LED Indication - Discrete

Part Number	Description / PDF	Quantity
QBLP670-IB QT Brightek	LED BLUE 2PLCC SMD	715
QBLP613-IG QT Brightek	LED GREEN CLEAR 1204 SMD R/A	0
QBLP674-R QT Brightek	LED RED 2PLCC SMD	0
QBLP650-IW QT Brightek	LED WHITE CLEAR 1206 SMD	41010
QBL8IW40D-NW QT Brightek	LED NATURAL WHITE, T-1 3/4, 5MM	528
QBLP671-S QT Brightek	LED RED 2PLCC SMD	4638
QBL7IW60D-WW QT Brightek	LED WARM WHITE, T-1, 3MM ROUND T	3650
QBLP653-SAG QT Brightek	LED GREEN/RED CLEAR 1208 SMD	0
QBLP595-IG QT Brightek	LED GREEN CLEAR 0402 SMD	0
QBLP677-Y QT Brightek	LED YELLOW CLEAR 4PLCC SMD	0
QBLP670-S QT Brightek	LED RED 2PLCC SMD	0
QBLP674-IWM-CW QT Brightek	LED WHITE 2PLCC SMD	21379
QBHP686-IGN-2913 QT Brightek	2835 PLCC2 INGAN GREEN WLD=525NM	0
QBL8IW60D-CW QT Brightek	LED COOL WHITE, T-1 3/4, 5MM ROU	9426
QBLP674-IG QT Brightek	LED GREEN 2PLCC SMD	0
QBL7IW60D-NW QT Brightek	LED NATURAL WHITE, T-1, 3MM ROU	3856
QBLP670D-BG QT Brightek	LED CYAN CLEAR 2PLCC SMD	1793
QBLP615-AG QT Brightek	LED YLW/GRN CLEAR 1206 SMD R/A	0
QBL7IG60D QT Brightek	LED GREEN 3MM ROUND T/H COLOR DI	14209
QBLP653-Y QT Brightek	LED YELLOW CLEAR 1208 SMD	11053

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