LED Indication - Discrete

Part Number	Description / PDF	Quantity
155060RS75300 Würth Elektronik Midcom	WL-SMSW SMT MONO-COLOR SIDE VIEW	3361
150141YS63130 Würth Elektronik Midcom	WL-SMTD SMT MONO-COLOR TOP LED D	1990
150141BS73130 Würth Elektronik Midcom	WL-SMTW SMT MONO-COLOR TOP LED P	1990
150040YS73240 Würth Elektronik Midcom	LED YELLOW CLEAR 0402 SMD	2762
150141RB73100 Würth Elektronik Midcom	LED BLUE/RED CLEAR 3528 SMD	1055
150141BS73113 Würth Elektronik Midcom	LED BLUE CLEAR 2PLCC SMD	402
150141GS73130 Würth Elektronik Midcom	WL-SMTW SMT MONO-COLOR TOP LED P	0
150141GS63130 Würth Elektronik Midcom	WL-SMTD SMT MONO-COLOR TOP LED D	1980
150141YB73100 Würth Elektronik Midcom	LED BLUE/YELLOW CLEAR 3528 SMD	843
150040AS73220 Würth Elektronik Midcom	WL-SMCC SMT MONO-COLOR CHIP LED	2563
150080SG54050 Würth Elektronik Midcom	WL-SBCD SMT BI-COLOR CHIP LED DI	2972
150066SV74000 Würth Elektronik Midcom	LED GREEN/RED CLEAR SMD	7616
150141GS73100 Würth Elektronik Midcom	LED GREEN CLEAR 3528 SMD	77061
150120YS75000 Würth Elektronik Midcom	LED YELLOW CLEAR 1206 SMD	217
156125VS75000 Würth Elektronik Midcom	WL-SMRW SMD MONO-COLOR REVERSE M	1114
156125M173000 Würth Elektronik Midcom	LED RGB CLEAR 4SMD BOTTOM ENTRY	6790
150066YV54050 Würth Elektronik Midcom	WL-SBCD SMT BI-COLOR CHIP LED DI	1930
150224BS73100A Würth Elektronik Midcom	LED BLUE CLEAR 2SMD	0
155060GS75300 Würth Elektronik Midcom	WL-SMSW SMT MONO-COLOR SIDE VIEW	2551
156120VS82500 Würth Elektronik Midcom	LED GRN CLEAR 2SMD BOTTOM ENTRY	650

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