LED Indication - Discrete

Part Number	Description / PDF	Quantity
SML-P12YTT86 ROHM Semiconductor	LED YELLOW CLEAR 1006 SMD	4293
SML-D15DWT86C ROHM Semiconductor	LED ORANGE 1608 SMD	5936
SML-D15YWT86C ROHM Semiconductor	LED YELLOW 1608 SMD	0
SLA560WBC7T3 ROHM Semiconductor	LED WHITE CLEAR T-1 3/4 T/H	585
SLA-570LT3F ROHM Semiconductor	LED RED T-1 3/4 T/H	396
SMLZ14WBEPW1 ROHM Semiconductor	LED WHITE DIFFUSED 2PLCC SMD	80
SML-P12UTT86 ROHM Semiconductor	LED RED CLEAR 1006 SMD	17796
SML-Z14DTT86C ROHM Semiconductor	LED ORANGE CLEAR 3528 SMD	1445
SML-P12M2TT86R ROHM Semiconductor	LED GREEN CLEAR 1006 SMD	5063
SML-020PDTT87 ROHM Semiconductor	LED GREEN/ORANGE CLEAR 1210 SMD	8076
SML512BC5TT86 ROHM Semiconductor	LED BLUE CLEAR 0603 SMD	0
SMLR13WBDW3 ROHM Semiconductor	LED WHITE DIFFUSED 16115 SMD R/A	94
SML-A12DTT86 ROHM Semiconductor	LED ORANGE CLEAR 1611 SMD R/A	2670
SML-A12WTT86 ROHM Semiconductor	LED YELLOW CLEAR 1611 SMD R/A	1912
SMLE12EC6TT86 ROHM Semiconductor	LED GREEN CLEAR 0603 SMD	9387
SML-D14WWT86C ROHM Semiconductor	LED YELLOW 1608 SMD	679
MSL0601RGBU1 ROHM Semiconductor	SMALL AND HIGH BRIGHTNESS SIDE-V	11992
SLR343EC4TT32 ROHM Semiconductor	LED BLUE-GREEN CLEAR T-1 T/H	1990
SLR-343DU3F ROHM Semiconductor	LED ORANGE DIFFUSED T/H	5240
SML-D13MWT86C ROHM Semiconductor	LED YELLOW/GREEN 1608 SMD	298

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