LED Indication - Discrete

Part Number	Description / PDF	Quantity
LS L29K-H1J2-1-Z OSRAM Opto Semiconductors, Inc.	LED RED DIFFUSED 0603 SMD	40003
QBL7Y60D QT Brightek	LED YELLOW 3MM ROUND T/H COLOR D	937
AA3528SYSK Kingbright	LED YELLOW CLEAR SMD	8014
NTE30015 NTE Electronics, Inc.	LED-T-1 RIGHT ANGLE GREEN	279
CMD383UBC/H2 Visual Communications Company, LLC	LED BLUE CLEAR T-1 3/4 T/H	590
TLWY8900 Vishay / Semiconductor - Opto Division	LED YELLOW CLEAR 4DIP T/H	35
APHHS1005LSECK/J4-PF Kingbright	LED ORANGE CLEAR 2SMD	18048
LW E67C-T1V2-5K8L-1-30-R18-Z OSRAM Opto Semiconductors, Inc.	LED COOL WHITE DIFF 4PLCC SMD	36413
SML-D12D8WT86C ROHM Semiconductor	EXCELED SERIES CHIP LED	5034
5975202402F Dialight	LED ORANGE DIFFUSED 2SMD	1601
XZMYF151W SunLED	LED YELLOW CLEAR 2SMD R/A	15915
XZM2CYK55W-3 SunLED	LED YELLOW CLEAR 2SMD	7150
LTST-C190GKT Lite-On, Inc.	LED GREEN CLEAR CHIP SMD	132233
LTST-S310F2KT Lite-On, Inc.	LED RGB CLEAR SMD R/A	0
XZMER68W-3 SunLED	LED RED CLEAR 0402 SMD	4140
APF3236SEKJ3ZGKQBKC Kingbright	LED RGB CLEAR 6SMD	0
NTE30005 NTE Electronics, Inc.	LED-SMD 0603 RED	1476
QBL7O60D QT Brightek	LED ORANGE 3MM ROUND T/H COLOR D	864
150040GS73220 Würth Elektronik Midcom	WL-SMCC SMT MONO-COLOR CHIP LED	2750
150066M153000 Würth Elektronik Midcom	LED RGB DIFFUSED SMD	3436

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