LED Indication - Discrete

Part Number	Description / PDF	Quantity
HLMP-HG64-VY0DD Broadcom	LED RED DIFFUSED 5MM OVAL T/H	0
CSM28G1CZ ChromeLED	LED GREEN CLEAR Z-BEND SMD	18
SML-LX2832SUGC-TR Lumex, Inc.	LED GREEN CLEAR 2832 SMD	278
SML-LX2835IYC-TR Lumex, Inc.	LED RED/YELLOW CLEAR 2835 SMD	1882
LTST-C191GKT Lite-On, Inc.	LED GREEN CLEAR CHIP SMD	1367
AA3528QBC/D Kingbright	LED BLUE CLEAR SMD	0
RPG1102W-660-TR Stanley Electric	LED GREEN CLEAR SMD	187633
APTD2012LCGCK Kingbright	LED GREEN CLEAR 2012 SMD	18960
LTL-4224 Lite-On, Inc.	LED RED CLEAR T-1 3/4 T/H	13062
SLR-322YY3F ROHM Semiconductor	LED YELLOW DIFFUSED T-1 T/H	214
SML-011UTT86 ROHM Semiconductor	LED RED CLEAR 3020 SMD	6
5977721202F Dialight	LED GREEN/YELLOW CLEAR 4PLCC SMD	0
LA L296-P1R2-1-0-20-R18-Z OSRAM Opto Semiconductors, Inc.	LED AMBER DIFFUSED 0603 SMD	0
7017X1 Visual Communications Company, LLC	LED RED DIFFUSED 0603 SMD	4150
5988510207F Dialight	LED GREEN/RED CLEAR 1208 SMD R/A	32
QBLP601-IG QT Brightek	LED GREEN CLEAR 0603 SMD	77403
LTL911VRKSA Lite-On, Inc.	LED RED CLEAR T/H	5477
5972603507F Dialight	LED BLUE CLEAR 0605 SMD R/A	3999
QBL8RGB60D0-2897 QT Brightek	LED RGB, T-1 3/4, 5MM ROUND T/H,	6193
WP1503SGC Kingbright	LED GREEN CLEAR T-1 3/4 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