LED Indication - Discrete

Part Number	Description / PDF	Quantity
XZM2CRK54WA-8 SunLED	LED RED CLEAR CHIP SMD	31786
156125RS57000 Würth Elektronik Midcom	WL-SMRD SMD MONO-COLOR REVERSE M	3000
L955B-MWMC-Z American Opto Plus LED Corp.	3.5X2.8X 1.9MM PLCC2 SMD WHITE	580
SML-211DTT86 ROHM Semiconductor	LED ORANGE CLEAR 0805 SMD	6937
VLMP3102-GS08 Vishay / Semiconductor - Opto Division	LED GREEN CLEAR 2PLCC SMD	6
APA2107SURCK Kingbright	LED RED CLEAR SMD R/A	8287
HLMP-1401 Broadcom	LED YELLOW DIFFUSED T-1 T/H	4259
VLDR1235G Vishay / Semiconductor - Opto Division	LED RED CLEAR 2SMD	0
LTL-307AE Lite-On, Inc.	LED AMBER CLEAR T-1 3/4 T/H	6398
R50RED-4-0045 Califia Lighting (Bivar)	LED RED CLEAR T/H	31
XZDGK53W-3 SunLED	LED GREEN CLEAR 2SMD	53
5990091007F Dialight	LED BLUE 0603 SMD	13162
ASMB-BTE1-0B332 Broadcom	LED RGB DIFFUSED 4PLCC SMD	24093
QBLP612-IG QT Brightek	LED GREEN CLEAR 0802 SMD R/A	0
HSME-C191 Broadcom	LED GREEN DIFFUSED 0603 SMD	32850
LY M67F-T2V2-36-1-20-R18-Z OSRAM Opto Semiconductors, Inc.	LED YELLOW CLEAR SMD	0
5972222602F Dialight	LED YELLOW CLEAR 1208 SMD R/A	0
APTB1615YSGC-F01 Kingbright	LED GREEN/YELLOW CLEAR CHIP SMD	7447
VLMW41S1T2-LKML-08 Vishay / Semiconductor - Opto Division	LED COOL WHITE 2PLCC SMD	0
CMD1522SRUGCTR8 Visual Communications Company, LLC	LED GREEN/RED CLEAR 1206 SMD	25719

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