LED Indication - Discrete

Part Number	Description / PDF	Quantity
5988320804F Dialight	SMLED 1208 RO ANODE ON SPRKT	0
5988B80107F Dialight	SM LED 3528 GRN 525NM	3573
5973231207F Dialight	LED TOPLED 660NM AMBER 2-PLCC	0
5972111402F Dialight	LED RED RT ANGLE SMT	0
5977784607F Dialight	SMD 1206 REV MT O/B 7 REEL	0
5988B30107F Dialight	SM LED 3528 ORG 605NM	3900
5972401402F Dialight	LED YELLOW RT ANGLE SMT	0
5972901821F Dialight	LED COOL WHT CLEAR 1616 SMD R/A	0
5977713607F Dialight	SM R G B 2.1X1.6X0.55MM 7RL	0
5973006607F Dialight	LED RED CLEAR 0805 SMD	0
5988B90107F Dialight	SM LED 3528 BLUE 470NM	6814
5219322F Dialight	LED YELLOW DIFFUSED 3MM T/H	0
5973401402F Dialight	LED YELLOW CLEAR 1206 SMD	0
5973021407F Dialight	LED RED CLEAR 1206 SMD	0
5988360107F Dialight	LED YLW/GRN CLEAR 1208 SMD R/A	0
5973301207 Dialight	LED GREEN CLEAR 2PLCC SMD	0
5977721102F Dialight	LED GREEN/YELLOW CLEAR 4SMD	0
5219210 Dialight	LED GREEN DIFFUSED 3MM T/H	0
5988670207F Dialight	LED GREEN/RED CLEAR 1210 SMD	0
5988370102F Dialight	LED GREEN CLEAR 1208 R/A SMD	0

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