LED Indication - Discrete

Part Number	Description / PDF	Quantity
L152L-RC American Opto Plus LED Corp.	1206 DEEP RED SMD LED	46
L314ET American Opto Plus LED Corp.	3MM RED LED LAMP	9170
L199QOC-TR American Opto Plus LED Corp.	0403 ORANGE SMD LED	25
L171L-QBC-TR American Opto Plus LED Corp.	0805 BLUE SMD LED	0
L955T-UPGC-Z American Opto Plus LED Corp.	3.5X2.8X0.7MM PLCC2 SMD GREEN	45
L152L-QOC-TR American Opto Plus LED Corp.	1206 ORANGE SMD LED	5781
L950B-QEC-TR American Opto Plus LED Corp.	5X5X 1.8MM PLCC6 SMD RED	6
L171L-QOC American Opto Plus LED Corp.	0805 ORANGE SMD LED	7985
L423SRD American Opto Plus LED Corp.	2.4X7.1X7.8MM RECTANGULAR LED	41875
L150B-QEC American Opto Plus LED Corp.	3.2X1.6X1.1MM SMD LED (1206) RED	85
L196L-QBC-L American Opto Plus LED Corp.	0603 BLUE SMD LED -5MA	0
L170B-RC American Opto Plus LED Corp.	2.0X1.25X0.8 MM SMD LEDRED	100
L150B-SGC American Opto Plus LED Corp.	3.2X1.6X1.1MM SMD LED Y-GREEN	88
L152L-LWC American Opto Plus LED Corp.	1206 DEEP RED SMD LED	5843
L196L-QYC American Opto Plus LED Corp.	0603 YELLOW SMD LED	11641
L955B-MWMC-Z American Opto Plus LED Corp.	3.5X2.8X 1.9MM PLCC2 SMD WHITE	580
L170B-QYC-YB American Opto Plus LED Corp.	2.0X1.25X0.8 MM SMD LEDYELLOW	0
L513GD-TR American Opto Plus LED Corp.	5MM YELLOW GREEN LED LAMP	109633
L170B-QOC American Opto Plus LED Corp.	2.0X1.25X0.8 MM SMD LEDORANGE	200
L513SRD-C American Opto Plus LED Corp.	5MM RED LED LAMP	95282

LED Indication - Discrete

1. Overview

Discrete Light Emitting Diodes (LEDs) are single-chip optoelectronic devices that convert electrical energy into light through electroluminescence. This product category forms the foundation of modern indication systems, offering advantages including low power consumption, long lifespan, and high reliability. Their importance spans across consumer electronics, industrial equipment, automotive systems, and communication infrastructure.

2. Major Types and Functional Classification

Type	Functional Characteristics	Application Examples
Visible LEDs	Emits light in visible spectrum (400-700nm), available in multiple colors	Indicator lamps, display backlighting, decorative lighting
Infrared LEDs	Emits 700nm-1mm wavelength radiation, invisible to human eye	Remote controls, security sensors, night vision systems
High-Brightness LEDs	Enhanced luminous intensity (>1000mcd) with advanced packaging	Automotive lighting, outdoor displays, emergency signage
UV LEDs	Ultraviolet spectrum emission (280-400nm)	Sterilization equipment, counterfeit detection, curing systems

3. Structure and Composition

Typical discrete LED construction includes:

Die: Semiconductor chip (GaN/InGaN for blue/green, AlGaInP for red)
Encapsulation: Epoxy or silicone lens for light extraction and protection
Lead Frame: Copper or iron alloy for electrical connection and heat dissipation
Phosphor Coating: Used in white LEDs for wavelength conversion
Reflective Cup: Optimizes light directionality

4. Key Technical Parameters

Parameter	Significance	Typical Range
Wavelength	Determines light color and application suitability	375nm-940nm
Luminous Intensity	Measures brightness output (mcd)	50-10,000mcd
Forward Current	Operating current rating	20-150mA
Forward Voltage	Electrical potential drop	1.8-3.6V
Viewing Angle	Light emission spread measurement	5 -120

5. Application Fields

Primary application sectors include:

Consumer Electronics: Mobile phone indicators, keyboard backlighting
Automotive: Dashboard indicators, brake light systems
Industrial: Machine status indicators, safety signage
Medical: Diagnostic equipment indicators, phototherapy devices
Telecommunications: Network equipment status lights

6. Leading Manufacturers and Products

Manufacturer	Product Series	Key Features
Cree Inc.	XLamp XP-G3	High brightness (3200mcd), 120 viewing angle
OSRAM Opto	OSTAR Projection	High-power LED for automotive lighting
Nichia Corp.	NSHU5991	UV LED (365nm) for curing applications
Everlight Electronics	LTST-C19HE8WT	Tri-color LED for RGB indication

7. Selection Recommendations

Key consideration factors:

Spectral Requirements: Match wavelength to application needs
Environmental Conditions: Temperature range (-40 C to +85 C typical)
Power Constraints: Select appropriate current/voltage ratings
Optical Design: Consider lens type and viewing angle
Reliability: Check MTTF (Mean Time to Failure) specifications

Industry Development Trends

Current technology directions include:

Miniaturization: Development of micro-LED ( LED) with dimensions <50 m
Efficiency Improvement: Targeting >300lm/W efficacy for visible LEDs
Smart Integration: Incorporating driver ICs and sensors in LED packages
Material Innovation: GaN-on-silicon substrates for cost reduction
Regulatory Compliance: RoHS/REACH compliant packaging materials