LED Indication - Discrete

Part Number	Description / PDF	Quantity
SML813WBC8W1 ROHM Semiconductor	LED COOL WHITE DIFFUSED 3412 SMD	4938
SML-011VTT86A ROHM Semiconductor	LED RED CLEAR 3020 SMD	0
SML-D12D1WT86 ROHM Semiconductor	LED ORANGE DIFFUSED 1608 SMD	13528
SLR-56DC3F ROHM Semiconductor	LED ORANGE CLEAR T-1 3/4 T/H	902
SLI-325URT31W ROHM Semiconductor	LED RED DIFFUSED T-1 T/H	0
SML-P11MTT86R ROHM Semiconductor	LED GREEN-YELLOW CLEAR 1006 SMD	7201
SLR-56MG3F ROHM Semiconductor	LED GREEN DIFFUSED T-1 3/4 T/H	6423
SMLK19WBECW1 ROHM Semiconductor	LED WHITE DIFFUSED 4520 SMD	659
SLR-342DCT32 ROHM Semiconductor	LED ORANGE CLEAR T-1 T/H	0
SML-010FTT86 ROHM Semiconductor	LED GREEN CLEAR 3020 SMD	7049
SLI-570UT3F ROHM Semiconductor	LED RED CLEAR T-1 3/4 T/H	60186
SLR-332VRT32 ROHM Semiconductor	LED RED DIFFUSED T-1 T/H	1940
SML-521MYWT86 ROHM Semiconductor	LED GRN/YELLOW DIFFUSED 1315 SMD	2956
SLI-560YT3F ROHM Semiconductor	LED YELLOW CLEAR T-1 3/4 T/H	882
SML310BATT86 ROHM Semiconductor	LED BLUE CLEAR 0603 SMD	0
SLI-343URC3FW ROHM Semiconductor	LED RED CLEAR T-1 T/H	0
SML-310LTT86 ROHM Semiconductor	LED RED CLEAR 0603 SMD	25230
SLR-343MCT32 ROHM Semiconductor	LED GREEN CLEAR T-1 T/H	8806
SLR-342VRT32 ROHM Semiconductor	LED RED DIFFUSED T-1 T/H	348
SMLMN2WB1CW1 ROHM Semiconductor	LED WHITE 2012 SMD	1262

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