LED Indication - Discrete

Part Number	Description / PDF	Quantity
SML-012D8TT86 ROHM Semiconductor	LED ORANGE CLEAR 3020 SMD	1365
SMLE12BC7TT86 ROHM Semiconductor	LED BLUE CLEAR 0603 SMD	0
SLR-342MC3F ROHM Semiconductor	LED GREEN CLEAR T-1 T/H	13306
SLI-343YY3FW ROHM Semiconductor	LED YELLOW DIFFUSED T-1 T/H	0
SLR-342MCT32 ROHM Semiconductor	LED GREEN CLEAR T-1 T/H	1819
SMLK34WBEBW1 ROHM Semiconductor	LED WARM WHITE DIFF 4520 SMD	2283
SLR-322YC3F ROHM Semiconductor	LED YELLOW CLEAR T-1 T/H	0
SLI-325YYT31W ROHM Semiconductor	LED YELLOW DIFFUSED T-1 T/H	0
SML-010YTT86 ROHM Semiconductor	LED YELLOW CLEAR 3020 SMD	2752
SML-D15MWT86C ROHM Semiconductor	LED YELLOW/GREEN 1608 SMD	1776
SML-D13FWT86C ROHM Semiconductor	LED GREEN 1608 SMD	15515
SML-Z14MTT86A ROHM Semiconductor	LED GREEN CLEAR 2PLCC SMD	530
SLR-342MGT32 ROHM Semiconductor	LED GREEN DIFFUSED T-1 T/H	2040
SML-522MU8WT86 ROHM Semiconductor	LED GREEN/RED DIFFUSED 1315 SMD	5342
SLR-342VCT32 ROHM Semiconductor	LED RED CLEAR T-1 T/H	0
SML-D12M1WT86 ROHM Semiconductor	LED YLW/GREEN DIFFUSED 1608 SMD	148424
SMLD12E3N1WT86 ROHM Semiconductor	LED INDICATION SMD (UNDER TA=85C	5734
SML-E12UWT86 ROHM Semiconductor	LED RED DIFFUSED 0603 SMD	5057
SLR-343YC3F ROHM Semiconductor	LED YELLOW CLEAR T/H	1442
SLR-56VC3F ROHM Semiconductor	LED RED CLEAR T-1 3/4 T/H	3559

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