LED Indication - Discrete

Part Number	Description / PDF	Quantity
156120GS75000 Würth Elektronik Midcom	LED GREEN CLEAR 1206 SMD	402
156125GS57000 Würth Elektronik Midcom	WL-SMRD SMD MONO-COLOR REVERSE M	4071
155124RG73200 Würth Elektronik Midcom	LED GRN/RED CLEAR 2SMD R/A	8985
150161M153130 Würth Elektronik Midcom	WL-SFTD SMT FULL-COLOR TOP LED D	9620
150060VS73220 Würth Elektronik Midcom	LED GREEN CLEAR 0603 SMD	5447
150060GS75000 Würth Elektronik Midcom	LED GREEN CLEAR 0603 SMD	42906
150224SS73100 Würth Elektronik Midcom	LED RED CLEAR 2SMD	2831
150141SS63140 Würth Elektronik Midcom	WL-SMTD SMT MONO-COLOR TOP LED D	3908
155301RS73100 Würth Elektronik Midcom	WL-SMSW SMT MONO-COLOR SIDE VIEW	2723
156125RG73000 Würth Elektronik Midcom	LED GRN/RED CLEAR 4SMD BOTTOM	3092
155301VS73100 Würth Elektronik Midcom	WL-SMSW SMT MONO-COLOR SIDE VIEW	2915
155124RS73200 Würth Elektronik Midcom	LED RED CLEAR 1204 SMD R/A	20106
150060YS75000 Würth Elektronik Midcom	LED YELLOW CLEAR 0603 SMD	1645
156120AS82500 Würth Elektronik Midcom	LED AMBER CLEAR 2SMD	2343
150060YS86000 Würth Elektronik Midcom	WL-SMCW SMT MONO-COLOR CHIP LED	3601
150141RS73140 Würth Elektronik Midcom	WL-SMTW SMT MONO-COLOR TOP LED P	1998
150120AS75000 Würth Elektronik Midcom	LED AMBER CLEAR 1206 SMD	2636
150066RG74000 Würth Elektronik Midcom	WL-SBCW SMD BI-COLOR CHIP LED WA	3791
150120M173000 Würth Elektronik Midcom	WL-SFCW SMT FULL-COLOR CHIP LED	3755
156120GS82500 Würth Elektronik Midcom	LED GRN CLEAR 2SMD BOTTOM ENTRY	4339

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