LED Indication - Discrete

Part Number	Description / PDF	Quantity
TLPY5600 Vishay / Semiconductor - Opto Division	LED YELLOW DIFF SIDE LED T/H R/A	3974
LTST-S220KFKT Lite-On, Inc.	LED ORANGE CLEAR SMD R/A	5400
SLR-343MGT32 ROHM Semiconductor	LED GREEN DIFFUSED T-1 T/H	611
SLA560BCT3F ROHM Semiconductor	LED BLUE CLEAR T-1 3/4 T/H	0
XZCBDMDKDG62W-2 SunLED	LED RGB CLEAR 4SMD	345
CTL0603FRD1T Venkel LTD	LED 0603 FLAT LENS RED	3999
WP7113SECK Kingbright	5MM ORANGE LED	898
QBLP1515-IG5 QT Brightek	LED GREEN 4PLCC SMD	0
IN-S121ASG Inolux	LED GREEN CLEAR 1208 SMD R/A	0
CMD91-21VYC/TR7 Visual Communications Company, LLC	LED YELLOW CLEAR GULL WING SMD	166
SLR343BC7TT32 ROHM Semiconductor	LED BLUE CLEAR T-1 T/H	0
MV64521 Everlight Electronics	LED GREEN CLEAR T-1 3/4 T/H	3745
COM-11450 SparkFun	LED RGB CLEAR T/H	122
L513GD-TR American Opto Plus LED Corp.	5MM YELLOW GREEN LED LAMP	109633
QBLP617-YG QT Brightek	LED YLW/GRN CLEAR 0602 SMD R/A	0
CS85BGT2C ChromeLED	LED GREEN CLEAR 0805 SMD	39
XLUY61D-A SunLED	LED YELLOW DIFFUSED T/H	0
XZFBB168W SunLED	1.8X0.6MM ULTRA BLUE DOME LENS R	25
LTST-C930KGKT Lite-On, Inc.	LED GREEN CLEAR CHIP SMD	0
200-BG Visual Communications Company, LLC	LED TH T-1 3/4 5MM 10MCD DIFFUSE	7156

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