LED Indication - Discrete

Part Number	Description / PDF	Quantity
150224GS73100A Würth Elektronik Midcom	LED GREEN CLEAR 2SMD	0
APT3216SECK/J3-PRV Kingbright	LED RED CLEAR CHIP SMD	8878
5973301207F Dialight	LED GREEN CLEAR 2PLCC SMD	0
WP710A10SRD/F Kingbright	LED RED DIFFUSED T-1 T/H	26
LTL-307YE Lite-On, Inc.	LED YELLOW CLEAR T-1 3/4 T/H	81
EALP05RDGRA2 Everlight Electronics	5MM, WATERCLEAR	178
SML-LX2835SISUGSBC Lumex, Inc.	LED RGB CLEAR 2835 SMD	16600
SSL-LX5093PC Lumex, Inc.	LED PINK CLEAR T-1 3/4 T/H	9904
VLMO3100-GS18 Vishay / Semiconductor - Opto Division	LED ORANGE CLEAR 2PLCC SMD	0
LW Q38G-Q1OO-3K6L-1 OSRAM Opto Semiconductors, Inc.	LED COOL WHITE DIFFUSED 0603 SMD	0
HLMP1540 Everlight Electronics	LED GREEN CLEAR T-1 T/H	0
LW P473-Q2S1-FK0PN0-3B5A-10-R18-Z OSRAM Opto Semiconductors, Inc.	POINTLED	2644
XZMYK45WT-9 SunLED	LED YELLOW CLEAR 2PLCC SMD	1140
LO P47F-V2BB-24-1 OSRAM Opto Semiconductors, Inc.	LED ORANGE CLEAR 2SMD	4387
QBLP1515B-RGBA QT Brightek	LED RGB DIFFUSED 4PLCC SMD	7755
MT5470D-UY Marktech Optoelectronics	LED YELLOW DIFFUSED 5MM OVAL T/H	5018
HLMP-3401 Broadcom	LED YELLOW DIFFUSED T-1 3/4 T/H	0
WP710A10SYD Kingbright	LED YELLOW DIFFUSED T-1 T/H	2150
CL-505S-X-SD-T Citizen Electronics Co., Ltd.	LED TRI TOP FIRING 1.0 X 1.0	25303
5975213407F Dialight	LED ORANGE DIFFUSED 0603 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