LED Indication - Discrete

Part Number	Description / PDF	Quantity
156125YS57000 Würth Elektronik Midcom	WL-SMRD SMD MONO-COLOR REVERSE M	5750
155060VS73200 Würth Elektronik Midcom	WL-SMSW SMT MONO-COLOR SIDE VIEW	2568
150040RS73240 Würth Elektronik Midcom	LED RED CLEAR 0402 SMD	5591
150352M173300 Würth Elektronik Midcom	LED RGB CLEAR 6PLCC SMD	291
156125BS57000 Würth Elektronik Midcom	WL-SMRD SMD MONO-COLOR REVERSE M	3582
155301BS73100 Würth Elektronik Midcom	WL-SMSW SMT MONO-COLOR SIDE VIEW	7526
150060RS75000 Würth Elektronik Midcom	LED RED CLEAR 0603 SMD	336907
151031YS06000 Würth Elektronik Midcom	LED YELLOW DIFF 3MM ROUND T/H	9676
150302YS73100 Würth Elektronik Midcom	WL-SMTW SMT MONO-COLOR TOP LED W	2988
155060BS73200 Würth Elektronik Midcom	WL-SMSW SMT MONO-COLOR SIDE VIEW	3415
150505BS73300 Würth Elektronik Midcom	WL-SMTW SMT MONO-COLOR TOP LED W	920
150121M153000 Würth Elektronik Midcom	LED RGB DIFFUSED SMD	0
150141YV73110 Würth Elektronik Midcom	WL-SBTW SMT BI-COLOR TOP LED WAT	1990
150060YS73220 Würth Elektronik Midcom	LED YELLOW CLEAR 0603 SMD	4525
155060BS75300 Würth Elektronik Midcom	WL-SMSW SMT MONO-COLOR SIDE VIEW	2409
150060GS84000 Würth Elektronik Midcom	WL-SMCW SMT MONO-COLOR CHIP LED	238
151051RS11000 Würth Elektronik Midcom	LED RED DIFFUSED 5MM ROUND T/H	6136
150120SS75000 Würth Elektronik Midcom	LED RED CLEAR 1206 SMD	999
150060BS73220 Würth Elektronik Midcom	LED BLUE CLEAR 0603 SMD	3000
156120GS75300 Würth Elektronik Midcom	LED GREEN CLEAR 1206 SMD	5487

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