LED Indication - Discrete

Part Number	Description / PDF	Quantity
SML-P12U2TT86R ROHM Semiconductor	LED RED CLEAR 1006 SMD	12593
NTE30156 NTE Electronics, Inc.	LED 5MM RGB COMMON CATH	2410
QTLP610C2TR Everlight Electronics	LED RED CLEAR SMD R/A	0
CTL1206DGR2T Venkel LTD	LED 1206 DOME LENS GREEN	0
LT E67C-T1V2-35-1-30-R18-Z OSRAM Opto Semiconductors, Inc.	LED GREEN CLEAR 4PLCC SMD	36
SSL-LX25783SRD Lumex, Inc.	LED RED DIFF RECT 2.3MMX7MM T/H	0
ASMB-MTB1-0A3A2 Broadcom	LED RGB DIFFUSED 4PLCC SMD	99001
LSM0603472V Visual Communications Company, LLC	LED SM 0603 2V -/150/-MCD YELLOW	15373
IN-S124BRYG Inolux	LED YELLOW/GREEN CLEAR 1204 SMD	0
XZCM2ACY45W-2HTA SunLED	3.5X2.8MM LC ULTRA YELLOW DOME L	90
C5SMF-RJF-CT0W0BB2 Cree	LED RED CLEAR 5MM OVAL T/H	26564
SML-LX0805GC-TR Lumex, Inc.	LED GREEN CLEAR SMD	1371
IN-S63AT5A Inolux	LED AMBER CLEAR 0603 SMD	3950
156120GS75000 Würth Elektronik Midcom	LED GREEN CLEAR 1206 SMD	402
LTST-C230TGKT Lite-On, Inc.	LED GREEN CLEAR CHIP SMD	4783
SMF-2432SIC-TR Lumex, Inc.	LED RED CLEAR SMD R/A	9487
IN-S85ATA Inolux	LED AMBER CLEAR 0805 SMD	2676
91-21SYGC/S530-E2/TR10 Everlight Electronics	LED YELLOW/GREEN CLEAR SMD	0
HLMP-K155 Broadcom	LED RED CLEAR T-1 T/H	7508
CSM28RR1CZ ChromeLED	LED RED CLEAR Z-BEND SMD	20

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