimming: Analog and PWM dimming
• Communication: I2C, SPI control interfaces
• Sensing: Current and temperature sensing
• Protection: Overcurrent and thermal protection

Troubleshooting

Common Issues

• No Light Output: Check polarity, current, voltage
• Dim Output: Verify current level, thermal issues
• Color Shift: Temperature effects, aging
• Flickering: Power supply issues, driver problems
• Premature Failure: Overcurrent, overtemperature

Failure Analysis

• Visual Inspection: Look for physical damage
• Electrical Testing: Measure Vf and If
• Thermal Imaging: Check for hot spots
• Optical Testing: Measure light output
• Microscopy: Detailed failure analysis

Prevention

• Proper Design: Follow design guidelines
• Quality Components: Use quality LEDs and drivers
• Thermal Management: Adequate heat dissipation
• Protection: Overcurrent and ESD protection
• Testing: Thorough testing and qualification

Storage and Handling

Storage Conditions

• Temperature: Room temperature storage
• Humidity: Low humidity environment
• Light: Protect from UV exposure
• Packaging: Keep in original packaging
• Inventory: First-in, first-out rotation

Handling Guidelines

• ESD Protection: Use ESD precautions
• Moisture Control: Control moisture exposure
• Contamination: Avoid contamination
• Physical Damage: Handle carefully
• Documentation: Maintain handling procedures

Package Contents

• Various SMT LEDs (mixed colors and packages)
• Multiple package sizes (0603, 0805, 1206 typical)
• Mixed colors (red, green, blue, white, etc.)
• Various brightness levels and specifications
• Suitable for status indication and compact lighting

Important Notes

• Polarity: LEDs are polarized - observe correct orientation
• Current Limiting: Always use appropriate current limiting
• Thermal Management: Provide adequate heat dissipation
• ESD Sensitive: Handle with ESD precautions
• Reflow Compatible: Designed for reflow soldering

Advantages

• Compact Size: Very small footprint
• High Efficiency: Excellent luminous efficacy
• Long Life: 50,000+ hour lifetime
• Fast Response: Instant on/off capability
• Low Voltage: Compatible with logic voltages
• Automation: Compatible with automated assembly

Limitations

• Heat Sensitive: Sensitive to excessive heat
• Current Dependent: Brightness depends on current
• Color Shift: Color can shift with temperature/age
• Directional: Light output is directional
• Driver Required: Requires current limiting/control
• Cost: Higher initial cost than incandescent

Recommended Applications

• Status Indicators: Equipment status and alerts
• Backlighting: Display and keypad backlighting
• Decorative Lighting: Accent and mood lighting
• Automotive: Dashboard and exterior lighting
• Consumer Electronics: Power and activity indicators
• Industrial: Machine status and process indicators