LED Indication - Discrete

Part Number	Description / PDF	Quantity
SML812BCTT86 ROHM Semiconductor	LED BLUE CLEAR 1305 SMD	7279
SMLA12WBC7W1KQ ROHM Semiconductor	LED WHITE DIFFUSED 1611 SMD R/A	5564
SML-020MDTT86 ROHM Semiconductor	LED GREEN/ORANGE CLEAR 1210 SMD	0
SLR-56VR3F ROHM Semiconductor	LED RED DIFFUSED T-1 3/4 T/H	15486
SML012ECTT86 ROHM Semiconductor	LED GREEN CLEAR 3020 SMD	0
SLR-342VR3F ROHM Semiconductor	LED RED DIFFUSED T-1 T/H	49240
SLI-343URC3F ROHM Semiconductor	LED RED DIFFUSED T-1 T/H	974
SML-A12WTT86J ROHM Semiconductor	LED YELLOW CLEAR 1611 SMD R/A	0
SLR-322MG3F ROHM Semiconductor	LED GREEN DIFFUSED T-1 T/H	914
SML-Z14VTT86C ROHM Semiconductor	LED RED CLEAR 3528 SMD	2003
SLR343BC7T3F ROHM Semiconductor	LED BLUE CLEAR T-1 T/H	4058
SLR-325VRT31 ROHM Semiconductor	LED RED DIFFUSED T-1 T/H	0
SML-012M8TT86 ROHM Semiconductor	LED GREEN CLEAR 3020 SMD	4650
SML-020MLTT87 ROHM Semiconductor	LED GREEN/RED CLEAR 1210 SMD	2000
SMLE12WBC7W1 ROHM Semiconductor	LED WHITE DIFFUSED 0603 SMD	28801
SMLMN2BCTT86C ROHM Semiconductor	LED BLUE CLEAR 2012 SMD	6826
SLA580ECT3F ROHM Semiconductor	LED BLUE-GREEN CLEAR T-1 3/4 T/H	3354
SLR-322MC3F ROHM Semiconductor	LED GREEN CLEAR T-1 T/H	652
SML-H12U8TT86 ROHM Semiconductor	LED RED CLEAR 0805 SMD	0
SMLP36RGB2W3 ROHM Semiconductor	LED RGB DIFFUSED 1510 SMD	5413

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