LED Indication - Discrete

Part Number	Description / PDF	Quantity
APT3216LSECK/J3-PRV Kingbright	LED RED CLEAR 2SMD	9405
150141RS73100 Würth Elektronik Midcom	LED RED CLEAR 3528 SMD	5971
HSMQ-C170 Broadcom	LED GREEN DIFFUSED CHIP SMD	12587
BL-XKC361-TR7 American Bright	AXIAL YELLOW	29790
150353M153300 Würth Elektronik Midcom	LED RGB DIFFUSED 6PLCC SMD	146
XZM2CRK54WRP-1 SunLED	2.0X1.2MM ULTRA RED SMD 0805 LED	0
APBD3224LVBDSEKJ3C Kingbright	LED BLUE/RED CLEAR 4SMD	0
APDA3020LZGCK Kingbright	LED GREEN CLEAR 2SMD R/A	89231
LTST-C19FD1WT Lite-On, Inc.	LED BLUE/GRN/ORG DIFF CHIP SMD	72533
XLUR12D SunLED	LED RED DIFFUSED T-1 3/4 T/H	17478
LTH5MM12VFR4100 Visual Communications Company, LLC	LED RED CLEAR T-1 3/4 T/H	0
SML-D13FWT86 ROHM Semiconductor	LED GREEN DIFFUSED 0603 SMD	10091
APTB1612LSYKCGKC Kingbright	LED GREEN/YELLOW CLEAR 4SMD	0
QBLP670D-R QT Brightek	LED RED CLEAR 2PLCC SMD	1157
WP1503SGT Kingbright	LED GREEN CLEAR T-1 3/4 T/H	0
BL-BKC2V4V-AT American Bright	5MM YELLOW	19948
XLUR34D SunLED	LED RED DIFFUSED T-1 T/H	5817
HLMT-PH00 Broadcom	LED RED CLEAR FLAT TOP T/H AXIAL	312
BL-BJU334V-1 American Bright	5MM 625NM ORANGE RED; 6000MCD	19987
BL-BKC3V4V-AT American Bright	5MM YELLOW	19689

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