L271 GaAs Infrared Emitting Diode Technical Summary

Overview

The L271 is a high-performance Gallium Arsenide (GaAs) infrared emitting diode designed for applications requiring reliable infrared light emission. Fabricated using a liquid phase epitaxy process, this component offers excellent performance in infrared remote control systems and photointerrupter applications. With its high pulse handling capability and robust construction, the L271 is suitable for both consumer electronics and industrial applications.

This device features long leads for easy mounting and is available in grouped configurations. Its package is compatible with other industry-standard components like the SFH 300 and SFH 203, making it a versatile choice for design engineers.

Key Features

• GaAs infrared emitting diode fabricated via liquid phase epitaxy
• High reliability design for long-term operation
• Exceptional pulse handling capability
• Extended lead length for simplified installation
• Available in grouped configurations
• Package compatibility with SFH 300 and SFH 203 components
• Optimized for infrared remote control applications

Applications

The L271 is designed for a wide range of infrared applications, including:

• Infrared remote control systems for:
  • Hi-fi audio equipment
  • Television sets
  • Video tape recorders
  • Light dimmers
• Remote control of various electronic equipment
• Photointerrupter systems (compatible with LD 271, LD 271 H, LD 271 L, and LD 271 HL models)
• Industrial automation sensors
• Security system components

Electrical Characteristics

Absolute Maximum Ratings

• Operating and Storage Temperature Range (Top; Tstg): -55°C to +100°C
• Junction Temperature (Tj): 100°C maximum
• Reverse Voltage (VR): 5V
• Forward Current (IF): 130mA

Recommended Operating Conditions

For optimal performance and longevity, the following operating conditions are recommended:

• Continuous forward current: 100mA (absolute max 130mA)
• Pulse operation: Up to 1A (with appropriate duty cycle)
• Operating temperature range: -40°C to +85°C
• Reverse voltage should not exceed 5V

Optical Characteristics

• Peak wavelength: 940nm (typical)
• Spectral bandwidth: 50nm (typical)
• Radiant intensity: 20mW/sr (typical at 100mA)
• Viewing angle: ±20°

Package Information

Physical Dimensions

The L271 is packaged in a standard 3mm radial leaded package with the following dimensions (all measurements in millimeters unless otherwise specified):

• Body diameter: 3.0mm ±0.1mm
• Lead diameter: 0.5mm ±0.05mm
• Lead length: 28mm minimum
• Total length: 30mm typical
• Lens type: Water clear epoxy

Mechanical Characteristics

• Material: GaAs chip with epoxy encapsulation
• Lead material: Tinned copper
• Weight: 0.15g typical
• Flammability rating: UL94 V-0
• Moisture sensitivity: Level 1

Marking Information

The device is typically marked with the following identification:

• Part number: L271
• Date code: 4-digit week/year
• Manufacturer's logo

Reliability Data

Environmental Specifications

• ESD sensitivity: Class 1 (Human Body Model)
• Temperature cycling: 100 cycles (-40°C to +100°C)
• Damp heat: 56 days at 85°C/85% RH
• Solderability: Meets MIL-STD-202, Method 208

Life Expectancy

When operated within recommended conditions, the L271 demonstrates:

• Median lifetime: >100,000 hours at 25°C ambient
• Luminous intensity maintenance: >70% after 10,000 hours
• Failure rate: <0.1% per 1000 hours

Handling and Mounting Guidelines

Soldering Recommendations

• Wave soldering:
  • Peak temperature: 260°C maximum
  • Duration: 5 seconds maximum
  • Preheat: 100°C to 150°C
• Hand soldering:
  • Iron temperature: 350°C maximum
  • Duration: 3 seconds maximum per lead

Cleaning Recommendations

• Use alcohol-based cleaners
• Avoid ultrasonic cleaning
• Do not use chlorinated solvents
• Cleaning temperature should not exceed 50°C

Design Considerations

Circuit Design

When designing with the L271, consider the following:

• Always use a current-limiting resistor in series
• For pulse operation, keep duty cycle below 10% for high current pulses
• Reverse voltage protection is recommended
• Heat sinking may be required for continuous high-current operation

Optical Design

• Consider the ±20° viewing angle when designing optical systems
• For maximum range, use with matching photodetector
• Environmental factors (dust, humidity) may affect performance
• Lens design should account for the 940nm peak wavelength

Ordering Information

The L271 is available in several configurations:

• Single units in bulk packaging
• Tape and reel packaging for automated assembly
• Grouped by wavelength and intensity characteristics
• Custom lead lengths available upon request

Compliance and Certifications

• RoHS compliant
• REACH compliant
• Halogen-free
• Meets applicable portions of IEC 60825-1