LED Indication - Discrete

Part Number	Description / PDF	Quantity
QBLP1515-IG5 QT Brightek	LED GREEN 4PLCC SMD	0
QBLP617-YG QT Brightek	LED YLW/GRN CLEAR 0602 SMD R/A	0
QBLP670D-IB QT Brightek	LED BLUE CLEAR 2PLCC SMD	1515
QBLP653-AG QT Brightek	LED YELLOW/GREEN CLEAR 1208 SMD	0
QBHP686-YH QT Brightek	2835 PLCC2 YELLOW WLD: 590NM TYP	3822
QBL8Y30C QT Brightek	LED YELLOW, T-1 3/4, 5MM, ROUND	10083
QBLP595-IW-2897 QT Brightek	LED WHITE DIFFUSED 0402 SMD	92804
QBLP653-IW QT Brightek	LED WHITE CLEAR 1208 SMD	0
QBLP676-IW-WW QT Brightek	LED WARM WHITE 3000K 2SMD	0
QBLP601-IG QT Brightek	LED GREEN CLEAR 0603 SMD	77403
QBL8RGB60D0-2897 QT Brightek	LED RGB, T-1 3/4, 5MM ROUND T/H,	6193
QBL7SA60D QT Brightek	LED DEEP RED 3MM ROUND T/H COLOR	238
QBL7IB60D QT Brightek	LED BLUE 3MM ROUND T/H COLOR DIF	8694
QBLP670-Y QT Brightek	LED YELLOW 2PLCC SMD	0
QBLP670-IW-NW QT Brightek	LED WHITE 2PLCC SMD	2593
QBL7R60D QT Brightek	LED RED 3MM ROUND T/H COLOR DIFF	0
QBLP650-O QT Brightek	LED ORANGE CLEAR 1206 SMD	0
QBHP686-IGH QT Brightek	2835 PLCC2 GREEN WLD: 525NM TYP.	3725
QBL8O30C QT Brightek	LED ORANGE, T-1 3/4, 5MM, ROUND	655
QBLP671-O QT Brightek	LED ORANGE 2PLCC SMD	9831

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