LEDs - Circuit Board Indicators, Arrays, Light Bars, Bar Graphs

Part Number	Description / PDF	Quantity
5690714400F Dialight	LED CBI 3MM BI-LEVEL Y/G,Y/G	301
5554001F Dialight	LED 2MM QUAD RED	1288
QLA764B-3Y QT Brightek	LED 3MM BI-LVL RA YELLOW DIFF	400
5642210813F Dialight	LED CBI 3MM 3X1 RED,RED,YLW	0
HLCP-J100 Broadcom	LED BAR GRAPH 10SEG RED	827
5513007004F Dialight	LED 3MM QUAD RED/GRN BICLR PCMNT	24
XEVG21D SunLED	3.6X6.1MM GREEN LIGHT BAR LED	15
5381H5 Visual Communications Company, LLC	LED GREEN T1-3/4 VERTICAL PCB	414
5306H7 Visual Communications Company, LLC	LED YELLOW T1-3/4 RT ANG PCB	1019
5640100777F Dialight	LED 3HI 3MM ORANGE PC MNT	1005
A01BE NKK Switches	INDICATOR LOPRO STR BRKT YEL LED	10
5615501090F Dialight	LED 5MM VERT SUP CLEAR RED PC MT	0
593353535313F Dialight	LED PRISM	1684
WP934MD/LILGD Kingbright	REDGREEN BI-LEVEL LED INDICATOR	13773
5608F5 Visual Communications Company, LLC	LED GREEN T1 RIGHT ANGLE PCB	2331
WP934EW/GD5V Kingbright	GREEN RIGHT ANGLE LED INDICATOR	7171
5640700440F Dialight	LED CBI 3MM 3X1 Y/G,Y/G,BLANK	0
5913001007SF Dialight	LED PRISM 3MM RED,GRN SILIC SMD	0
5501004F Dialight	LED 5MM VERTICAL BLUE WTR CLEAR	424
AA3528AVU/AQBS/D Kingbright	LED 3MM 1-LEVEL BLUE SMD	0

LEDs - Circuit Board Indicators, Arrays, Light Bars, Bar Graphs

1. Overview

Light Emitting Diodes (LEDs) are semiconductor devices that convert electrical energy into light through electroluminescence. This product category includes indicators, arrays, light bars, and bar graphs designed for circuit board integration. LEDs serve critical roles in modern electronics for status indication, data visualization, and illumination. Their advantages include low power consumption, long lifespan, and compact form factors.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
Indicators	Single/dual-color point-source lighting for status indication	Power switches, network routers, medical device panels
Arrays	Matrix configurations for alphanumeric/symbol display	Seven-segment displays, dot matrix modules
Light Bars	Linear arrangements for directional lighting/brightness zones	Audio level meters, industrial control panels
Bar Graphs	Segmented columns for quantitative visual representation	Battery level indicators, sensor data visualization

3. Structure and Components

Typical LED components include:

Die: Gallium Nitride (GaN) or Indium Gallium Aluminum Phosphide (InGaAlP) semiconductor chips
Substrate: FR4 or metal-core PCB for thermal management
Encapsulation: Epoxy resin with diffused/optical lens structures
Driver Circuitry: Current-limiting resistors or PWM control ICs

4. Key Technical Specifications

Parameter	Description	Importance
Luminous Intensity	0.1-100 cd/m range	Determines visibility in various lighting conditions
Wavelength	400-700 nm (visible spectrum)	Defines color output accuracy
Forward Current	2-30 mA typical	Impacts brightness and longevity
Viewing Angle	5-120 depending on lens design	Dictates light distribution pattern
MTBF	50,000-100,000 hours	System reliability prediction

5. Application Fields

Key industries include:

Consumer Electronics: Smartphones, laptops, home appliances
Industrial Automation: PLC status indicators, HMI panels
Automotive: Dashboard lighting, warning indicators
Medical Equipment: Diagnostic status visualization

6. Leading Manufacturers and Products

Manufacturer	Product Series	Key Features
Cree	XLamp XR	High-brightness automotive indicators
OSRAM	LED Line	Programmable RGB light bars
Nichia	NSPWR70CSS	Ultra-compact bar graph displays
Everlight	DLW-5xxx	Waterproof array modules

7. Selection Recommendations

Key considerations:

Environmental Conditions: Temperature (-40 to +85 C operational range)
Optical Requirements: Color consistency (CIE 1931 standard)
Electrical Compatibility: Driver circuit matching
Form Factor: 0402-5050 package size constraints
Cost Optimization: Trade-off between performance and budget

Industry Trend Analysis

Current trends show:

Micronization: Development of 0201 package formats
Smart Integration: Embedded ICs for addressable lighting
Energy Efficiency: Sub-1mA operational current devices
Automotive Growth: HUD and LiDAR indicator applications
Medical Advancements: UV/IR spectrum specialized indicators