LED Indication - Discrete

Part Number	Description / PDF	Quantity
SLR-342DUT32 ROHM Semiconductor	LED ORANGE DIFFUSED T-1 T/H	0
SML522BU1WT86 ROHM Semiconductor	LED BLUE/RED DIFFUSED 1315 SMD	7160
SML-D13MWT86A ROHM Semiconductor	MINI-MOLD CHIP LED	3
SML-Z14D4TT86 ROHM Semiconductor	LED ORANGE CLEAR 2PLCC SMD	0
SMLZN4BGTT86A ROHM Semiconductor	LED BLUE CLEAR 3528 SMD	0
SML-020MVTT87 ROHM Semiconductor	LED GREEN/RED CLEAR 1210 SMD	2202
SML-511UWT86 ROHM Semiconductor	LED RED DIFFUSED 0603 SMD	6991
SML-D12D8WT86C ROHM Semiconductor	EXCELED SERIES CHIP LED	5034
SLR-343MC3F ROHM Semiconductor	LED GREEN CLEAR T-1 T/H	1942
SML-M13PTT86 ROHM Semiconductor	LED GREEN CLEAR 0805 SMD	2263
SLR343WBC7T3 ROHM Semiconductor	LED WHITE CLEAR T-1 T/H	17973
SLI-343YY3F ROHM Semiconductor	LED YELLOW DIFFUSED T-1 T/H	0
SML-A12MTT86J ROHM Semiconductor	LED GREEN CLEAR 1611 SMD R/A	0
SML-020MVTT86 ROHM Semiconductor	LED GREEN/RED CLEAR 1210 SMD	1061
SML-D15MWT86 ROHM Semiconductor	LED YLW/GREEN DIFFUSED 1608 SMD	13093
SML013BDTT86 ROHM Semiconductor	LED BLUE CLEAR 3020 SMD	0
SML-Z14U4TT86 ROHM Semiconductor	LED RED CLEAR 2PLCC SMD	1
SML-D15U2WT86C ROHM Semiconductor	LED RED 1608 SMD	3359
SML-A12V8TT86 ROHM Semiconductor	LED RED CLEAR 1611 SMD R/A	5564
SLI-560DT3F ROHM Semiconductor	LED ORANGE CLEAR T-1 3/4 T/H	796

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