LED Indication - Discrete

Part Number	Description / PDF	Quantity
151034BS03000 Würth Elektronik Midcom	LED BLUE CLEAR T/H	22729
150283GS73103 Würth Elektronik Midcom	WL-SMTW SMT MONO-COLOR TOP LED W	3347
150060YS55040 Würth Elektronik Midcom	LED YELLOW DIFFUSED 0603 SMD	19897
150040SS73220 Würth Elektronik Midcom	WL-SMCC SMT MONO-COLOR CHIP LED	3082
150353DS74500 Würth Elektronik Midcom	LED BLUE CLEAR 2SMD	1042
155124RS73200A Würth Elektronik Midcom	LED RED CLEAR 1206 SMD R/A	0
151033BS03000 Würth Elektronik Midcom	LED BLUE CLEAR 3MM ROUND T/H	8214
150060GS73220 Würth Elektronik Midcom	LED GREEN CLEAR 0603 SMD	3652
156125RV73000 Würth Elektronik Midcom	LED GRN/RED CLEAR 4SMD BOTTOM	943
155124VS73200A Würth Elektronik Midcom	LED GREEN CLEAR 1206 SMD R/A	0
150141RV73100 Würth Elektronik Midcom	LED GREEN/RED CLEAR 3528 SMD	6311
151034GS03000 Würth Elektronik Midcom	LED GREEN CLEAR T/H	6223
150066YV74000 Würth Elektronik Midcom	LED GREEN/YELLOW CLEAR 0606 SMD	7168
156125YS75000 Würth Elektronik Midcom	WL-SMRW SMD MONO-COLOR REVERSE M	2731
155060AS75300 Würth Elektronik Midcom	WL-SMSW SMT MONO-COLOR SIDE VIEW	3152
156120SS82500 Würth Elektronik Midcom	LED RED CLEAR 2SMD BOTTOM ENTRY	805
150040YS73220 Würth Elektronik Midcom	WL-SMCC SMT MONO-COLOR CHIP LED	427
150060RS73220 Würth Elektronik Midcom	LED RED CLEAR 0603 SMD	3796
151051BS04000 Würth Elektronik Midcom	LED BLUE DIFFUSED 5MM ROUND T/H	17409
155124GS73200 Würth Elektronik Midcom	LED GREEN CLEAR 1204 SMD R/A	8967

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