LED Indication - Discrete

Part Number	Description / PDF	Quantity
SLR-343PC3F ROHM Semiconductor	LED GREEN CLEAR T/H	1579
SLR-322YYT32 ROHM Semiconductor	LED YELLOW DIFFUSED T/H	0
SML-825MVWT86 ROHM Semiconductor	REVERSE MOUNT AVAILABLE 2-COLOR	0
CSL1104WBAW1 ROHM Semiconductor	ULTRA COMPACT 0603 SIZE, HIGH IN	0
MSL0101RGBW1 ROHM Semiconductor	LED RGB DIFF SIDE VIEW SMD R/A	0
CSL0901YT ROHM Semiconductor	HIGH BRIGHTNESS LENS TYPE LED; C	625
SLR-342VCTB7 ROHM Semiconductor	LED RED CLEAR T/H	0
SLR343WBD2PT1 ROHM Semiconductor	LED WHITE CLEAR T/H	0
SLR-56YYTB7 ROHM Semiconductor	LED YELLOW DIFFUSED T/H	0
SMLP14WBCN1W1 ROHM Semiconductor	SMLP14WBCN1W IS 1006 (0402) SIZE	5000
SLR-56MGT32 ROHM Semiconductor	LED GREEN DIFFUSED T-1 3/4 T/H	1844
SML-S13VTT68 ROHM Semiconductor	LED RED 3216 SMD	1678
SLI-570YTT32 ROHM Semiconductor	LED YELLOW CLEAR T/H	0
SML-512CWT86A ROHM Semiconductor	LED ORANGE DIFFUSED 0603 SMD	0
CSL0901WT ROHM Semiconductor	HIGH BRIGHTNESS LENS TYPE LED; C	1466
SMLS14BETT86 ROHM Semiconductor	LED UNI-COLOR BLUE 2-PIN CHIP LE	1751
SML-S13DTT68 ROHM Semiconductor	LED ORANGE 3216 SMD	0
CSL0901PT ROHM Semiconductor	HIGH BRIGHTNESS LENS TYPE LED; C	41
SLR-56YCT32 ROHM Semiconductor	LED YELLOW CLEAR T-1 3/4 T/H	0
SML-S13VTT86 ROHM Semiconductor	LED RED 3216 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