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

Part Number	Description / PDF	Quantity
LTL-57173HR Lite-On, Inc.	LED LIGHT BAR RECT 1X1 HE RED	2
LTL-533-11 Lite-On, Inc.	LED 5MM GREEN GRN DIFF TH	2037
LTL-523-11 Lite-On, Inc.	LED 5MM HI EFF RED TH	5000
LTA-1000E Lite-On, Inc.	LED LIGHT BAR RECT 1X10 RED/ORN	760
LTL-2755Y Lite-On, Inc.	LED LIGHT BAR RECT 1X1 YELLOW	0
LTL-2450Y Lite-On, Inc.	LED LIGHT BAR RECT 1X1 YELLOW	0
LTL-2300HR Lite-On, Inc.	LED LIGHT BAR RECT 1X1 HERED	0
LTL-2685HR Lite-On, Inc.	LED LIGHT BAR RECT 1X1 HE RED	0
LTL-2620HR Lite-On, Inc.	LED LIGHT BAR RECT 1X4 HE RED	0
LTA-1000HR Lite-On, Inc.	LED BAR GRAPH 10-SEGMENT RED	14377
LTL-2885G Lite-On, Inc.	LED LIGHT BAR RECT 1X1 GREEN	850
LTL-553-11 Lite-On, Inc.	LED 5MM YELLOW TH	3277
LTL-1BEHJ Lite-On, Inc.	LED CBI 3MM RED-ORN/GREEN DIFF	8083
LTA-1000G Lite-On, Inc.	LED BAR GRAPH 10-SEGMENT GREEN	7743
LTL-53173Y Lite-On, Inc.	LED LIGHT BAR RECT 1X1 YELLOW	0
LTA-1000Y Lite-On, Inc.	LED BAR GRAPH 10-SEGMENT YELLOW	209
LTL-2500G Lite-On, Inc.	LED LIGHT BAR RECT 1X1 GREEN	0
LTL-2785Y Lite-On, Inc.	LED LIGHT BAR RECT 1X1 YELLOW	0
LTL-2550G Lite-On, Inc.	LED LIGHT BAR RECT 1X1 GREEN	0
LTL-2820G Lite-On, Inc.	LED LIGHT BAR RECT 1X4 GREEN	1504

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