LED Indication - Discrete

Part Number	Description / PDF	Quantity
WP57EYW Kingbright	LED RED/YELLOW DIFF T-1 3/4 T/H	236
XZMOK55W-3 SunLED	LED ORANGE CLEAR 2SMD	250
XZMYK168W SunLED	1.8X0.6MM YELLOW DOME LENS RIGHT	898
QBLP676-IW-WW QT Brightek	LED WARM WHITE 3000K 2SMD	0
WP132XYD Kingbright	LED YELLOW DIFFUSED T-1 T/H	8703
L955T-MUBC-Z American Opto Plus LED Corp.	3.5X2.8X0.7MM PLCC2 SMD BLUE	0
IN-S124ARUR Inolux	LED RED CLEAR 1204 SMD	14565
L121L-NEPGBW-3I American Opto Plus LED Corp.	RGB SMD LED WITH IC	0
L233QEC-TR American Opto Plus LED Corp.	SMD LED RIGHT ANGLE RED	45
AM2520SURC03 Kingbright	LED RED CLEAR SMD	6000
IN-S42ATA Inolux	LED AMBER CLEAR 0402 SMD	2740
5977752002F Dialight	LED GREEN/RED CLEAR 4PLCC SMD	0
BL-HUF33J-AV-TRB American Bright	1206 RED	20060
LS A67K-K1L2-1-Z OSRAM Opto Semiconductors, Inc.	LED RED CLEAR SMD R/A	4148
APT1608CGCK Kingbright	LED GREEN CLEAR CHIP SMD	1429405
WP710A10SURC/E Kingbright	LED RED CLEAR T-1 T/H	5890
SSL-LX5093HD-TR Lumex, Inc.	LED RED DIFFUSED T-1 3/4 T/H	719
5988510202F Dialight	LED GREEN/RED CLEAR 1208 SMD R/A	0
BR1111C-TR Stanley Electric	LED RED DIFFUSED 1608 SMD	30195
XZDG25X92S-4 SunLED	LED GREEN CLEAR CHIP 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