LED Indication - Discrete

Part Number	Description / PDF	Quantity
SML-LX2832YC-TR Lumex, Inc.	LED YELLOW CLEAR 2832 SMD	5807
IN-S85DATRG Inolux	LED GREEN/RED CLEAR 0805 SMD	72497
LTL-4291N Lite-On, Inc.	LED ORANGE DIFFUSED T-1 T/H	14701
LTST-S220TBKT Lite-On, Inc.	LED BLUE CLEAR SMD R/A	81188
SLR-342DUT32 ROHM Semiconductor	LED ORANGE DIFFUSED T-1 T/H	0
XLMDK01D SunLED	10MM RED LED	0
LTST-C190KFKT Lite-On, Inc.	LED ORANGE CLEAR CHIP SMD	4521
16-219AUTD/S3151/TR8 Everlight Electronics	LED WHITE DIFFUSED 2SMD	11699
XLMDKCBD59M SunLED	LED BLUE/RED DIFF T-1 3/4 T/H	4045
LTST-C171TGKT Lite-On, Inc.	LED GREEN CLEAR CHIP SMD	8844
SML522BU1WT86 ROHM Semiconductor	LED BLUE/RED DIFFUSED 1315 SMD	7160
5988191102F Dialight	LED BLUE CLEAR 0805 SMD	108
AA1112H-TR Stanley Electric	LED ORANGE DIFFUSED 2125 SMD	2537
5973403602F Dialight	LED YELLOW CLEAR 1206 SMD	0
B1591USD-20C001922U1930 Harvatek Corporation	3.2(L)X1.6(W)X1.85(H) MM REVERSE	0
APTD1608LSECK/J4-PF Kingbright	LED ORANGE CLEAR 2SMD	21436
4301F1/5-A Visual Communications Company, LLC	LED GREEN/RED DIFFUSED T-1 T/H	150
LY T64F-CADB-46-1-Z OSRAM Opto Semiconductors, Inc.	LED YELLOW CLEAR 2PLCC SMD	0
APA2107SECK/J3-PRV Kingbright	LED RED CLEAR SMD R/A	7759
XSUY18D SunLED	LED YELLOW DIFF RECT 2MMX5MM T/H	9800

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