LED Indication - Discrete

Part Number	Description / PDF	Quantity
R50RB2-4-0045 Califia Lighting (Bivar)	LED BLUE/RED CLEAR T/H	0
SMTL4-SBC Califia Lighting (Bivar)	LED GREEN/RED CLEAR 4PLCC SMD	22780
SMTL4-BC-RY Califia Lighting (Bivar)	LED RED/YELLOW CLEAR 4PLCC SMD	0
SM0402PGC Califia Lighting (Bivar)	LED GREEN CLEAR 0402 SMD	5823
R50RG2-5-0080 Califia Lighting (Bivar)	LED GREEN/RED CLEAR T/H	0
SMTL4-RGY Califia Lighting (Bivar)	LED GREEN/RED/YLW CLR 4PLCC SMD	35148
3BC-3-CA-F Califia Lighting (Bivar)	LED GRN/RED DIFF 3MM ROUND T/H	0
SM0605BC-Y/G Califia Lighting (Bivar)	LED GREEN/YELLOW CLEAR 0605 SMD	0
SM0402UWC Califia Lighting (Bivar)	LED WHITE DIFFUSED 0402 SMD	3700
R20GRN-F-0160 Califia Lighting (Bivar)	LED GREEN CLEAR T/H	9
1.8AD Califia Lighting (Bivar)	LED AMBER DIFFUSED 1.8MM T/H	0
SM1204UAC Califia Lighting (Bivar)	LED AMBER CLEAR 1204 R/A SMD	4716
SM1206UYC Califia Lighting (Bivar)	LED YELLOW CLEAR 1206 SMD	0
5SRD Califia Lighting (Bivar)	LED RED DIFFUSED T-1 3/4 T/H	4
R20BLU-4-0045 Califia Lighting (Bivar)	LED BLUE CLEAR T/H	108
SMTL2-GC Califia Lighting (Bivar)	LED GREEN CLEAR 2PLCC SMD	0
SMTL2-SUWD Califia Lighting (Bivar)	LED WHITE DIFFUSED 2PLCC SMD	0
SM0605RGB Califia Lighting (Bivar)	LED RGB CLEAR 0605 SMD	3684
SM0603RC Califia Lighting (Bivar)	LED RED CLEAR 0603 SMD	0
SM1204BC-R/G Califia Lighting (Bivar)	LED GREEN/RED CLEAR 1204 SMD R/A	42968

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