LED Indication - Discrete

Part Number	Description / PDF	Quantity
SML-Z14PTT86A ROHM Semiconductor	LED GREEN CLEAR 2PLCC SMD	1484
SML-012YTT86A ROHM Semiconductor	LED YELLOW CLEAR 3020 SMD	1755
SML312BC4TT86 ROHM Semiconductor	LED BLUE CLEAR 0603 SMD	2624
SLR343WBD2PT3 ROHM Semiconductor	LED WHITE CLEAR T-1 T/H	2840
SML-A12Y8TT86 ROHM Semiconductor	LED YELLOW CLEAR 1611 SMD R/A	17882
SML-E12M8WT86 ROHM Semiconductor	LED GREEN DIFFUSED 0603 SMD	77157
SML-020MLTT86 ROHM Semiconductor	LED GREEN/RED CLEAR 1210 SMD	8402
SML-E12U8WT86 ROHM Semiconductor	LED RED DIFFUSED 0603 SMD	5243
SML-E12DWT86 ROHM Semiconductor	LED ORANGE DIFFUSED 0603 SMD	5641
SLR-332DCT32 ROHM Semiconductor	LED ORANGE CLEAR T/H	0
SML-210FTT86 ROHM Semiconductor	LED GREEN CLEAR 0805 SMD	0
SMLD12WBN1W1 ROHM Semiconductor	LED INDICATION SMD	7521
SML013WBD1 ROHM Semiconductor	LED WHITE CLEAR 3020 SMD	1425
SLR343WBD2PT31 ROHM Semiconductor	LED WHITE CLEAR T-1 T/H	2737
SML-010DTT86 ROHM Semiconductor	LED ORANGE CLEAR 3020 SMD	350
SLR-342DUTE7 ROHM Semiconductor	LED ORANGE DIFFUSED T/H	0
SLR-56MC3F ROHM Semiconductor	LED GREEN CLEAR T-1 3/4 T/H	7793
SML-M13YTT86 ROHM Semiconductor	LED YELLOW CLEAR 0805 SMD	3490
SML-Z14MTT86C ROHM Semiconductor	LED YELLOW/GREEN CLEAR 3528 SMD	1821
SML-D12U1WT86 ROHM Semiconductor	LED RED DIFFUSED 1608 SMD	234

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