LED Indication - Discrete

Part Number	Description / PDF	Quantity
5977704607F Dialight	SM RED-GREEN 0605 PKG 7RL	0
5988C10107F Dialight	SM MINI PLCC2 RED 625NM	5770
5977725602F Dialight	SM YEL GREEN 0603 PKG SS	0
5973304607F Dialight	SMD 0603 GREEN .55MM THK	0
5977784602F Dialight	SMD 1206 REV MT O/B SMPL STR	0
5977741002F Dialight	SMD LED PLCC 0G SMPLE STRIP	0
5219658F Dialight	LED RED DIFF RECT 2MMX4MM T/H	0
5219249F Dialight	LED YELLOW CLEAR 5MM T/H	0
5219606F Dialight	LED GREEN DIFF RECT 2MMX4MM T/H	0
5219458F Dialight	LED GREEN/RED DIFFUSED 5MM T/H	0
5977722607F Dialight	LED GREEN/YELLOW CLEAR 1210 SMD	0
5972311402F Dialight	LED GREEN CLEAR 1208 SMD R/A	0
5219480F Dialight	LED RED DIFFUSED 5MM T/H	0
5218397F Dialight	LED GREEN/YELLOW DIFF 5MM T/H	0
5218009F Dialight	LED GREEN 5MM T/H W/STANDOFF	0
5972732602F Dialight	LED 0605 SMD R/A	0
5219664F Dialight	LED GREEN/RED DIFFUSED T-1 T/H	0
5219208 Dialight	LED DISCRETE LAMP	0
5973225307F Dialight	LED AMBER CLEAR 2PLCC SMD	0
5218012F Dialight	LED BLUE/GREEN DIFFUSED 3MM T/H	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