LED Indication - Discrete

Part Number	Description / PDF	Quantity
LW514 Seoul Semiconductor	LED WHITE ROUND 5MM T/H	60595
SFT722N-S Seoul Semiconductor	LED RGB 6PLCC SMD	195
STW8T36B Seoul Semiconductor	LED COOL WHITE SMD	0
HR335-JK-1,2-3,4,5,6,7 Seoul Semiconductor	LED RED 4DIP THROUGH HOLE	0
LW514-BULK Seoul Semiconductor	LED WHITE 5MM ROUND T/H	4527
LW520A Seoul Semiconductor	LED WHITE ROUND 5MM T/H	8000
SFT825Z-S Seoul Semiconductor	LED RGB DIFFUSED 6PLCC SMD	0
LW520AS Seoul Semiconductor	5MM WHITE LED	0
LY521 Seoul Semiconductor	LED YELLOW T-1 3/4 T/H	1637
LB520-A Seoul Semiconductor	LED BLUE CLEAR T/H	0
SFT825N-S Seoul Semiconductor	LED RGB DIFFUSED 6PLCC SMD	14982
LR521 Seoul Semiconductor	LED RED 5MM ROUND T/H	497
LR580A-BC-12 Seoul Semiconductor	LED RED CLEAR 5MM T/H	0
STW8T36B-P0Q5-FA-LOA Seoul Semiconductor	LED ADV TOPLED WHITE 6SMD	61200
LR530 Seoul Semiconductor	LED RED CLEAR T/H	0
LW551A Seoul Semiconductor	LED WHITE ROUND 5MM T/H	0
C9WT728S Seoul Semiconductor	LED NEUTRAL WHITE SMD	0
LW500AM Seoul Semiconductor	LED WHITE CLEAR 5MM T/H	0
C8WT728 Seoul Semiconductor	LED NEUTRAL WHITE SMD	0
LCW100Z1 Seoul Semiconductor	LED COOL WHITE SMD	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