LED Indication - Discrete

Part Number	Description / PDF	Quantity
156125GS75000 Würth Elektronik Midcom	WL-SMRW SMD MONO-COLOR REVERSE M	2087
XZMOK55W-2 SunLED	LED ORANGE CLEAR 2SMD	0
150060VS75000 Würth Elektronik Midcom	LED GREEN CLEAR 0603 SMD	33310
LY L296-P1R2-26-Z OSRAM Opto Semiconductors, Inc.	LED YELLOW DIFFUSED 0603 SMD	2524
HLMP-6505-NP000 Broadcom	LED GREEN CLEAR AXIAL T/H AXIAL	0
APA1606SYCK Kingbright	LED YELLOW CLEAR CHIP SMD R/A	16766
SML-LX15IC-TR Lumex, Inc.	LED RED CLEAR SOT23 SMD	2107
CBQ33RRRRD ChromeLED	LED CBI 3MM 4X1 RED, RED, RED, R	1000
NTE30146 NTE Electronics, Inc.	LED-3MM RED DIFFUSED	6631
XZM2CYK60W SunLED	LED YELLOW CLEAR 2SMD	0
VLMY31K1L2-GS18 Vishay / Semiconductor - Opto Division	LED YELLOW CLEAR 2PLCC SMD	0
APB3025SYKCGKC-F01 Kingbright	LED GREEN/YELLOW CLEAR SMD	629
XLFBB12W SunLED	LED BLUE CLEAR T-1 3/4 T/H	0
LTL2H3KSK Lite-On, Inc.	LED YELLOW CLEAR T-1 3/4 T/H	214
TLHY4605 Vishay / Semiconductor - Opto Division	LED YELLOW DIFFUSED 3MM T/H	29
QBLP653-AG QT Brightek	LED YELLOW/GREEN CLEAR 1208 SMD	0
VLMO20J2M1-GS08 Vishay / Semiconductor - Opto Division	LED ORANGE CLEAR SMD MINILED SMD	26514
FHY3C64X-H Stanley Electric	LED YELLOW CLEAR ROUND T/H	25
CTL0402FGR1T-L Venkel LTD	LED 0402 FLAT LENS GREEN(YELLOW	39000
VLMV3100-GS18 Vishay / Semiconductor - Opto Division	LED GREEN/RED CLEAR 3PLCC 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