LED Indication - Discrete

Part Number	Description / PDF	Quantity
SLR-332MC3F ROHM Semiconductor	LED GREEN CLEAR T-1 T/H	1778
VAOL-S4WR4 Visual Communications Company, LLC	LED WHITE DIFFUSED 0402 SMD	5110
XZCBD105S SunLED	LED BLUE CLEAR SMD	6161
156125YV73000 Würth Elektronik Midcom	LED GRN/YLW CLR 1205 SMD BOTTOM	2570
MT121NP-HR Marktech Optoelectronics	LED RED 5.5MM ROUND T/H	0
APT1608SYCK Kingbright	LED YELLOW CLEAR CHIP SMD	61383
QBL7IW60D-CW QT Brightek	LED COOL WHITE, T-1, 3MM ROUND T	5794
VCDG1111C-4BY3C-TR Stanley Electric	LED GREEN DIFFUSED	0
AM23ESGW Kingbright	LED GRN/RED DIFFUSED SOT23-3 SMD	13916
HLMP-6000-G0000 Broadcom	LED RED DIFF AXIAL T/H AXIAL	20735
HLMP-EG1A-Z10DD Broadcom	LED RED CLEAR T-1 3/4 T/H	13384
VLMV3100-GS08 Vishay / Semiconductor - Opto Division	LED GREEN/RED CLEAR 3PLCC SMD	10548
150040VS73220 Würth Elektronik Midcom	WL-SMCC SMT MONO-COLOR CHIP LED	8068
CLM3C-WKW-CWBYA453 Cree	LED COOL WHITE DIFF 2PLCC SMD	47474
SML-020MYTT86 ROHM Semiconductor	LED GREEN/YELLOW CLEAR 1210 SMD	0
SM0603GC Califia Lighting (Bivar)	LED GREEN CLEAR 0603 SMD	43532
NTE3142 NTE Electronics, Inc.	LED-3MM YELLOW	1482
HLMA-KL00-I0000 Broadcom	LED AMBER CLEAR T-1 T/H	0
HSMF-A205-A00J1 Broadcom	LED GREEN/ORANGE CLEAR 4PLCC SMD	18171
SMLP34RGB2W3 ROHM Semiconductor	LED RGB DIFFUSED PICOLED SMD	48094

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