LED Indication - Discrete

Part Number	Description / PDF	Quantity
AM2520EC03 Kingbright	LED RED CLEAR SMD	6
C503B-ABN-CX0Y0341 Cree	LED AMBER CLEAR 5MM ROUND T/H	22
MV5454A Everlight Electronics	LED GREEN DIFFUSED T-1 3/4 T/H	0
CS85BW3C ChromeLED	LED WHITE CLEAR 0805 SMD	20
L955T-UPGC-Z American Opto Plus LED Corp.	3.5X2.8X0.7MM PLCC2 SMD GREEN	45
HSME-A401-P4PM1 Broadcom	LED GREEN CLEAR 4PLCC SMD	17805
VLDB1232G-08 Vishay / Semiconductor - Opto Division	DOME LENS SMD BLUE LED	3182
C503B-BCS-CW0X0452 Cree	LED BLUE CLEAR 5MM ROUND T/H	374
HTOV511040UB Inolux	LED BLUE DIFFUSED 5MM OVAL T/H	1909
LTW-2R3D7 Lite-On, Inc.	LED WHITE CLEAR T-1 3/4 T/H	22501
APG1608QBC/D Kingbright	LED BLUE CLEAR CHIP SMD	43913
SML-LX1206SRC-TR Lumex, Inc.	LED RED CLEAR 1206 SMD	88135
WP5603SYDLK/SD/J3 Kingbright	LED YELLOW DIFFUSED T/H	18881
C503B-RCS-CX0Y0AA2 Cree	LED RED CLEAR 5MM ROUND T/H	1229
SML-LX2832UWC-TR Lumex, Inc.	LED WHITE CLEAR 2832 SMD	4482
L152L-QOC-TR American Opto Plus LED Corp.	1206 ORANGE SMD LED	5781
APA3010ZGCK-GX Kingbright	LED GREEN CLEAR SMD R/A	1787
SSL-LX3044GD-5V Lumex, Inc.	LED GREEN DIFFUSED T-1 T/H	183
L950B-QEC-TR American Opto Plus LED Corp.	5X5X 1.8MM PLCC6 SMD RED	6
FKY1113F-TR Stanley Electric	LED YELLOW DIFFUSED	3738

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