LED Indication - Discrete

Image	Part Number	Description / PDF	Quantity	Rfq
	LTL77HTBK Lite-On, Inc.	LED BLUE CLEAR T/H	0
	LTL1CHTBJ3 Lite-On, Inc.	LED RADIAL LEAD T/H	0
	LTST-C281TGKT Lite-On, Inc.	LED GREEN CLEAR CHIP SMD	0
	LTST-M670KGKT Lite-On, Inc.	LED GREEN CLEAR 2PLCC SMD	0
	LTL-4262N Lite-On, Inc.	LED RED CLEAR T/H	0
	LTL-1HEDK Lite-On, Inc.	LED GREEN/YELLOW CLEAR T-1 T/H	0
	LTL1RMTGK6 Lite-On, Inc.	LED GREEN CLEAR T-1 T/H	0
	LTST-S271GKT Lite-On, Inc.	LED CHIP SMD R/A	0
	LTL42UB5N Lite-On, Inc.	LED BLUE DIFFUSED T-1 T/H	0
	LTW-4EMFDNJ2 Lite-On, Inc.	LED ORG/WHITE DIFF SQU LED T/H	0
	LTW-326DSKF-5A Lite-On, Inc.	LED ORANGE/WHITE CHIP SMD R/A	0
	LTL2V3EU3JS Lite-On, Inc.	LED RED CLEAR T/H	0
	LTL-16KG Lite-On, Inc.	LED GREEN DIFFUSED T-1 T/H	0
	LTL-433EA Lite-On, Inc.	LED ORANGE DIFFUSED T/H	0
	LTL1CHJSTNN Lite-On, Inc.	LED YELLOW CLEAR T/H	0
	LTL2F3KYK Lite-On, Inc.	LED YELLOW CLEAR T-1 3/4 T/H	0
	LTST-N683EGB Lite-On, Inc.	LED 4PLCC SMD	0
	LTST-S271FKT Lite-On, Inc.	LED CHIP SMD R/A	0
	LTW-4DMD6J Lite-On, Inc.	LED WHITE DIFFUSED T/H	0
	LTL-1254A Lite-On, Inc.	LED YELLOW DIFFUSED T/H	0

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