LED Indication - Discrete

Part Number	Description / PDF	Quantity
SML-LX0303SIUPGUSB Lumex, Inc.	LED RGB CLEAR 4SMD	13134
SSL-LX3034GD Lumex, Inc.	LED GREEN DIFFUSED T-1 T/H	9810
SSL-LXA228GD-TR21 Lumex, Inc.	LED GREEN DIFFUSED AXIAL SMD	0
SML-LXR85GC-TR Lumex, Inc.	LED GREEN CLEAR SMD R/A	50662
SSL-LXA228USBCTR11 Lumex, Inc.	LED BLUE CLEAR AXIAL SMD	915
SML-LX1210IIC-TR Lumex, Inc.	LED RED CLEAR 1210 SMD	0
SML-LXIL0603UPGCTR Lumex, Inc.	1.64X0.84X1.15MM TOP VIEW SMT LE	18719
SML-LX2835IGC-TR Lumex, Inc.	LED GREEN/RED CLEAR 2835 SMD	9854
SML-LX2832SGC-TR Lumex, Inc.	LED GREEN CLEAR 2832 SMD	0
SML-LXFP0603UWW-TR Lumex, Inc.	LED WHITE DIFFUSED SMD	1326
SML-LX0603SYW-TR Lumex, Inc.	LED YELLOW DIFFUSED SMD	1035
SSL-LX3044SUGC Lumex, Inc.	LED GREEN CLEAR T-1 T/H	12926
SML-LXT0805SYW-TR Lumex, Inc.	LED YELLOW DIFFUSED SMD	11670
SML-LX0805SYC-TR Lumex, Inc.	LED YELLOW CLEAR SMD	3010
SLX-LX5093UWC/C Lumex, Inc.	LED WHITE CLEAR T-1 3/4 T/H	10190
SSL-LXA228YC-TR31 Lumex, Inc.	LED YELLOW CLEAR AXIAL SMD	37226
SML-LXR851SISGC-TR Lumex, Inc.	LED GRN/RED CLR SMD R/A	26058
SSL-LXA228SIC-TR11 Lumex, Inc.	LED RED CLEAR AXIAL SMD	134
SML-LXR44SRSUGC-TR Lumex, Inc.	LED GRN/RED CLEAR BOOMERANG SMD	184
SML-LXT0805SRW-TR Lumex, Inc.	LED RED DIFFUSED SMD	61554

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